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Senior Full-Stack Engineer

Senior Full-Stack Engineer

Promptfoo, Inc.San Francisco, CA, United States
30+ days ago
Job type
  • Full-time
Job description

About Promptfoo

Promptfoo is the leading AI security testing platform, trusted by 250,000+ developers to build secure, reliable AI applications. Backed by Andreessen Horowitz and Insight Partners, 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
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    Senior Fullstack Engineer • San Francisco, CA, United States