Senior Full Stack Engineer (Back-End)
About the role
Senior Full Stack Engineer (Back-End) at Wordware (Sauna by Wordware) based in San Francisco. Full-time, in-person role focusing on backend and full-stack features for AI agent infrastructure and real-time systems. Requires 5+ years of experience, US work authorization, and Bay Area relocation if not local.
Responsibilities
- Build and operate the sandbox infrastructure where agents execute code, process isolation, resource limits, secure credential handling across thousands of concurrent sessions.
- Design the deployment and migration pipeline for a Cloudflare Workers + Fly.io architecture, including blue-green rollouts and canary patterns.
- Instrument real-time workloads end to end: SSE streaming, task queues, and multi-model LLM provider routing.
- Ship new backend capabilities, tool integrations, scheduled task execution, memory indexing.
- Reduce operational toil for a small team: structured logging, tracing, monitoring, and incident response tooling that actually works at our scale.
- Plus whatever you see that needs building.
Qualifications
- 5+ years of engineering experience building and operating backend systems in production.
- Fluent in TypeScript and comfortable across the stack, with a backend-first inclination.
- Experience building real-time systems: WebSockets, SSE, event streaming, or message queues in production.
- Distributed systems intuition, understanding of consistency tradeoffs.
- Experience shipping infrastructure to real users, not just internal tooling.
Skills
Benefits
- health, dental, 401(k)
- meaningful early-stage equity
- considerable PTO
- gym budget
- lunch
About Wordware
AI agents you can rely on
AI Agents have arrived. They are powerful enough to read, plan, and act across your everyday life and work. The question is no longer whether they can run canned demos to check the weather, it’s whether real teams can rely on them for critical work. We optimize for adoption over spectacle: useful, accountable systems that help top professional complete real tasks. Wordware is backed by Spark Capital, Felicis, and Y Combinator, with a $30M seed round. Our beautiful, historic San Francisco office sits in the shadow of the Golden Gate Bridge, it’s full of plants and radiates innovation and calm. We genuinely love working together. At lunch we talk about alignment and AI consciousness, we have surfboards in the office ready to use, we take walking meetings on the beach and hang out after work at the bar or climbing wall. We work really hard because we care deeply about what we do. Sauna is Wordware’s AI workspace for professionals. Think ‘Cursor for Knowledge Work’ and you’re halfway there. With explicit permission, it connects to tools like Gmail, Calendar, Slack, and thousands more, to gather the right context to move your work forward. It learns who you are, drafts and refines your documents, presentations, and datasets, researches across the web and your org’s internal knowledge, summarizes long threads to cut through the noise, proposes next steps, even acts on your behalf when enabled. You can work with Sauna live, side-by-side, or schedule jobs to run automatically in the background, with clear permissions and easy off-switches. Sauna brings the power of AI Agents to all professionals.
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