Brex
Mid
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