Promptfoo, Inc.
About Promptfoo
Promptfoo is the leading AI security testing platform, trusted by 100,000+ 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 a strong 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
Promptfoo is the leading AI security testing platform, trusted by 100,000+ 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 a strong 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