Reddit Software Engineer Interview Questions
The questions to prepare for a Reddit Software Engineer interview. Questions from real interview reports rank first. Updated weekly.
Sort Reddit chat messages by stream and merge overlapping or consecutive time intervals in O(n log n) time.
RedditFind the lowest common ancestor of two nodes in a binary search tree using BST ordering.
RedditDescribe how you handled a disagreement with an engineer or safety expert when the decision involved delivery pressure and safety tradeoffs.
RedditExplain how you communicate scope, timing, and quality trade-offs when demand exceeds available engineering capacity.
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Design a real-time event pipeline that can handle millions of events per second with sub-second latency.
RedditDesign a shared feature store for training and low-latency inference across many ML systems with strict freshness and consistency needs.
RedditAssesses your data manipulation skills and ability to implement correct filtering.
RedditUse CTEs, joins, and date filtering to calculate 30-day retention by signup cohort from login and feature usage data.
Curefit
ReachMobi
IndeedCompute median post scores per active Reddit community using a CTE, join, filtering, and percentile_cont.
RedditUse CTEs, aggregation, and a window function to find last week's top advertiser and its daily revenue.
RedditAssesses web security understanding and defenses against CSRF attacks.
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