OpenAI 2026 SWE Interview Loop Revealed: 48-Hour Take-Home and a Beta Agentic Coding Round

SumitGup · x · 2026-10-29

A candidate shared a full breakdown of OpenAI's SWE interview loop, which differs notably from typical big-tech processes:

Recruiter screen: light chat, asks where you think AI is headed; reading OpenAI's charter beforehand is advised.
Technical screen: two 60-minute rounds same day — a versioned key-value store coding problem, plus a fault-tolerant job scheduler system design.
Take-home: 48 hours to build something real; the author got a distributed webhook delivery system with retry logic and dead-letter queues.
Deep dive: interviewer walks through the take-home line by line with a pre-built question list on every decision.
Onsite (4 rounds): progressive multi-part coding (token-level streaming differ with rollback), a systems-flavored round (state management, concurrency, Python internals), a "design ChatGPT" system design round focused on GPU allocation, autoscaling under non-stationary traffic, and behavioral rounds on concrete tradeoffs.
Agentic coding round (beta): some candidates get a fifth round — an existing codebase plus a problem too large to solve by hand, expected to be tackled with an AI coding agent.

The standout signal: OpenAI is formally testing AI-agent-assisted engineering in its hiring loop.

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