Reddit Data Engineer Interview Questions
The questions to prepare for a Reddit Data Engineer interview. Questions from real interview reports rank first. Updated weekly.
Use a queue to enforce a sliding-window client-side API rate limiter over request timestamps.
RedditUse Kadane's algorithm to find the contiguous subarray with the largest sum in linear time.
RedditImplement a set-like structure using an array and hash map to support insert, delete, and random access in average O(1) time.
RedditUse CTEs, aggregation, and a window function to find last week's top advertiser and its daily revenue.
RedditTests dimensional modeling ability for analytics on ad engagement data at scale.
RedditCompute median post scores per active Reddit community using a CTE, join, filtering, and percentile_cont.
RedditUse CTEs, joins, and date filtering to calculate 30-day retention by signup cohort from login and feature usage data.
Curefit
ReachMobi
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Tests strategies for correctness and idempotency with late data in batch pipelines.
RedditTests deduplication approaches for streaming systems with ordering and idempotency concerns.
RedditTests end-to-end streaming pipeline design for low-latency analytics and serving.
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