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Blog URL: "https://www.hackerearth.com/blog/winning-tips-machine-learning-competitions-kazanova-current-kaggle-3"

Introduction

Machine Learning is tricky. No matter how many books you read, tutorials you finish or problems you solve, there will always be a data set you might come across where you get clueless. Specially, when you are in your early days of Machine Learning. Isn’t it ?

In this blog post, you’ll learn some essential tips on building machine learning models which most people learn with experience.These tips were shared by Marios Michailidis(a.k.a Kazanova), Kaggle Grandmaster, Current Rank #3 in a webinar happened on 5th March 2016. The webinar had three aspects:

  1. VideoWatch Here.
  2. Slides – Slides used in the video were shared by Marios. Indeed, an enriching compilation of machine learning knowledge. Below are the slides.
  3. Q & As – This blog enlists all the questions asked by participants at webinar.

The key to succeeding in competitions is perseverance. Marios said, ‘I won my first competition (Acquired valued shoppers challenge) and entered kaggle’s top 20 after a year of continued participation on 4 GB RAM laptop (i3)’.Were you planning to give up ?

While reading Q & As, if you have any questions, please feel free to drop them in comments!

Questions & Answers

1. What are the steps you follow for solving a ML problem? Please describe from scratch.

Following are the steps I undertake while solving any ML problem:

  1. Understand the data – After you download the data, start exploring features. Look at data types. Check variable classes. Create some univariate – bivariate plots to understand the nature of variables.
  2. Understand the metric to optimize – Every problem comes with a unique evaluation metric. It’s imperative for you to understand it, specially how does it change with target variable.
  3. Decide cross validation strategy – To avoid overfitting, make sure you’ve set up a cross validation strategy in early stages. A nice CV strategy willhelp you get reliable score on leaderboard.
  4. Start hyper parameter tuning– Once CV is at place, try improving model’s accuracy using hyper parameter tuning. It further includes the following steps:
    • Data transformations: It involve steps like scaling, removing outliers, treating null values, transform categorical variables, do feature selections, create interactions etc.
    • Choosing algorithms and tuning their hyper parameters: Try multiple algorithms to understand how model performance changes.
    • Saving results: From all the models trained above, make sure you save their predictions. They will be useful for ensembling.
    • Combining models: At last, ensemble the models, possibly on multiple levels. Make sure the models are correlated for best results.

Machine learning challenge, ML challenge

2. What are the model selection and data manipulation techniques you follow to solve a problem?

Generally, I try (almost) everything for most problems. In principle for:

  • Time series: I use GARCH, ARCH, regression, ARIMA models etc.
  • Image classification: I use deep learning (convolutional nets) in python.
  • Sound Classification :Common neural networks
  • High cardinality categorical (like text data): I use linear models, FTRL, Vowpal wabbit, LibFFM, libFM, SVD etc.

For everything else,I use Gradient boosting machines (like XGBoost and LightGBM) and deep learning (like keras, Lasagne, caffe, Cxxnet). I decide what model to keep/drop in Meta modelling with feature selection techniques.Some of the feature selection techniques I use includes:

  • Forward (cv or not) – Start from null model. Add one feature at a time and check CV accuracy. If it improves keep the variable, else discard.
  • Backward (cv or not) – Start from full model and remove variables one by one. It CV accuracy improves by removing any variable, discard it.
  • Mixed (or stepwise) – Use a mix of above to techniques.
  • Permutations
  • Using feature importance – Use random forest, gbm, xgboost feature selection feature.
  • Apply some stats’ logic such as chi-square test, anova.

Data manipulation could be different for every problem :

  • Time series : You can calculate moving averages, derivatives. Remove outliers.
  • Text : Useful techniques are tfidf, countvectorizers, word2vec, svd (dimensionality reduction). Stemming, spell checking, sparse matrices, likelihood encoding, one hot encoding (or dummies), hashing.
  • Image classification: Here you can do scaling, resizing, removing noise (smoothening), annotating etc
  • Sounds : Calculate Furrier Transforms , MFCC (Mel frequency cepstral coefficients), Low pass filters etc
  • Everything else : Univariate feature transformations (like log +1 for numerical data), feature selections, treating null values, removing outliers, converting categorical variables to numeric.

3. Can you elaborate cross validation strategy?

Cross validation means that from my main set, I create RANDOMLY 2 sets. I built (train) my algorithm with the first one (let’s call it training set) and score the other (let’s call it validation set). I repeat this process multiple times and always check how my model performs on the test set in respect to the metric I want to optimize.

The process may look like:

  • For 10 (you choose how many X) times
  • Split the set in training (50%-90% of the original data)
  • And validation (50%-10% of the original data)
  • Then fit the algorithm on the training set
  • Score the validation set.
  • Save the result of that scoring in respect to the chosen metric.
  • Calculate the average of these 10 (X) times. That how much you expect this score in real life and is generally a good estimate.
  • Remember to use a SEED to be able to replicate these X splits

Other things to consider is Kfold and stratified KFold . Read here.For time sensitive data, make certain you always the rule of having past predicting future when testing’s.

4. Can you please explain sometechniques usedfor cross validation?

  • Kfold
  • Stratified Kfold
  • Random X% split
  • Time based split
  • For large data, just one validation set could suffice (like 20% of the data – you don’t need to do multiple times).

5. How did you improve your skills in machine learning? What training strategy did you use?

I did a mix of stuff in 2. Plus a lot of self-research. Alongside,programming and software (in java) and A LOT of Kaggling ☺

6. Which are the most useful python libraries for a data scientist ?

Below are some libraries which I find most useful in solving problems:

  • Data Manipulation
    • Numpy
    • Scipy
    • Pandas
  • Data Visualization
    • Matplotlib
  • Machine Learning / Deep Learning
    • Xgboost
    • Keras
    • Nolearn
    • Gensim
    • Scikit image
  • Natural Language Processing
    • NLTK

7. What are useful ML techniques / strategies to impute missing values or predict categorical label when all the variables are categorical in nature.

