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System Design & Production Engineering / 33
mediumOpenAI

The OpenAI FDE take-home: build something real on the API in ~5 hours, record a walkthrough, how do you stand out?

Reported loop detail: roughly 5 hours to build a RAG system, agent, or eval harness on OpenAI's APIs, a recorded video walkthrough, then a 60-minute defense. The hour-by-hour allocation, why the eval section is the differentiator, and what the video is actually screening for.

Updated Aug 2026 · Grounded in real Forward Deployed Engineer interview loops and written to a senior-engineer editorial bar.

Reported loop detail: roughly 5 hours to build a RAG system, agent, or eval harness on OpenAI's APIs, a recorded video walkthrough, then a 60-minute defense. The hour-by-hour allocation, why the eval section is the differentiator, and what the video is actually screening for.

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