Coval is the testing platform for AI agents. We've raised $3.3M, 10x'd revenue in 2 months, and need a Senior Frontend Engineer to help us build the infrastructure for the agentic future. We are looking for a high agency and ai-enthusiastic frontend engineer to join our founding team!

The Mission AI agents are here to stay. The question isn't if they'll reshape how companies operate—it's who will build the infrastructure that powers them.

That's Coval.

Anyone can spin up an AI agent today. But creating agents that work reliably in production? That's the hard part. And as AI adoption accelerates, testing and evaluation aren't nice-to-haves—they're mission-critical.

We're building the platform that lets companies deploy agents with confidence. This is day one of the agentic era, and evaluation infrastructure will define how it unfolds. We're building THE platform that makes it happen.

Who You Are

• Ex-founder or builder at heart who thrives in startup chaos
• You ship fast, iterate faster, and love the messy early days of company-building
• Obsessed with customers—you own features end-to-end and build with users front of mind
• Expert at ruthless simplification
• Passionate about crafting intuitive, beautiful interfaces
• You know when to take shortcuts and when to build for scale

The Role You'll be a core early team member, directly shaping our product and owning frontend decisions that drive growth.

• Work directly with customers—onboard them, understand their needs, and turn feedback into product decisions
• Thrive in ambiguity: build features with minimal specs, make UX calls on the fly, and figure things out as you go
• Take full ownership—this should feel like your product
• Balance speed with vision—ship fast without losing sight of where we're headed

What You'll Need

• Deep experience with React, TypeScript, and Next.js
• Strong frontend architecture skills and a track record building complex web apps
• A keen design eye and passion for exceptional UX
• Prior startup experience
• Ability to turn complex workflows into simple, intuitive interfaces
• Bonus: Strong intuition for what LLMs can do today and where they're headed
• Bonus: You care deeply about developer experience

Location: 100% in-person in San Francisco

Ready to build the future of AI testing? Join us.