Imputing missing values is a critical step. Sometimes you may find a trend in missing values. Below are some techniques I use:

  • Use mean, mode, median for imputation
  • Use a value outside the range of the normal values for a variable. like -1 ,or -9999 etc.
  • Replace witha likelihood – e.g. something that relates to the target variable.
  • Replace with something which makes sense. For example: sometimes null may mean zero
    • Try to predict missing values based on subsets of know values
    • You may consider removing rows with many null values

8. Can you elaborate what kind of hardware investment you have done i.e. your own PC/GPU setup for Deep learning related tasks? Or were you using more cloud based GPU services?

I won my first competition (Acquired valued shoppers challenge) and entered kaggle’s top 20 after a year of continued participation on 4 GB RAM laptop (i3). I was using mostly self-made solutions up to this point (in Java). That competition it had something like 300,000,000 rows of data of transactions you had to aggregate so I had to parse the data and be smart to keep memory usage at a minimum.

However since then I made some good investments to become Rank #1. Now, I have access to linux servers of 32 cores and 256 GBM of RAM. I also have a geforce 670 machine (for deep learning /gpu tasks) . Also, I use mostly Python now. You can consider Amazon’s AWS too, however this is mostly if you are really interested in getting to the top, because the cost may be high if you use it a lot.

9. Do you use high performing machine like GPU. or for example do you do thing like grid search for parameters for random forest(say), which takes lot of time, so which machine do you use?

I use GPUs (not very fast, like a geforce 670) for every deep learning training model. I have to state that for deep learning GPU is a MUST. Training neural nets on CPUs takes ages, while a mediocre GPU can make a simple nn (e.g deep learning) 50-70 times faster. I don’t like grid search. I do this fairly manually. I think in the beginning it might be slow, but after a while you can get to decent solutions with the first set of parameters! That is because you can sort of learn which parameters are best for each problem and you get to know the algorithms better this way.

10. How do people built around 80+ models is it by changing the hyper parameter tuning ?

It takes time. Some people do it differently. I have some sets of params that worked in the past and I initialize with these values and then I start adjusting them based on the problem at hand. Obviously you need to forcefully explore more areas (of hyper params in order to know how they work) and enrich this bank of past successful hyper parameter combinations for each model. You should consider what others are doing too. There is NO only 1 optimal set of hyper params. It is possible you get a similar score with a completely different set of params than the one you have.

11. How does one improve their kaggle rank? Sometimes I feel hopeless while working on any competition.

It’s not an overnight process. Improvement on kaggle or anywhere happens with time. There are no shortcuts. You need to just keep doing things. Below are some of the my recommendations:

  • Learn better programming: Learn python if you know R.
  • Keep learning tools (listed below)
  • Read some books.
  • Play in ‘knowledge’ competitions
  • See what the others are doing in kernels or in past competitions look for the ‘winning solution sections’
  • Team up with more experience users, but you need to improve your ranking slightly before this happens
  • Create a code bank
  • Play … a lot!

12. Can you tellus about some usefultools used in machine learning ?

Below is the list of my favourite tools:

13. How to start with machine learning?

I like these slides from the university of utah in terms of understanding some basic algorithms and concepts about machine learning. This book for python. I like this book too. Don’t forget to follow the wonderful scikit learn documentation. Use jupyter notebook from anaconda.

You can find many good links that have helped me in kaggle here. Look at ‘How Did you Get Better at Kaggle’

In addition, you should do Andrew Ng’s machine learning course. Alongside, you can follow some good blogs such as mlwave, fastml, analyticsvidhya. But the best way is to get your hands dirty. do some kaggle! tackle competitions that have the “knowledge” flag first and then start tackling some of the main ones. Try to tackle some older ones too.

14. What techniques perform best on large data sets on Kaggle and in general ? How to tackle memory issues ?

Big data sets with high cardinality can be tackled well with linearmodels. Consider sparse models. Tools like vowpal wabbit. FTRL , libfm, libffm, liblinear are good tools matrices in python (things like csr matrices). Consider ensembling (like combining) models trained on smaller parts of the data.

15. What is the SDLC (Sofware Development Life Cycle) of projects involving Machine Learning ?

  • Give a walk-through on an industrial project and steps involved, so that we can get an idea how they are used. Basically, I am in learning phase and would expect to get an industry level exposure.
  • Business questions: How to recommend products online to increase purchases.
  • Translate this into an ml problem. Try to predict what the customer will buy in the future given some data available at the time the customer is likely to make the click/purchase, given some historical exposures to recommendations
  • Establish a test /validation framework.
  • Find best solutions to predict best what customer chose.
  • Consider time/cost efficiency as well as performance
  • Export model parameters/pipeline settings
  • Apply these in an online environment. Expose some customers but NOT all. Keep test and control groups
  • Assess how well the algorithm is doing and make adjustments over time.

16. Which is your favorite machine learning algorithm?

It has to be Gradient Boosted Trees. All may be good though in different tasks.

15. Which language is best for deep learning, R or Python?

I prefer Python. I think it is more program-ish . R is good too.

16. What would someone trying to switch careers in data science need to gain aside from technical skills? As I don’t have a developer background would personal projects be the best way to showcase my knowledge?

The ability to translate business problems to machine learning, and transforming them into solvable problems.

17. Do you agree with the statement that in general feature engineering (so exploring and recombining predictors) is more efficient than improving predictive models to increase accuracy?

In principle – Yes. I think model diversity is better than having a few really strong models. But it depends on the problem.

18. Are the skills required to get to the leaderboard top on Kaggle also those you need for your day-to day job as a data scientist? Or do they intersect or are somewhat different? Can I make the idea of what a data scientist’s job is based on Kaggle competitions? And if a person does well on Kaggle does it follow that she will be a successful data scientist in her career ?

