OpenAI Interview Questions 2026
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Data Labeling Allocator II
Code Refactoring - Chat Agent Handler
Message Tree Delivery
Implement the 'cd' Command
[System Design] Build Job Orchestration System
Serialize Cluster Topology
Serialize and restore a cluster topology while preserving every node and connection.
Grid Infection
Simulate an infection spreading across a grid and determine when every reachable cell is infected.
Crossword Solver
Shard Rebalancing in KV Store
Persistent KV Store
Design and Implement DB
Design and implement Resumable Iterator
> 2026 > OpenAI > Coding
Social Network with Snapshots
Design an in-memory social network from the ground up. Start with a directed follow graph, then layer on immutable snapshots, timestamped "time travel" queries, and a friends-of-friends recommendation engine.
Four levels
- 1.Follow graph — users follow and unfollow each other
- 2.Snapshots — freeze the current state and query it later
- 3.Time travel — timestamped follows; query any past moment
- 4.Recommendations — friends-of-friends "who to follow"
Support follow, unfollow, and look up a user's followers and followees. Snapshots stay frozen as the graph changes, and is_following_at(a, b, t) answers whether a followed b at time t.
Read the full problem and solution →
Data Labeling Allocator
Type Interpreter
Design CI/CD Pipeline
Counting Subsequences
[System Design] Job Scheduler Part 1