AI Engineer, Product at Brex · LumiJobs

Responsibilities

You'll be a product engineer building Brex's Audit Agent — an agentic system that reviews customer spend at scale and replaces the manual work traditionally done by BPO teams. The agent itself reasons; the surrounding product harness is what makes that reasoning useful, trustworthy, and operable for real customers.
That product harness is where you'll live. You'll design and ship the workflows, surfaces, and data flows that turn the agent's output into something a reviewer can trust and act on — from the reviewer experience itself, to the contracts with Brex's financial system of record, to the feedback loops that make the agent better over time. You'll move fluidly between backend and frontend as the work demands, picking the right altitude for the problem rather than defending a layer.
This role sits between deep agent design and the customer-facing UI, and it leans toward whichever side the next user problem lives on. You'll partner closely with the engineers driving each — translating ambiguous product requirements into shipped features, pushing back when the design isn't right, and treating the seam between agent reasoning and human workflow as a first-class product surface.
The majority of your work will be backend: system design, data modeling, API shape. A meaningful minority will be on the UI itself, where you'll build alongside our frontend engineers when that's where the next user problem lives.
Where you’ll work
This role will be based in our San Francisco office. We are a hybrid environment that combines the energy and connections of being in the office with the benefits and flexibility of working from home. We require three coordinated days in the office per week — Monday, Wednesday, and Thursday. As a perk, we also have up to four weeks per year of fully remote work!
Build and ship customer-facing features in production — from sketch to rollout to iteration based on real customer feedback.
Define the data contracts between the agent and the rest of Brex's financial system of record, and evolve them as the product gets sharper.
Stand up feedback and evaluation loops that let us quickly gather product signals and close them with product fixes — better signals, better surfaces, better workflows.
Run experiments on customer-facing behavior (UI flows, prompt-driven product changes, new review modes) and make calls based on what the data says.
Talk to customers and reviewers directly, bring what you learn back into the product, and prioritize what to build next on the team.

AI Engineer, Product

Responsibilities

Qualification

Required

Preferred

Benefits

Company

Brex

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