There is some percentage of overlap especially when it comes to making predictive models, working with data through python/R and creating reports and visualizations. What Kaggle does not offer (but you can get some idea) is:

  • How to translate a business question to a modelling (possibly supervised) problem
  • How to monitor models past their deployment
  • How to explain (many times) difficult concepts to stake holders.
  • I think there is always room for a good kaggler in the industry world. It is just that data science can have many possible routes. It may be for example that not everyone tends to be entrepreneurial in their work or gets to be very client facing, but rather solving very particular (technical) tasks.

19. Which machine learning concepts are must to have to perform well in a kaggle competition?

  • Data interrogation/exploration
  • Data transformation – pre-processing
  • Hands on knowledge of tools
  • Familiarity with metrics and optimization
  • Cross Validation
  • Model Tuning
  • Ensembling

20. How do you see the future of data scientist job? Is automation going to kill this job?

No – I don’t think so. This is what they used to say about automation through computing. But ended up requiring a lot of developers to get the job done! It may be possible that data scientists focus on softer tasks over time like translating business questions to ml problems and generally becoming shepherds’ of the process – as in managers/supervisors of the modelling process.

21. How to use ensemble modelling in R and Python to increase the accuracy of prediction. Please quote some real life examples?

You can see my github script as I explain different Machine leaning methods based on a Kaggle competition. Also, check this ensembling guide.

22. What is best python deep learning libraries or framework for text analysis?

I like Keras (because now supports sparse data), Gensim (for word 2 vec).

23. How valuable is the knowledge gained through these competitions in real life? Most often I see competitions won by ensembling many #s of models … is this the case in real life production systems? Or are interpretable models more valuable than these monster ensembles in real productions systems?

In some cases yes – being interpretable or fast (or memory efficient) is more important. Butthis is likely to change over time as people will be less afraid of black box solutions and focus on accuracy.

24. Should I worry about learning about the internals about the machine learning algorithms or just go ahead and try to form an understanding of the algorithms and use them (in competitions and to solve real life business problems) ?

You don’t need the internals. I don’t know all the internals. It is good if you do, but you don’t need to. Also there are new stuff coming out every day – sometimes is tough to keep track of it. That is why you should focus on the decent usage of any algorithm rather than over investing in one.

25. Which are the best machine learning techniques for imbalanced data?

I don’t do a special treatment here. I know people find that strange. This comes down to optimizing the right metric (for me). It is tough to explain in a few lines. There are many techniques for sampling, but I never had to use. Some people are using Smote. I don’t see value in trying to change the principal distribution of your target variable. You just end up with augmented or altered principal odds. If you really want a cut-off to decide on whether you should act or not – you may set it based on the principal odds.

I may not be the best person to answer this. I personally have never found it (significantly) useful to change the distribution of the target variable or the perception of the odds in the target variable. It may just be that other algorithms are better than others when dealing with this task (for example tree-based ones should be able to handle this).

26. Typically, marketing research problems have been mostly handled using standard regression techniques – linear and logistic regression, clustering, factor analyses, etc…My question is how useful are machine learning and deep learning techniques/algorithms useful to marketing research or business problems? For example how useful is say interpreting the output of a neural network to clients? Are there any resources you can refer to?

They are useful in the sense that you can most probably improve accuracy (in predicting let’s say marketing response) versus linear models (like regressions). Interpreting the output is hard and in my opinion it should not be necessary as we are generally moving towards more black box and complicated solutions.

As a data scientist you should put effort in making certain that you have a way to test how good your results are on some unobserved (test) data rather trying to understand why you get the type of predictions you are getting. I do think that decompressing information from complicating models is a nice topic (and valid for research), but I don’t see it as necessary.

On the other hand, companies, people, data scientists, statisticians and generally anybody who could be classified as a ‘data science player’ needs to get educated to accept black box solutions as perfectly normal. This may take a while, so it may be good to run some regressions along with any other modelling you are doing and generally try to provide explanatory graphs and summarized information to make a case for why your models perform as such.

27. How to build teams for collaboration on Kaggle ?

You can ask in forums (i.e in kaggle) . This may take a few competitions though before ’people can trust you’. Reason being, they are afraid of duplicate accounts (which violate competition rules), so people would prefer somebody who is proven to play fair. Assuming some time has passed, you just need to think of people you would like play with, people you think you can learn from and generally people who are likely to take different approaches than you so you can leverage the benefits of diversity when combining methods.

28. I have gone through basic machine learning course(theoretical) . Now I am starting up my practical journey , you just recommended to go through sci-kit learn docs & now people are saying TENSORFLOW is the next scikit learn , so should I go through scikit or TF is a good choice ?

I don’t agree with this statement ‘people are saying TENSORFLOW is the next scikit learn’. Tensorflow is a framework to do well certain machine learning tasks (like for deep learning). I think you can learn both, but I would start with scikit. I personally don’t know TensorFlow , but I use tools that are based on tensor flow (for example Keras). I am lazy I guess!

29. The main challenge that I face in any competition is cleaning the data and making it usable for prediction models. How do you overcome it ?

Yeah. I join the club! After a while you will create pipelines that could handle this relatively quicker. However…you always need to spend time here.

30. How to compute big data without having powerful machine?

You should consider tools like vowpal wabbit and online solutions, where you parse everything line by line. You need to invest more in programming though.

31. What is Feature Engineering?

In short, feature engineering can be understood as:

  • Feature transformation (e.g. converting numerical or categorical variables to other types)
  • Feature selections
  • Exploiting feature interactions (like should I combine variable A with variable B?)
  • Treating null values
  • Treating outliers

32. Which maths skills are important in machine learning?

Some basic probabilities along with linear algebra (e.g. vectors). Then some stats help too. Like averages, frequency, standard deviation etc.

33. Can you share your previous solutions?

See some with code and some without (just general approach).

34. How long should it take for you to build your first machine learning predictor ?

Depends on the problem (size, complexity, number of features). You should not worry about the time. Generally in the beginning you might spend much time on things that could be considered much easier later on. You should not worry about the time as it may be different for each person, given the programming, background or other experience.

35. Are there any knowledge competitions that you can recommend where you are not necessarily competing on the level as Kaggle but building your skills?

