Software Engineer, AI

What is Bilt?

The role

What you'll work on

• Agent capabilities end to end: tools, workflows, prompts, and the integrations with Bilt and partner systems behind them
• The agent runtime: multi-agent orchestration, context and memory, prompt caching, and routing across frontier and open-weight models
• Performance: p50 and p99 across the full request path, bursty traffic, and cost per conversation
• Eval harnesses, LLM judges, and conversation replay, so every model and prompt change is measured before it ships
• Assistants for merchants' staff that work from the business's own data, and browser agents that can act where no API exists
• Proactive features that drive engagement with members and merchants' customers: briefings, follow-ups, and outreach that land at the right moment
• The conversation platform: one inbox where the agent, merchant staff, and Bilt support share threads across SMS, iMessage, email, web, and in-app chat
• Messaging: realtime streaming replies, attachments, message ordering and idempotent delivery, carrier and iMessage sending limits, and handing off to a person at the right moment
• Authentication and fine-grained authorization, so the agent only sees and does what it should for members, merchants, and staff

How we build

• Writing. Coding agents like Claude Code and Devin write much of our code. You design it, review it, and own what ships
• Reviewing. Every PR gets AI review against rules we write down (prompt-cache pitfalls, security, performance) before a human codeowner signs off
• Debugging. Agents have access to our production tooling through an internal MCP gateway: logs, traces, analytics, feature flags, and the service catalog. Investigations usually start with an agent pulling the evidence
• Sharing context. Repos carry agent instructions, and we keep a shared library of skills and playbooks, so recurring work becomes a single command and every agent starts with the team's context
• Owning. Each engineer owns a large surface from design through rollout and on-call. We ship daily behind flags, treat performance and availability as acceptance criteria, and read real conversations, not only dashboards

You have

• 4+ years building and operating backend services in production
• Strength in at least one backend language and experience running services in the cloud. We mostly use Python (FastAPI), Java (Quarkus), and Go on Google Cloud
• Solid distributed systems fundamentals (async processing, pub/sub, idempotency, retries, caching), and you debug across services with logs, traces, and metrics
• Hands-on experience with LLMs, at work or on your own, and curiosity about making them reliable
• Product judgment: you can read a bad conversation and tell whether the cause is the prompt, a tool, the data, or a service
• Daily use of AI coding agents, and good judgment about when to trust their output
• Clear writing. Design docs, PR descriptions, and the prompts you give agents all matter here

Bonus

• Shipped an LLM-powered feature to real users, and can explain what broke and how you measured it
• Agent frameworks (Google ADK, LangGraph, or similar), tool calling, evals, LLM-as-judge
• Model serving and inference: provider routing, open-weight models, latency and cost tuning
• Messaging or realtime infrastructure
• Browser automation or computer-use agents
• Identity and access: OAuth/OIDC, token exchange, fine-grained authorization

Benefits

• Compensation - We offer a competitive salary with a meaningful stake in the company via equity and our performance bonus program
• Health insurance for you (& your loved ones) from day one - Enjoy a One Medical Membership, wellness stipends, family programs and more, on us. We’ve got you and your family covered from day one.
• 401k plan with a match - Retirement may feel more like a pipe dream than a reality but we’re here to help you get there.
• Commuter FSAs - We believe the best ideas come from being together in one place. We just don’t think getting there should be so expensive.
• UNLIMITED PTO - Because we believe that working hard shouldn’t mean always working. Take time for yourself as often as you need it.
• Exclusive Employee only Bilt Points - We give our employees unique opportunities to earn points throughout their time at Bilt.
• Team Events - We believe in human connection so we hold events to help our employees break from the monotony of the typical work week.