OpenAI
Applied ML systems, inference-time performance work, and a debugging round on unfamiliar code.
- Active questions
- 5
- Rounds covered
- 3
- Last reviewed
- Aug 27, 2026
Reported questions
The full collection. Each entry shows how many independent reports it has and when it was last seen in a live loop.
- ML designHard
Cut p99 serving latency in half
An inference service meets its p50 target but misses p99 by 3x
4 reportsAug 27, 2026 - DebuggingMedium
Fix the failing test in an unfamiliar repo
You are given a repository you have never seen and one failing test
3 reportsAug 27, 2026 - ML designHard
GPU utilisation is stuck at 45%
A training job holds 45% utilisation on an otherwise idle node
2 reportsAug 16, 2026 - ML designMedium
Decide whether a ranking change shipped well
Offline metrics improved but the online engagement metric is flat
1 reportAug 18, 2026 - CodingMedium
Cache with expiry and bounded memory
Implement a cache with a maximum entry count and a per-entry TTL, with O(1) get and put
5 reportsAug 16, 2026
Interviewed at OpenAI recently?
Corroborating a question takes reports from people who did not interview together. Adding yours is what keeps this collection from drifting out of date.