Promptfoo

We’re building the leading open-source framework for LLM security and evaluation, trusted by 40,000+ developers. Backed by a16z and led by YC alumni, we are shaping the future of AI safety and reliability. We value experience with open-source projects and a strong interest in AI/ML evaluation, safety, and security. Your work will directly shape how the world responsibly builds, tests, and deploys LLMs and LLM-powered applications.