Senior Frontend Product Engineer (JS/React)

What you will do

• Make our codebase AI-ready: define clear module boundaries, improve API contracts, add semantic context, and build the structured documentation that makes AI agents more effective across every repo.
• Design and implement agent workflows that go beyond chat: multi-step reasoning, tool use, autonomous task execution, and human-gated checkpoints.
• Run experiments, validate with real users, and iterate based on evidence. We measure learning velocity, not just output.
• Collaborate closely with product managers and designers to shape what we build, not just how we build it. We expect a product mindset, not just technical execution.
• Act as a knowledge multiplier, sharing what you learn across and beyond your team to raise the bar for everyone.

About you

• 5+ years of experience building web apps.
• Experience with single page applications built with JavaScript and React.
• Experience with our favorite approaches and frameworks is always welcome (TypeScript, Continuous and Progressive Delivery with Feature Flags).
• A solid understanding of functional programming principles.
• Confident designing frontend architecture and passionate about performance.
• Experience mentoring and helping teammates, doing code reviews and pair-programming.
• Drive to have the editor and tooling set up perfectly.
• The initiative to fix something that's broken, rather than waiting for someone else to do it.
• Able to win a debate on tabs vs. spaces conducted entirely in English.
• Bring product thinking to engineering work. You can articulate why something matters for users, not just how it works technically.
• Embrace AI as a daily tool in your own workflow. You use AI coding assistants, iterate on prompts, and constantly look for ways to move faster.
• Are curious about what agent native architecture looks like: how to structure codebases, APIs, and documentation so AI agents can operate effectively at scale.