Frontend Developer

Overview

\nWe’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.\n\n

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.\n\nWhat You’ll Do\n\nSDK & Developer Platform Engineering\nDesign and maintain TypeScript SDKs and developer-facing libraries.\nBuild reusable abstractions, APIs, and frontend utilities that external developers can reliably integrate with.\nDesign maintainable SDK interfaces with scalability and developer usability in mind.\nContribute to package architecture, frontend platform consistency, and reusable component systems.\nWrite robust automated tests for SDK reliability and frontend quality.\nContribute to developer experience improvements across tooling, package structure, and integration workflows.\n\nProduct Frontend Development\nBuild and maintain responsive, accessible UI components using React 19 and TypeScript.\nImplement user-focused designs using Tailwind CSS.\nContribute to frontend architectural planning to ensure maintainable and scalable solutions.\nApply independent problem-solving to resolve complex UI and integration challenges.\nOptimize application performance, accessibility, and responsiveness across devices and browsers.\nHandle client-side routing, data fetching, and form logic using TanStack Router, React Query, and React Hook Form.\nIntegrate frontend systems with backend APIs in collaboration with backend developers.\nParticipate in code reviews, advocate engineering best practices, and maintain high code quality standards.\n\nMust-Have Skills\n6 years of professional software engineering experience in employed roles (independent project work does not count toward experience