From here, both titanic and digit recognizer are good competitions to start. Titanic is better because it assumes a flat file. Digit recognizer is for image classification so it might be more advanced.

36. What is your opinion about using Weka and/or R vs Python for learning machine learning?

I like Weka. It has a good documentation– especially if you want to learn the algorithms. However I have to admit that it is not as efficient as some of the R and Python implementations. It has good coverage though. Weka has some good visualizations too – especially for some tree-based algorithms. I would probably suggest you to focus on R and Python at first unless your background is strictly in Java.

Summary

In short, succeeding in machine learning competition is all about learning new things, spending a lot of time training, feature engineering and validating models. Alongside, interact with community on forums, read blogs and learn from approach of fellow competitors.

Success is imminent, given that if you keep trying. Cheers!

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How to Get Hiring Managers to Complete Scorecards

Meta title: How to get hiring managers to complete scorecards Meta description: How to get hiring managers to complete scorecards: the conversation, the timing, and the systems that actually move debrief compliance past 80%.

How to get hiring managers to complete scorecards: a recruiter's guide to the conversation that actually works

Getting hiring managers to complete scorecards is less a workflow problem than a negotiation problem. The recruiters who consistently pull scorecards on time have figured out how to make completion feel like the hiring manager's win — not the recruiter's chore. This guide is about the specific conversation, timing, and lightweight systems that move debrief compliance from "chased for three days" to "in the ATS before the next interview."

If you have ever sent the fourth "gentle nudge" on a Thursday afternoon, you already know the standard advice — "make it part of your process" — doesn't survive contact with a hiring manager whose sprint just slipped. What follows is a recruiter-to-recruiter playbook on how to get hiring managers to complete scorecards without becoming the person they mute in Slack.

Why hiring managers don't complete scorecards (be honest about the cause)

Scorecard non-compliance is almost never about laziness. In our experience running assessments and interview loops for hundreds of hiring teams, the pattern breaks down into four causes, roughly in this order:

  1. The scorecard asks the wrong questions. Fields like "Culture fit: 1–5" with no rubric are impossible to fill in without feeling either dishonest or exposed to a bias complaint. Hiring managers stall because the form itself is broken.
  2. The debrief window closed. By the time a hiring manager sits down on Friday, the Tuesday interview is a blur. They either fabricate a score or avoid the task.
  3. No one has explained what the scorecard is for. If the hiring manager thinks it's an HR compliance artifact, it goes to the bottom of the list. If they think it's how the panel calibrates on the next candidate, it doesn't.
  4. The recruiter is the only person following up. When escalation never happens, the deadline is fictional.

Naming the cause changes the intervention. A recruiter who chases harder solves none of these. A recruiter who fixes the rubric, shrinks the window, reframes the purpose, or builds an escalation path solves all of them.

The conversation that actually works before the interview

The single highest-leverage moment for scorecard completion is the intake conversation with the hiring manager before the first interview is scheduled — not the reminder afterward.

In that meeting, three things get agreed:

  • The rubric. What are we actually evaluating? Three to five competencies, each with a behavioral anchor. "System design at senior level" beats "technical strength." If the hiring manager can't articulate what "good" looks like, the scorecard will fail regardless of tooling.
  • The completion window. Scorecard due within 24 hours of the interview, no exceptions. This is the number to negotiate hard on. Anything longer than 24 hours correlates with lower quality and higher attrition of detail — the research on memory decay is well-established, and interview debriefs are no exception (see the classic work summarized in Kahneman and Klein, 2009, on expert judgment, foundational but still cited).
  • The escalation. "If a scorecard isn't in by end of day the following day, I'll ping you once. If it's not in 24 hours after that, I'll loop in [the hiring manager's manager or the VP of Engineering]." Say it out loud. Get the nod.

Recruiters often skip the third item because it feels aggressive. It isn't. It's the only thing that turns the deadline into a real one. The hiring manager who agrees to escalation up front rarely needs it invoked.

How to get hiring managers to complete scorecards after the interview (the 24-hour play)

Once the interview happens, the mechanics matter more than the reminders. Here is the sequence that works:

T+0 (immediately after the interview): Send a single Slack message with the scorecard link, the candidate's name, and the specific rubric competencies to score. Not a calendar invite. Not an email. A message they can act on from their phone between meetings.

T+4 hours: If not submitted, a second message. This one includes a one-line prompt: "Quick take — recommend/no recommend and one sentence on why. You can flesh out the rubric later." Lowering the bar to a directional answer often unblocks the full submission within the hour.

T+24 hours: If still not submitted, a call — not a Slack ping. Two minutes of "walk me through what you saw" and a recruiter typing the scorecard live. This is the least popular tactic among recruiters and the most effective. It costs 10 minutes. It closes the loop.

T+48 hours: Escalation, as agreed in the intake. Once. Publicly enough that the hiring manager remembers next time.

The recruiters who complain that they "can't get scorecards in" have almost always skipped step three. They pinged four times and never picked up the phone.

Redesign the scorecard so it can be completed in five minutes

If completion still lags after the conversation and timing fixes, the form itself is the problem. A scorecard that takes 20 minutes to fill in will not get filled in.

The scorecard that gets completed on time has:

  • Three to five competencies, not 12
  • A hire/no-hire recommendation at the top, not the bottom
  • Behavioral anchors under each rating so a "3" means the same thing to every interviewer
  • One free-text field for "what would change your mind"
  • No "culture fit" field without a defined rubric — it invites bias complaints and produces no signal

The trade-off is real: shorter scorecards capture less nuance, and some engineering managers will push back that a five-competency rubric can't evaluate a staff hire. Fair point. For senior roles, add one rubric-anchored deep-dive competency rather than expanding all fields. Depth in one place beats shallowness across ten.

For teams running high-volume technical hiring, structured skills-based assessments can carry more of the evaluative load upstream, so the post-interview scorecard becomes a calibration document rather than the primary signal. That shifts the hiring manager's job from "assess from scratch" to "confirm or challenge the rubric-applied score" — which is a five-minute task, not a twenty-minute one.

