Your agent writes and runs code against user data. Design the sandbox.

The model is an untrusted code author with an unlimited imagination, and prompt injection means it can be *aimed*. Strong answers pick an isolation primitive deliberately, then close the channel most designs leave wide open: the data the code is allowed to touch.

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

20 answers per topic instead of 10, plus saved progress and bookmarks · no cardor unlock all 523 remaining answers · ₹2,000 / $25

UP NEXT ON YOUR JOURNEY

Next in this trackYour product runs in 30 customer environments you can't SSH into. Design how you monitor, debug, and upgrade the fleet.Next in this trackYour pilot wowed the customer. Take it to production: 99.9% SLA, real users, their security team watching. Design the path.Next in this trackDecompose: help an Uber Eats driver decide which orders to accept, using historical and live data, including past tips

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