Katkat

Company

Exa interview questions

2 practice questions in the style of Exa's interviews, covering Machine Learning, Statistics & Math.

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Exa interview questions by the numbers

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Katkat has 2 Exa interview questions. The largest topics are Machine Learning (50%) and Statistics & Math (50%). By difficulty: 100% hard. The most common round is Technical Screen (100%).

Topics

Difficulty

  • Hard100% · 2

Interview rounds

  • Technical Screen100% · 2

Roles

  • Machine Learning Engineer100% · 2

Showing 1–2 of 2 results

  • Debug a PyTorch Contrastive LossHard

    Repair a PyTorch contrastive loss whose matrix multiplication contracts incompatible dimensions instead of producing pairwise scores. Validate aligned rank-two tensors and temperature, create the correct batch-by-batch logits, preserve gradients, and handle low-precision numerical stability.

    ExaMachine Learning EngineerMachine LearningTechnical Screen
  • Design a Streaming Percentile EstimatorHard

    Design a streaming percentile estimator without storing every observation, and define rank error precisely. Compare a deterministic single-stream summary with t-digest-style centroids across memory, update cost, duplicates, skew, tail accuracy, and distributed merge limitations.

    ExaMachine Learning EngineerStatistics & MathTechnical Screen

Exa interview experiences

All 1 →
  • Two Phone Screens, One 40-Minute t-digest DerivationExa · Research Engineer · Technical Screen · Apr 2026

    Haven't seen anyone share about this company on the forum, so let me be the first to post. Research Engineer — two phone screens total. Round 1: Mostly a PyTorch contrastive loss debugging exercise. Basically just fixing some matmul shape mismatches. Once I got it working, there were no more issues. The interviewer was a young guy, really nice, and he even guided me toward the right direction. Ac…

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