Senior fullstack

About the Role

We’re looking for an experienced and independent Senior Full Stack Engineer with a strong system-level mindset to join the founding team of a fast-growing Infra AI startup operating at the frontier of Agentic Browsers.

This is a core position in building our cutting-edge platform from the ground up. You’ll be responsible for end-to-end product development from designing system architecture to hands-on implementation of both frontend and backend components. Your focus will be on clean, modular, and scalable code, all while working closely with a world-class technical team.

Responsibilities

• Lead end-to-end development of product features, based on a deep understanding of user needs and system goals.
• Design and improve the architecture of the platform, including the selection of new technologies and a clear separation of concerns.
• Build high-quality frontend features using React + Next.js with Vite.
• Develop backend logic and APIs using TypeScript and Python.

Requirements

• 5+ years of experience as a Full Stack Engineer.
• Proficiency in TypeScript and JavaScript.
• Proven hands-on experience with React.
• Deep understanding of Next.js, Vite, SSR, and performance optimization.
• Familiarity with CI/CD pipelines and configuration management in GitHub-based environments.
• Strong architectural thinking and system-wide ownership.

Bonus Points

• Experience building systems from scratch.
• Track record of conducting code reviews and/or leading small engineering teams.
• Knowledge of microservices or serverless architectures.
• Experience in building or maintaining a Design System.
• Advanced debugging skills, including memory leak detection and performance bottlenecks.