Founding Product Engineer

ABOUT THE ROLE Join a small team building AI-driven pricing and monetization software for businesses. You will own product areas end to end, combining customer discovery, technical leadership, and hands-on engineering to deliver dependable features where financial accuracy is essential. WHAT YOU'LL DO - Scope product problems with customers, then design versioned APIs, build user interfaces, launch complete modules, and iterate on them. - Design and evolve architecture for AI-enabled workflows across web interfaces, conversational tools, and integrations. - Make product capabilities accessible to LLM agents through agent interfaces and server tooling. - Move pricing and business logic into backend services to preserve financial accuracy. - Extend typed data models for pricing concepts and related product entities. - Set and maintain practices for testing, observability, deployment, security, and performance. - Lead technical reviews, mentor colleagues, and investigate production incidents involving financial logic. - Improve development workflows that use AI coding tools with appropriate review and quality controls. WHAT WE'RE LOOKING FOR - At least 8 years of software engineering experience, including startup experience owning and delivering full product areas. - Strong backend experience with Python, FastAPI, and MongoDB or comparable technologies, plus production API and data-model design experience. - Practical React and TypeScript skills, including the ability to independently deliver polished interfaces. - Experience taking ambiguous customer needs through scoping and delivery, with limited product-management support. - Background in B2B SaaS pricing, packaging, quoting, billing, or monetization systems. - Experience with financial correctness, safe numerical and timezone handling, and resolving customer-impacting production issues. - Familiarity with AI-enabled product features, LLM agent workflows, or agent tooling; experience with MCP-like servers is a plus. COMPENSATION & BENEFITS Base salary: $200,000 to $250,000 annually. Visa sponsorship is not available; US work authorization is required. LOCATION On-site in San Francisco, California. Candidates must be based in the area or willing to relocate.