Reddit Interview Questions (2026-2027)

Logger Rate Limiter

Design a Gaming Leaderboard Service

Video Recommendation

Post Click Prediction

Merge Chat Message Windows

Dictionary Word Transformation Path

Feature Store

Tennis Score Game

Billing Status Replay (OOD)

Report Chain

Moderator List Hierarchy

Reddit tech screen - senior software engineer

Billing Status: Track Invoice Lifecycle and Payment State Machine

Build Architect: Design a Dependency-Aware Build System

Chat Messages: Design a Scalable Chat Message Storage and Retrieval System

Find Perfect Location: Find the Optimal Meeting Point on a 2D Map

Reddit SWE Phone - Hit Counter

ML Modeling: Design and Evaluate a Click-Through Rate Prediction Model

Moderator Access Control: Implement Tiered Moderation Permissions for a Community Platform

Similar Communities: Find and Rank Related Communities by Member Overlap

Tennis Game: Model and Simulate a Full Tennis Match with OOP Design

Reddit SWE Phone - Word Ladder

Beating AI: System Design

Does having a name brand company help validate past experiences at unknown companies

Word Search II