The systems layer: what to automate and what to leave human

Automation helps at the edges. It doesn't fix the underlying accountability problem.

What to automate: - Scorecard link delivery immediately post-interview (most ATS platforms — Greenhouse, Lever, Ashby — do this natively) - Reminder pings at T+4 and T+24 - Dashboard visibility for the hiring manager's manager showing outstanding scorecards by owner

What to keep human: - The intake conversation and the escalation agreement - The T+24 phone call - The quarterly review of which hiring managers consistently miss and why

An honest note: vendor dashboards that promise "automated scorecard compliance" tend to overstate what automation alone can do. Reminders don't create accountability; agreements do. The system exists to make the agreement visible, not to replace it.

For teams where interview volume is high enough that the debrief bottleneck is structural — 40+ interviews a week per hiring manager — the upstream fix is reducing the number of interviews that need debriefs, not automating the debriefs harder. Tools like OnScreen handle initial screening with a deterministic rubric so the hiring manager only debriefs candidates who cleared a structured filter. Fewer interviews, tighter scorecards, better calibration.

When to stop chasing and start reporting

Some hiring managers will never comply consistently. That is a data point, not a failure of the recruiter. Track scorecard completion rate by hiring manager as a quarterly metric and share it with the head of TA and the hiring manager's own leader.

The pattern usually breaks one of three ways: - The hiring manager improves once completion is visible - Their leader intervenes - The organization decides that hiring manager shouldn't be leading loops

All three are acceptable outcomes. What isn't acceptable is a recruiter absorbing the compliance cost silently, quarter after quarter, while candidates drop out because feedback took eight days.

Frequently asked questions

How long should hiring managers have to complete scorecards? 24 hours from the end of the interview. Beyond that, memory decay and calendar pressure combine to produce either fabricated scores or no scores at all. Some teams allow 48 hours for senior loops with system design components; that's the outer limit worth defending.

What's a realistic scorecard completion rate to target? Above 85% within the agreed window is achievable for teams that run the intake conversation and the T+24 phone call. Above 95% requires the escalation path to be real and occasionally invoked. Teams that report 100% compliance are usually not measuring accurately.

Should recruiters fill in scorecards on the hiring manager's behalf? Only during a live 10-minute call where the hiring manager talks and the recruiter types, with the hiring manager reviewing and submitting. Recruiters filling in scorecards asynchronously creates a defensibility problem — the person who observed the interview didn't document it — and undermines calibration.

How do you handle a hiring manager who refuses to use the rubric? Escalate once, then involve the head of TA. Rubric-free hiring is a defensibility risk under most fair-hiring frameworks and a calibration risk regardless of geography. This isn't a preference conversation; it's a program-level decision that a recruiter shouldn't be absorbing alone.

Does AI-generated candidate content change how scorecards should work? Yes. If your screening upstream doesn't verify that the candidate you interviewed is the candidate who did the take-home, the scorecard rubric should include a "consistency with prior signal" check. Interviewers flag divergence; recruiters investigate. This is one of the fastest-growing sources of late-stage no-hires we see.

Scorecard Completion Rate by Follow-Up Method
Source: Illustrative based on article claims

Key takeaways

  • The conversation before the first interview matters more than the reminder after — negotiate the rubric, the 24-hour window, and the escalation path up front.
  • Redesign scorecards to five minutes of work: three to five competencies, behavioral anchors, and a hire/no-hire at the top.
  • The T+24 phone call is the highest-leverage recruiter move for scorecard completion and the most consistently skipped.
  • Automation supports accountability but doesn't create it — agreements do.
  • Track completion rate by hiring manager quarterly; make the data visible to their leader.

Next steps

If scorecard compliance is downstream of an interview process that's simply running too hot, the upstream fix — structured screening that reduces the number of full-loop interviews — often does more than any workflow change. See how HackerEarth's assessment and interview platform helps hiring teams tighten the funnel before the debrief bottleneck starts.

How to Run a Hiring Intake Meeting That Builds a Rubric

Meta title: How to run a hiring intake meeting that builds a rubric Meta description: How to run a hiring intake meeting that produces a usable rubric, not a wish list. A 60-minute agenda, questions, and traps to avoid.

How to run a hiring intake meeting that produces a usable rubric, not a wish list

Most technical hiring fails at the intake meeting. The recruiter walks out with a job description, a list of "must-haves" that reads like a LinkedIn profile of the departing engineer, and no shared definition of what "strong" actually looks like. Learning how to run a hiring intake meeting that produces a usable rubric — not a wish list — is the highest-leverage thing a recruiter can do for a req.

This is not a strategy exercise. A hiring intake meeting done well takes 60 to 90 minutes, produces a scoring rubric two interviewers can apply to the same candidate and reach the same score, and gets calibrated once with a real resume before the first candidate hits the pipeline. Done badly, it produces a wish list, three months of misaligned debriefs, and a closed req that took twice as long as it should have.

Why most intake meetings produce wish lists, not rubrics

The default intake meeting is a monologue. The hiring manager describes an ideal person, the recruiter takes notes, and both parties leave feeling productive. Six weeks later, when a candidate scores 4/5 on "communication" from one interviewer and 2/5 from another, nobody can point to the source of the disagreement — because the source is that "communication" was never defined.

A wish list has three tells: it lists traits instead of behaviors, it does not distinguish must-haves from nice-to-haves, and it cannot be applied to two different candidates and produce comparable scores. A rubric fixes all three. Research from Google's Project Oxygen and the widely cited Kahneman, Rosenfield, Gandhi, and Blaser work on noise in judgment shows that structured evaluation criteria — not smarter interviewers — reduce inconsistency in hiring decisions.

The wish-list-to-rubric conversion is the actual work of the intake meeting. Everything else is paperwork.

What a usable rubric looks like

A usable rubric names 5 to 8 skills, defines each with an observable behavior, assigns a weight, and specifies which interview stage evaluates it. It fits on one page. Two interviewers reading it independently and scoring the same candidate should land within one point of each other on a 5-point scale.

