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OpenAIMember of the Technical Staff
Building Promptfoo and Codex Security at OpenAI, with a focus on securing AI systems and applying AI to software security.
Engineering leader with 15+ years building products across AI, security, and infrastructure. I'm currently a Member of the Technical Staff at OpenAI, working on Promptfoo and Codex Security. I help secure AI systems and use AI to find software vulnerabilities. I co-founded Promptfoo before it joined OpenAI in 2026. Stanford MS, YC alum, previously VP Engineering.
mldangelo.comhi@mldangelo.comgithub.com/mldangeloto Present
Building Promptfoo and Codex Security at OpenAI, with a focus on securing AI systems and applying AI to software security.
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Promptfoo started as a developer-first eval tool and grew into a platform for AI security, red-teaming, and compliance. It reached more than 350,000 developers, 130,000 monthly active users, and teams at more than 25% of the Fortune 500 before joining OpenAI in 2026.
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Smile Identity provides ML-powered identity verification APIs used by banks, fintechs, and telcos across Africa. Promoted from Director to VP Engineering to VP Engineering & Head of AI within one year, leading teams building APIs that now process hundreds of millions of identity checks.
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Skeptical Investments is a micro-VC fund focused on early-stage technical founders, with investments in ML, infrastructure, and space startups.
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Arthena was a quantitative art investment platform backed by Anthemis, Foundation Capital, and Y Combinator. Built Arthena from idea to acquisition by Masterworks in 2023.
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Matroid is a computer vision platform for creating and deploying detectors, now funded by NEA and Accel. I co-founded the company and built the initial product through our first fundraise.
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References available upon request. Get in touch →