Full-Stack Engineer

Position: Staff Full-Stack Engineer

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 staff 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. As a staff engineer, you'll also mentor team members and help establish technical standards that drive excellence across the organization.

What You'll DoProduct Discovery (20%)

• Chat with ML, security, and Dev Ops teams to map pain points
• Turn feedback into concise specs and quick prototypes

Full-Stack Development (40%)

• Build React UI, Node.js/Type Script APIs, and Python plug-ins
• Own end-to-end delivery from design to docs

Quality & Performance (15%)

• Add tests, refine types, and optimize evaluation pipelines
• Improve CI/CD, linting, and release automation

Engineering Leadership & Mentorship (15%)

• Mentor mid-level and senior engineers through code reviews, pair programming, and technical guidance
• Set technical standards and best practices that elevate the entire engineering team
• Lead architectural discussions and help the team navigate complex technical decisions
• Foster a culture of learning through documentation, internal tech talks, and knowledge sharing

Open Source & Community (10%)

• Review community PRs, mentor contributors, and polish docs
• Demo new features in Git Hub issues, Discord, and webinars

What We're Looking For Must-Haves

• 6+ years building production software with staff-level impact
• Strong Type Script 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
• Experience mentoring engineers and raising team capabilities through code reviews and technical guidance
• Demonstrated ability to lead technical initiatives and influence engineering culture

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
• Leadership
  :
  Shape engineering standards and mentor talented engineers in a growing team

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