Substack Software Engineer Interview Questions
The questions to prepare for a Substack Software Engineer interview. Questions from real interview reports rank first. Updated weekly.
Implement Substack's in-memory key value store with separate chaining for average O(1) updates, lookups, and deletes.
SubstackTests ability to design efficient data structures for range operations.
SubstackTests ability to implement efficient range update and query data structures.
SubstackEvaluates system design trade-offs for throughput, latency, and reliability.
SubstackEvaluates ability to improve performance using caching strategies and precomputation.
SubstackEvaluates design decisions for scalability, latency, and event handling under load.
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Assesses understanding of React component architecture and lifecycle trade-offs.
SubstackTests ability to model subscription state transitions and data integrity in SQL.
SubstackFind the top 3 users by completed transaction volume in the last 30 days using joins and aggregation.
Remitly
Current (NY)
CryptoCalculate five-day rolling service averages using daily aggregation, a calendar join, and PostgreSQL window functions.
Exl
EXL ServiceFind repeated employee names in Epsilon's directory using GROUP BY, HAVING, a subquery, and department joins.
Epsilon