Here is the minimum viable structure:

  • Skill: the capability being evaluated (e.g., "system design for services at 1K+ RPS")
  • Definition: one sentence describing what "meets bar" looks like in behavior, not adjectives
  • Weight: must-have, strong-preference, or nice-to-have
  • Stage: which interview round tests this — take-home, technical screen, panel, or hiring-manager round
  • Anchor examples: one description of a 3/5 answer and one of a 5/5 answer

If any row in the rubric cannot be filled in during the intake, that skill is not ready for evaluation. Either the hiring manager needs to think harder, or the skill needs to be cut.

Skills Listed vs. Skills That Belong in a Usable Rubric
Source: Illustrative based on article claims ('typically get 12 to 20 items')

The 60–90 minute intake agenda

Block a full 90 minutes. Meetings under 45 minutes almost always produce wish lists because there is no time to force the specificity conversation. The agenda below assumes the recruiter runs the meeting and the hiring manager is the primary participant, with an optional second interviewer joining for the last 30 minutes to pressure-test the rubric.

Minutes 0–10: Confirm the role's business context

Open with the question the hiring manager has probably not been asked: what does this person deliver in their first six months that makes the hire worth it? Not their responsibilities. Their outputs.

If the answer is vague ("contribute to the team," "help us scale"), keep pressing. A senior backend hire whose first six months are "ship the payments-service rewrite" is a different rubric from one whose first six months are "stabilize on-call and reduce SEV1s." Both are legitimate, but they weight skills differently.

Minutes 10–25: List the skills, then cut half

Ask the hiring manager to list every skill they think matters. Write them all down without pushback. You will typically get 12 to 20 items — some technical, some behavioral, some cultural, some that are actually the same thing renamed.

Then do the cut. Force the hiring manager to rank the list and mark only 5 to 8 as must-haves. The rest become nice-to-haves or get removed. A rubric with 15 must-haves is a rubric that will fail candidates for the wrong reasons and will not survive contact with a real pipeline.

This is the moment where hiring managers push back. A common objection: "But I need someone who has all of these." The honest answer: candidates with all of them exist but will not accept your offer at the salary band you have approved. Pick the 5 to 8 you will actually reject on.

Minutes 25–50: Convert each skill into observable behavior

For each must-have, ask three questions:

  1. What does a candidate say or do that shows they have this? Not "they seem confident" — "they explain the trade-off between eventual consistency and strong consistency without prompting."
  2. What would a candidate say or do that shows they don't? This one is harder and more useful. Interviewers score more reliably when they have a clear negative anchor.
  3. Which interview stage tests this? If the answer is "the whole loop," the skill is not defined tightly enough.

This is the section where 30 minutes disappears fast. It is also the section that determines whether the rubric is usable.

Minutes 50–70: Assign weights and design the loop

With the skills defined, decide what fails a candidate. If a staff engineer candidate is weak on system design, is that a rejection or a discussable? If they are weak on cross-team communication, same question.

Then map each skill to a stage. A useful test: no stage should evaluate more than three skills, and no skill should be evaluated by more than two stages. If your take-home is trying to evaluate coding quality, system design, testing discipline, and communication, it is evaluating none of them well.

For teams using platforms like HackerEarth Assessments or FaceCode, this is the point to decide which skills get an automated assessment and which need a live evaluator. Automated scoring is more consistent for well-defined coding skills; live evaluation is more useful for judgment, communication, and edge-case reasoning.

Minutes 70–90: Calibrate with a real resume

Pull a resume from a candidate the team has hired in the past 12 months, ideally one everyone agrees was a good hire. Score them against the rubric you just built.

If the rubric would have rejected the person you just agreed was a good hire, the rubric is wrong. Fix it now. If two people at the meeting score the same resume more than one point apart on any skill, the definition for that skill is not tight enough. Fix it now.

Then do the same exercise with a candidate who was hired and did not work out. The rubric should have flagged them.

The three questions that separate rubrics from wish lists

When you find yourself running low on time, these are the three questions that do the most work:

"What behavior would I see?" Cuts through trait language ("smart," "driven," "collaborative") and forces observable definitions.

"Would I reject a candidate for this alone?" Sorts must-haves from nice-to-haves faster than any ranking exercise.

"Where in the loop does this get tested?" Exposes skills the team wants to evaluate but has no mechanism for.

If the hiring manager cannot answer these three for a given skill, the skill does not belong in the rubric yet.

Where intake meetings still fail — and honest trade-offs

Even a well-run intake meeting has limits. Three failure modes we see repeatedly:

Rubric drift after six weeks. The rubric is calibrated once at intake and then never revisited. By the tenth candidate, each interviewer is applying their own drift. The fix is not more training — it is a 15-minute re-calibration meeting after the first three candidates go through the full loop.

The hiring manager wasn't the hiring manager. In matrixed orgs, the person in the intake meeting is not always the person who approves the offer. If the actual decision-maker is a skip-level, get them in the room or accept that the rubric will be relitigated.

The rubric is right and the pipeline is wrong. A tight rubric applied to a weak pipeline produces the same result as a loose rubric applied to a strong one — closed reqs and unhappy hiring managers. Rubric work does not fix sourcing.

A rubric is also not a substitute for judgment on senior hires. For staff-and-above roles, the rubric constrains the debrief; it does not make the decision. That is a feature, not a bug.

Frequently asked questions

How long should a hiring intake meeting actually take?

60 to 90 minutes for a new role. 30 minutes for a backfill on an existing rubric. Meetings under 45 minutes for new roles almost always skip the specificity conversation and produce wish lists. If the hiring manager cannot give you 90 minutes, split the intake into two 45-minute meetings — one for skills, one for weights and calibration.

Who needs to be in the intake meeting besides the recruiter and hiring manager?

At minimum, one senior interviewer who will be on the loop. They pressure-test the rubric in the last 30 minutes and catch skills the hiring manager over- or under-weights. For roles where the hiring manager does not have the deepest technical expertise (common for eng managers hiring specialists), a technical peer is not optional.

