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

Preparation Strategy

In this final part of the ML algorithm coding interview section, we shift focus to preparation strategy. The goal is to build muscle memory, deepen our understanding, and simulate real interview pressure before the actual interview day.

  • We should implement key algorithms ahead of time and store them in a personal repo—don’t wait until the interview to figure them out.
  • Using toy datasets helps us quickly verify correctness and develop intuition for how outputs should behave.
  • We need to time ourselves, practicing full implementations within a 45-minute window to build speed and realism under pressure.
  • Studying the underlying math—like gradient descent, entropy, and loss functions—enables us to debug faster and explain our logic clearly.
  • Finally, we should review common optimizations, so even if we don’t implement them, we can speak to how we’d improve runtime or memory use.

By treating preparation like athletic training—intentional, timed, and iterative—we give ourselves the best shot at performing with confidence and depth in the real interview.

If you want to learn even more from Yayun: