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Yayun Jin, Ph.D.ML Engineer at Reddit | Ex-Microsoft & Workday | Mentoring 200+ Engineers into ML Roles

Round Structure

In this section, we dive into what makes the ML algorithm coding interview distinct from traditional coding rounds. It’s a focused, high-pressure test of both our theoretical depth and practical coding ability.

  • We’ll be asked to implement ML algorithms from scratch—no scikit-learn, no TensorFlow—just raw code.
  • This round tests both our understanding of the algorithm’s inner workings and our ability to code it cleanly and efficiently.
  • With only 45–60 minutes, we’re expected to focus on core logic and code structure, not perfection or full library-level implementations.
  • The scope is typically limited to common algorithms like linear regression, logistic regression, or k-means—so it's highly trainable.
  • With preparation, we can excel by knowing the key steps, math, and edge cases behind each algorithm and practicing how to express them in code.

If you want to learn even more from Yayun: