Founding Product Engineer
$200,000–$250,000 year
On-siteSan Francisco, California, United States
Job Summary
Own whole product modules end-to-end by scoping with customers, designing versioned APIs, building UIs, and shipping features. Design and evolve architecture for agentic AI systems spanning Slack bots, terminal interfaces, and vendor integrations. Ensure features are drivable by LLM agents via MCP/FastMCP servers and conversational interfaces. Move pricing and business logic off the client into backend services to preserve financial fidelity. Extend and maintain a typed pricing ontology using Pydantic models. Lead technical discussions, establish testing and observability practices, and mentor peers to shape engineering culture. Treat money-handling code as load-bearing infrastructure with a focus on root-cause analysis. This hands-on role at a founding team builds an AI-driven pricing platform for B2B companies, requiring 8+ years of full-stack experience and on-site presence in San Francisco.
Required Qualifications
- 8+ years of engineering experience with strong full-stack skills and proven ownership of product areas at startup or staff engineer scope
- Deep backend expertise — experience with FastAPI, Python, and MongoDB or a comparable modern stack
- Credible frontend skills with React and TypeScript; able to ship a clean, polished UI independently
- Track record of taking ambiguous customer problems to shipped features without a dedicated PM
- Experience designing and building REST or GraphQL APIs with clear contracts and versioning
- High standards for correctness, especially around financial or pricing logic
- Must be legally authorized to work in the US — no visa sponsorship is available
Desired Qualifications
- Interest or hands-on experience in B2B monetization: pricing models, packaging, quoting, billing, or CPQ
- Familiarity with AI-assisted development tools (e.g. Cursor, Copilot) and experience integrating LLM agent tooling or MCP-like servers
- Prior experience as an early or founding engineer at a startup
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