Build the product harness around Brex's Audit Agent, not just the agent itself

Brex is hiring a product engineer to build the workflows, UI, and data contracts that make its agentic Audit Agent trustworthy and usable for real financial reviewers. Expect deep questions on shipping across the full stack, designing feedback loops for a non-deterministic system, and owning ambiguous product surfaces end-to-end.

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What this interview tests

End-to-end ownership across backend and frontend
Agent/product harness design (reviewer UX, data contracts, feedback loops)
System design, data modeling, API shape
Running experiments on customer-facing behavior
Working with non-deterministic/LLM-based systems
Cross-team collaboration and pushing back on design seams

Common question themes

Describe designing the data contract between an agent and a system of record

Tell me about a customer-facing feature you shipped end-to-end, backend and frontend

How would you build a feedback/evaluation loop for an agent whose output humans review

Tell me about a time you pushed back on a design across a team boundary you didn't own

How do you handle a system where the underlying model is non-deterministic

Walk through an experiment you ran on a UI flow and what you did with the results

How candidates describe it

Real AI Engineer interview stories — retold from candidates' public write-ups, with sources.

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Interviewed January 2023 · Not specified

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