Senior AI Backend Engineer (San Francisco, CA, In-Person)

We're hiring a Senior AI Backend Engineer who will own the backend infrastructure behind multimodal AI agents running in real enterprise environments. This is a hands-on role where distributed systems meet applied AI: you'll build the services that take in messy real-world data, orchestrate agent workflows, keep enterprise data secure, and deliver reliable results at scale. You'll own your area end to end from day one.

What you'll do

• Design, build and deploy backend services end to end, from data ingestion and storage to API design, background processing and deployment
• Build AI orchestration pipelines that hold up against real-world variability, using structured outputs, tool calling, state management and guardrails
• Define the orchestration patterns and evaluation frameworks the team works from, including evals and regression tests so model changes ship with confidence
• Set technical direction for your subsystems: own the roadmap and decide when to pay down tech debt and when to push forward
• Build for enterprise security: least-privilege access, tenant isolation, auditability and safe data handling
• Work with product, design and frontend engineers to turn loose product ideas into concrete technical plans
• Mentor earlier-career engineers through code reviews, architecture guidance and technical writing

You may be a fit if

• You have 4+ years of designing and shipping production backend systems, with real architectural ownership
• You've designed services from scratch that other engineers now build on in production
• You've shipped AI-powered features to production and have your own opinions on orchestration patterns, evals and how these systems fail at scale
• You're comfortable setting direction and owning a roadmap rather than working from a predefined spec
• You're mostly backend (around 80% or more) but happy to work across the stack when needed
• You can work from the San Francisco office 4 days a week (Wednesday is flexible)

Nice to have

• Experience at both large, high-caliber companies and fast-moving startups
• A founder or founding engineer background
• A degree in CS, math, physics, statistics or another highly technical field
• You build with AI tools every day and can help the team move faster with AI-assisted workflows

What we offer

• Competitive compensation plus equity
• Fully covered medical, dental and vision
• Visa sponsorship (H-1B, O-1, OPT) and relocation support to the Bay Area
• Learning and wellness budgets
• Daily catered meals at the office