Reddit Machine Learning Engineer Interview Questions

The questions to prepare for a Reddit Machine Learning Engineer interview. Questions from real interview reports rank first. Updated daily.

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System DesignStart here. 6 questions · ~49 min

Design the ML system that ranks a Reddit-style home feed at scale with retrieval, ranking, and re-ranking.

Design a Personalized Notification RankerMedium

Design a personalized notification system that selects, ranks, and delivers the right pushes while controlling spam and latency.

class structurenotification systemscalability

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Coding7 questions · ~57 min

Evaluates understanding of hash functions and collision behavior in hash tables.

Sports Scoring System ClassMedium

Tests ability to design and implement clean OOP code for a scoring domain.

python

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Machine Learning8 questions · ~65 min

Turning Data into End-to-End MLHard

Evaluates ability to implement an end-to-end ML workflow from features to metrics.

Build an ML Model in 45 MinutesMedium

Assesses speed and effectiveness in implementing an ML solution under time pressure.

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Behavioral & Leadership10 questions · ~82 min

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