How does a rubric differ from a scorecard?

A rubric defines what is being evaluated and what "meets bar" looks like. A scorecard is the form an interviewer fills out during or after the round. The rubric is the source of truth; the scorecard is the artifact. Most teams have scorecards without rubrics, which is why their scorecards do not agree with each other.

What if the hiring manager refuses to cut skills from the must-have list?

Ask them to rank the list and identify the bottom three. Then ask: "If a candidate was strong on the top five and weak on these three, would you reject them?" If the answer is no, those three are nice-to-haves. If the answer is yes, you have a compensation-band problem, not a rubric problem.

Can AI interview tools replace the intake meeting?

No. AI interview tools like HackerEarth's OnScreen apply a rubric consistently across candidates, which is valuable. They do not build the rubric. The intake meeting is where humans decide what to evaluate; the tooling decides how consistently to evaluate it.

Key takeaways

  • A usable rubric has 5–8 must-haves with observable behaviors, weights, and stage assignments — not a wish list of traits.
  • Block 60–90 minutes for a new-role intake; anything shorter skips the specificity conversation that separates rubrics from wish lists.
  • Calibrate the rubric against a real past hire before the first candidate enters the pipeline — if the rubric would have rejected a known good hire, fix it.
  • Re-calibrate after the first three candidates go through the loop; rubric drift is the most common post-intake failure.
  • Rubrics constrain debriefs but do not replace judgment on senior hires — and no rubric fixes a weak pipeline.

See it in action

Want to see how a structured rubric translates into a repeatable assessment loop? Schedule a demo of HackerEarth Assessments and walk through a rubric-to-assessment mapping with our team.

AI Interviews in 2026: What Hiring Teams Should Know

Primary persona: Engineering Manager / Technical Hiring Lead Estimated read time: 6 minutes

AI Interviews in 2026: What Candidates and Hiring Teams See

[Featured image placeholder — flag for visual asset assignment before publication]

AI interviews in 2026 are structured, avatar-led technical conversations that evaluate candidates against a fixed rubric, typically conducted asynchronously without a live interviewer present. If you run engineering hiring, these sessions have likely already changed how your funnel operates. Most of the debate about them has focused on whether they work. The more useful question, now that they're deployed at scale, is what actually happens on both sides of the screen.

The category itself has matured quickly, and platforms in this space are now moving from pilot to production across enterprise deployments. The candidate experience has changed more than most hiring teams realize, and the operational gains are real but narrower than the vendor decks suggest. This piece is the practitioner's read on what the current generation looks like from both seats.

Line chart showing AI interview deployments shifting from mostly pilot programs in 2023 to majority production use by 2026
Chart: HackerEarth internal observation across enterprise deployments, 2023–2026.

What an AI Interview in 2026 Actually Looks Like

The current generation is not a chatbot with a scorecard. A candidate joins a video session with a lifelike avatar, verifies identity through a KYC-style check, and moves through a role-calibrated conversation that adapts based on their responses. Structured technical questions and follow-ups run inside the same session, with the AI probing shallow answers and applying the same rubric to every candidate.

Session length and format

Session lengths vary by customer configuration; teams commonly configure mid-level engineering rounds in the 45–75 minute range, with longer loops for senior roles. These are estimates based on how customers set up sessions rather than platform defaults.

Proctoring without the friction

Enterprise-grade proctoring monitors for irregularities without adding the intrusive lockdown steps — forced browser lockdowns, repeated identity re-checks mid-session — that plagued earlier remote-hiring tools.

Why the format feels different

What's different from 2023-era attempts: the interviews feel like conversations. That change alone has shifted the candidate reaction more than any feature list. For teams building their own evaluation frameworks, our guide to technical assessments for engineering hiring covers how to translate role expectations into scorable signals the AI can apply consistently.

The Candidate Experience of AI Interviews in 2026

Candidates report three things consistently: relief at the scheduling flexibility, discomfort at the loss of rapport, and a specific new anxiety about "performing for the machine."

Scheduling flexibility

The scheduling win is real. A candidate who applies at 11 PM on a Sunday can complete a full technical interview before Monday standup. For candidates weighing competing offers, that speed matters — hiring teams report that funnels still routed through a human recruiter's calendar lose top-of-funnel candidates to faster-moving competitors.

Rapport loss, by seniority

The rapport loss is also real, and it's not evenly distributed. Junior candidates and career-switchers — people who benefit from a warm human read of their potential — describe these sessions as harder to "recover" from a bad start. Senior engineers, who are usually being evaluated on specific technical judgment, report the opposite: they prefer the consistency and the absence of small talk.

The new "performing for the machine" anxiety

This anxiety is worth naming. Candidates ask whether looking away from the camera counts against them, whether the AI penalizes pauses for thought, whether their accent affects scoring. Most of these fears are unfounded on well-built platforms, but the fears themselves affect performance. Hiring teams that publish a plain-English candidate FAQ — what the AI evaluates, what it doesn't, how to appeal — see fewer drop-offs.

What AI Interviews in 2026 Change for Hiring Teams

The operational math shifts in four places:

Senior engineer time recovered

The most consistent gain we see: staff and principal engineers stop losing 5+ hours a week to first-round screens. That time returns to shipping, code review, and later-stage interviews where their judgment actually matters.

Time-to-hire compresses on the front end

As Pawan Kuldip, Head of Human Resources at Discover Dollar Inc., described in a HackerEarth customer story: "Roles that previously took much longer are now being closed within three to four weeks." Front-end compression is where the gain sits — offer negotiation and reference checks still take the same time they always did.

Proxy candidates and AI-generated CVs get filtered earlier

KYC verification at interview stage catches a category of fraud that resume screening cannot. This matters more in 2026 than it did in 2023, because the tooling on the candidate side has also improved. Talent leaders across the industry — including in SHRM's 2024 Talent Trends reporting — have raised AI-generated application materials as an area of concern.

Rubric drift narrows

When every candidate answers the same core questions with the same follow-up logic, calibration meetings shorten. Panels stop arguing about whether Candidate A "seemed sharper" than Candidate B; they argue about the score deltas. HackerEarth's skills-based hiring resources cover where rubric consistency changes panel dynamics.

None of this eliminates the human interview. It reallocates where humans spend their time.

Where AI Interviews in 2026 Still Fail

Three failure modes are worth being direct about.

Context-dependent judgment

The format evaluates what a candidate says and codes during the session. It does not evaluate whether the candidate would thrive on a team that's rebuilding its data platform under deadline pressure. That's still a human read, and hiring teams that skip the human read entirely consistently report degraded signal on cultural and contextual judgment.

Novel problem formats

Well-designed sessions handle standard technical rounds and system design conversations reliably. They struggle with unusual formats — extended pair-programming, ambiguous product-engineering problems, live debugging of a real codebase. FaceCode (HackerEarth's live technical interview platform) or a live human panel is the right tool for those rounds.

Bias profile is different, not absent

AI interviews are more consistent across candidates than human-led screens on rubric application, which reduces interviewer-mood and fatigue effects. They introduce their own patterns — some research and industry observation suggests speech-recognition accuracy can vary by accent, and rubric weights encode whoever wrote them. Any vendor claiming "zero bias" is selling you a story. The honest framing is that these systems trade one bias profile for another, and the new profile is auditable in ways the old one wasn't.

How Hiring Teams Should Structure AI Interviews in 2026

Use the format for the first technical round after resume triage, then route passing candidates into a human panel for later stages. Here's the workable pattern for most engineering funnels:

  1. Triage resumes using your standard filters.
  2. Deploy the AI interview as the first technical round. Session length is customer-configured; a common estimate is roughly 60 minutes for mid-level roles and up to 90 minutes for senior roles, though these should be tuned to your rubric rather than treated as fixed.
  3. Publish the rubric to candidates before they start — what's evaluated, how it's scored, what a passing threshold looks like.
  4. Route passing candidates into a human panel for final rounds where cultural judgment and team fit matter.
  5. Provide an appeal path so candidates can flag misreads and hiring teams can catch model drift.

Do not use this format as the only evaluation. Do not use it for hires above the director level, where the judgment call is almost entirely about context and trajectory.

Teams that follow this pattern report the operational gains without the candidate-experience backlash. Teams that try to fully automate the loop report the opposite.

Frequently Asked Questions

Are these interviews fair? More consistent across candidates than human-led screens on rubric application, less capable on context-dependent judgment. The fairness question is not "AI vs. human" — it's "which failure mode is more acceptable for this role." For high-volume screening where interviewer fatigue drives inconsistency, the AI-led format is often fairer. For senior hires where context matters, human panels are.

How long does a session take? Session lengths are customer-configured. Teams commonly set mid-level engineering rounds in the 45–75 minute range and up to around 90 minutes for senior roles. Shorter and the signal is thin; longer and candidate drop-off rises sharply.

Can candidates cheat? Less easily than on take-home assignments, more easily than on live human panels. KYC verification, proctoring, and adaptive follow-up questions catch most proxy candidates and copy-paste attempts. Determined cheaters can still find gaps — no interview format is fraud-proof.

Do candidates dislike them? Reactions split by seniority and career stage. Senior engineers generally prefer them for the scheduling flexibility and consistency. Junior candidates and career-switchers report more discomfort. Publishing what the AI evaluates and offering an appeal path reduces the negative reaction significantly.

Should the format replace human interviews entirely? No. The right pattern is AI for first-round technical screening, human panels for later rounds.

What scale can a modern AI interview platform handle? Scale is where the 2026 generation separates from earlier tools. HackerEarth has observed enterprise customers using OnScreen to screen thousands of candidates in a single weekend — in one on-file case, more than 2,000 — a throughput profile that was not achievable with the 2023-era chatbot tooling. This is a documented instance rather than a guaranteed benchmark, but it changes how you plan hiring events, campus drives, and reduction-in-force backfill windows.

Bar chart showing senior engineers reporting higher preference for AI interviews while junior candidates and career-switchers report greater discomfort
Chart: HackerEarth internal observation of candidate sentiment across enterprise deployments.

Key Takeaways

  • AI interviews in 2026 are structured, avatar-led sessions with adaptive follow-ups and integrated identity verification — not chatbots.
  • The biggest operational gain is senior engineer time recovered from first-round screens, not raw time-to-hire reduction.
  • Candidate reactions split by seniority: senior engineers prefer these sessions, junior candidates struggle more.
  • The bias profile shifts rather than disappears; the new profile is auditable, but "zero bias" claims are not credible.
  • The strategic implication for hiring leaders: the AI-led first round is not a labor-saving swap for a human screen — it changes where in the funnel your most expensive engineers spend judgment, and your rubric design becomes the highest-leverage lever in the whole process.

Cut Senior Engineer Screening Time on Your Next Requisition

If your staff and principal engineers are losing hours each week to first-round screens, book a walkthrough of HackerEarth OnScreen to see how it handles a live requisition on your funnel — from resume triage through to a scored, human-ready shortlist.


Editorial notes for pre-publication review: - Confirm final word count and update displayed read time to 7 minutes if word count exceeds 1,750. - Confirm Pawan Kuldip's canonical title ("Head of Human Resources, Discover Dollar Inc.") and replace the /customers/ index link with the named case study URL before publication. - Confirm the specific SHRM 2024 Talent Trends report URL and characterization ("area of concern") against source language; if the direct URL cannot be sourced, retain as an unlinked inline reference as shown. - Confirm with product team whether OnScreen's in-session coding evaluation is a released capability; text above has been adjusted to reference structured technical rounds without asserting an embedded live code editor with auto-evaluation. - Confirm session-length ranges (45–75 min mid-level, up to ~90 min senior) with product team; currently framed as customer-configured estimates. - Competitor names (HireVue, Karat, Metaview) have been removed from body content pending Brand Guardian approval per competitors.md. - Replace remaining internal link anchors with named case study / resource URLs once available.

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