Senior/Staff Engineers, Security Researchers, GTM & Founding Operators

Promptfoo | Senior/Staff Engineers, Security Researchers, GTM & Founding Operators | REMOTE (North America) / Hybrid San Mateo CA | Full-time | https://promptfoo.dev Promptfoo is the MIT-licensed open-source toolkit 125 000+ developers use to evaluate and secure LLM apps. We just closed an $18.4 M Series A led by Insight Partners with participation from a16z and are scaling a small, senior team of high-agency builders. Open roles - Senior / Staff Full-stack Product Engineer (TypeScript + Python) - Senior / Staff AI Security & Red-Team Engineer - Solutions Architect / SE (multiple) - Product Marketing Manager (cyber focus) - Enterprise Account Executive (Bay Area, multiple) - Technical Writer - Developer Advocate Why join - Build the definitive AI security stack already used at 30+ Fortune 500s. - Work in open source. - Competitive salary, meaningful equity, async-friendly culture of ownership. How to apply 1. Skim https://github.com/promptfoo/promptfoo then run: npx promptfoo@latest init --example getting-started 2. Email careers@promptfoo.dev with subject “HN – July 2025”, a short intro, and a GitHub / LinkedIn link. 3. I reply to every thoughtful application and send swag to anyone who tries or contributes to Promptfoo. Careers page: https://www.promptfoo.dev/careers/