Founding Product Engineer

ABOUT THE ROLE Join an early-stage B2B SaaS pricing company as a hands-on product engineer, owning complete product areas from customer discovery through launch and iteration. You will shape the architecture and engineering practices behind AI-driven pricing and monetization tools, where reliable financial logic and useful agent-driven workflows are essential. WHAT YOU'LL DO - Scope product needs with customers, design versioned APIs, build user interfaces, and deliver complete product modules. - Design and evolve systems for AI-driven workflows across web applications, conversational interfaces, and third-party integrations. - Make product features usable by LLM agents through MCP-compatible services and other agent tooling. - Move pricing and business logic into backend services to support accurate, dependable financial calculations. - Extend typed data models for pricing concepts and develop maintainable APIs and services. - Establish testing, observability, deployment, and performance practices for production systems. - Lead technical discussions, mentor teammates, and investigate production issues with a focus on root causes. WHAT WE'RE LOOKING FOR - At least 8 years of software engineering experience, including startup experience and staff-level ownership of product areas. - Strong backend skills with production experience in Python, FastAPI, and MongoDB or a comparable stack. - Practical React and TypeScript experience, including independently shipping polished user interfaces. - Experience taking ambiguous customer problems from scoping through delivery, including designing versioned APIs and data models. - Background integrating AI features or agent-driven workflows; MCP-like tooling experience is a plus. - Familiarity with B2B SaaS monetization, such as pricing, packaging, quoting, billing, or CPQ. - High standards for correctness in financial logic and authorization to work in the United States without visa sponsorship. COMPENSATION & BENEFITS Salary range: $200,000 to $250,000 annually. Visa sponsorship is not available. LOCATION On-site in San Francisco, California, United States.