Frontend Developer

Overview

We’re building an AI evaluation platform that’s becoming indispensable for AI teams. As a Frontend/SDK Developer Level 6, you’ll help shape both the developer-facing SDKs and the product frontend experiences that power the platform. This role goes beyond frontend implementation. We’re looking for someone who can design and maintain high-quality TypeScript SDKs, developer facing APIs, and reusable frontend systems that other developers will directly interact with and depend on. Your code will be visible to external developers and engineering teams, so usability, maintainability, performance, and API design quality matter deeply. You’ll work across product frontend engineering and SDK/platform development using React 19, TypeScript, Tailwind, and modern frontend tooling.

requires strong judgment in frontend architecture, reusable abstractions, integration design, performance optimization, and long-term maintainability. We operate with the intensity and ownership mentality of a bootstrapped startup. That means high autonomy, fast iteration cycles, and team members who are willing to put in extra effort when it counts during critical sprints. What You’ll Do SDK & Developer Platform Engineering Design and maintain TypeScript SDKs and developer-facing libraries. Build reusable abstractions, APIs, and frontend utilities that external developers can reliably integrate with. Design maintainable SDK interfaces with scalability and developer usability in mind. Contribute to package architecture, frontend platform consistency, and reusable component systems. Write robust automated tests for SDK reliability and frontend quality. Contribute to developer experience improvements across tooling, package structure, and integration workflows. Product Frontend Development Build and maintain responsive, accessible UI components using React 19 and TypeScript. Implement user-focused designs using Tailwind CSS. Contribute to frontend architectural planning to ensure maintainable and scalable solutions. Apply independent problem-solving to resolve complex UI and integration challenges. Optimize application performance, accessibility, and responsiveness across devices and browsers. Handle client-side routing, data fetching, and form logic using TanStack Router, React Query, and React Hook Form. Integrate frontend systems with backend APIs in collaboration with backend developers. Participate in code reviews, advocate engineering best practices, and maintain high code quality standards. Must-Have Skills 6 years of professional software engineering experience in employed roles (independent project work does not count toward experience