Staff Full-Stack Engineer
Why Promptfoo
Promptfoo, the leading AI Security platform, enables enterprises to systematically identify, track, and remediate AI vulnerabilities across the entire portfolio of AI applications, agents, and RAG systems. Available in open source and commercial versions, Promptfoo can be deployed on-prem or in the cloud. With the compliance mapping to OWASP Top 10 for LLMs and NIST for RMF and centralized reporting for executive visibility, Promptfoo helps security leaders scale AI adoption without compromising security or data ownership. Adopted by 300K+ developers, recommended by OpenAI and Anthropic, and backed by a16z and Insight Partners, Promptfoo is trusted by over 127 of the Fortune 500 companies. Learn more at promptfoo.dev.
About 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 Do
Product Discovery
Chat with ML, security, and DevOps teams to map pain points
Turn feedback into concise specs and quick prototypes
Full-Stack Development
Build React UI, Node.js/TypeScript APIs, and Python plug-ins
Own end-to-end delivery from design to docs
Quality & Performance
Add tests, refine types, and optimize evaluation pipelines
Improve CI/CD, linting, and release automation
Engineering Leadership & Mentorship
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
Review community PRs, mentor contributors, and polish docs
Demo new features in GitHub issues, Discord, and webinars
Who You Are
Must-Haves
6+ years building production software with staff-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
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