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

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