Founding Product Engineer

ABOUT THE ROLE Join a small B2B SaaS team building AI-powered pricing and monetization software. In this hands-on role, you will own product modules from customer discovery through launch, shaping reliable systems for complex pricing workflows. WHAT YOU'LL DO - Scope product problems with customers, then design versioned APIs, build user interfaces, launch complete modules, and iterate on feedback. - Design and evolve architecture for AI-enabled experiences across web, conversational interfaces, command-line tools, and vendor integrations. - Make product features accessible to LLM agents through agent tooling and conversational workflows. - Move pricing and business logic into backend services to protect financial accuracy. - Extend typed pricing data models and establish testing, observability, deployment, and performance practices. - Lead architectural discussions, investigate production issues, mentor teammates, and improve engineering practices. WHAT WE'RE LOOKING FOR - At least 8 years of software engineering experience, including startup experience owning and delivering full product areas at staff-level scope. - Strong backend experience with Python, FastAPI, and MongoDB or comparable technologies, plus experience designing server-side business logic and versioned APIs. - Hands-on React and TypeScript skills, including the ability to independently deliver a polished user interface. - A track record of turning ambiguous customer needs into shipped products, including customer discovery, data modeling, and end-to-end delivery. - Experience with AI-enabled products or agent workflows; familiarity with MCP-style tooling is beneficial. - Interest or experience in B2B SaaS monetization, including pricing, packaging, quoting, billing, or CPQ. - Strong attention to correctness, particularly in financial logic, and US work authorization without visa sponsorship. COMPENSATION & BENEFITS Base salary: $200,000 to $250,000 annually. Visa sponsorship is not available. LOCATION On-site in San Francisco, California. Candidates must be based in or willing to relocate to San Francisco.