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Senior Backend Engineer - Agent Runtime

sauna by wordware • United State
Visa Sponsorship
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Build and maintain the execution engine behind Sauna's agent sessions, handling state management, tool call retries, and long-running process deployment. Design actor vs. job architecture decisions and ensure runtime failures are traceable and recoverable in production. Requires proven experience building stateful backend systems in TypeScript with Cloudflare Workers and Durable Objects.

Key Highlights
Senior, hands-on engineering role building the agent runtime execution engine
Full-time, in-person role in San Francisco (Presidio) 5 days a week
Company backed by Spark Capital, Felicis, and Y Combinator with $30M seed
Base salary $180K-$240K plus meaningful early-stage equity
Open to O-1 or J-1 visa sponsorship for exceptional candidates
Key Responsibilities
Build and improve the runtime that starts agent work, carries session state through tool calls, and resumes interrupted runs
Choose between actors and jobs for different kinds of work and implement the decision logic
Design how long-running processes drain or resume when code changes, keeping in-flight work accounted for across releases
Handle retries and timeouts around tool calls, including cases where an external action succeeded but the response never came back
Make runtime failures traceable by diagnosing why a run stopped or stalled and fixing the execution path
Technical Skills Required
TypeScript Cloudflare Workers Postgres
Benefits & Perks
Base salary $180K-$240K
Meaningful early-stage equity
Health insurance
Dental insurance
401(k)
Considerable PTO
Gym budget
Lunch
Nice to Have
Experience with an agent runtime or agent harness
Experience with Cloudflare Workers, Durable Objects, or another actor-based runtime
Experience deploying long-running processes that persist or resume work across a code release

Job Description

⚠️ Please read first
  • This is a full-time, in-person role based in San Francisco (Presidio). We work from the office 5 days a week.
  • You must be based in the Bay Area or willing to relocate before starting.
  • We require US work authorisation, but are open to O-1 or J-1 visa sponsorship for exceptional candidates.

Every tool you use was built as an island, so you became the glue between them: a name from Gmail into the CRM, a time from the CRM into Calendly, a note from Calendly into a doc. AI showed up and mostly became an eleventh window to paste into.
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