OpenAI
Research-adjacent loops with strongly practical coding — real problems in a real editor, systems questions about training and serving, and conversations about safety trade-offs.
Typical loop
- 1Recruiter screen
- 2Technical phone screen
- 3Practical coding round in a real editor
- 4Onsite: systems design and domain rounds
- 5Values and mission conversation
Asked on LeetCode
All 17 by time range →- Design Memory AllocatormediumArrayHash TableDesignSimulationfrequency 100.0
- Design SQLmediumArrayHash TableStringDesignfrequency 97.3
- Encode and Decode StringsmediumArrayStringDesignfrequency 87.4
- Flatten Nested List IteratormediumStackTreeDepth-First SearchDesign+2frequency 82.0
- Rotting OrangesmediumArrayBreadth-First SearchMatrixfrequency 82.0
- IP to CIDRmediumStringBit Manipulationfrequency 77.5
- Time Based Key-Value StoremediumHash TableStringBinary SearchDesignfrequency 77.5
- Design Excel Sum FormulahardArrayHash TableStringGraph Theory+3frequency 63.3