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Senior Product Engineer at Promptfoo. Remote Location: SF Hybrid. About Promptfoo. Promptfoo is the leading AI security testing platform, trusted by 90,000+ developers to build secure, reliable AI applications. Backed by Andreessen Horowitz, we equip the world's largest enterprises with automated red teaming, vulnerability scanning, and continuous monitoring for LLM-based systems.. The Role. We're hiring our first Senior Product Engineer to shape core features and scale our open-source toolkit into an enterprise-grade platform. You will speak with users, scope solutions, ship code across the stack, and raise our engineering bar.. What You'll Do. Product Discovery (20%). Chat with ML, security, and DevOps teams to map pain points. Turn feedback into concise specs and quick prototypes. Full-Stack Development (50%). Build React UI, Node.js/TypeScript APIs, and Python plug-ins. Own end-to-end delivery from design to docs. Quality & Performance (20%). Add tests, refine types, and optimize evaluation pipelines. Improve CI/CD, linting, and release automation. Open Source & Community (10%). Review community PRs, mentor contributors, and polish docs. Demo new features in GitHub issues, Discord, and webinars. What We're Looking For. Must-Haves. 6+ years building production software with senior-level impact. Strong TypeScript plus comfort with React, Node.js, and SQL. Experience shipping or integrating LLM-powered systems. Track record of open-source contribution or maintenance. Habit of writing tests and leaving code cleaner than you found it. Clear written and verbal communication; enjoy talking with customers. Thrive on ownership and quick iteration in an early-stage startup. Nice-to-Haves. Python, Rust, or Go experience. Background in security, red teaming, or developer tooling. Experience scaling event-driven or queue-based systems. What Makes This Role Unique. High Ownership. : Drive product direction and architecture for a category-defining platform. Visible Impact. : Your code ships to thousands of developers the same day. Learning. : Work at the cutting edge of AI security and LLM evaluation. Culture. : Remote-first, test-driven, community-minded team that values clean code