Frontend Engineer

Frontend Engineer Company: Fullstack Location: New York, NY (on-site 5 days per week) Compensation: $185,000 - $300,000 + competitive equity Employment Type: Full-time Visa Sponsorship: TN and H-1B transfers only (excluding H-1B holders in year 3 or year 6) About Fullstack Fullstack is building a single front end for crypto trading, bringing perpetuals, cross-chain spot and prediction markets into one portfolio-margin trading experience with a single unified balance. One co-founder built Insilico Terminal, which the company describes as the leading order execution and management system for centralized exchanges; the other ran one of the top on-chain and centralized-exchange HFT firms. Fullstack has raised $15M+ and has a team of about 10. The Role As a Frontend Engineer at Fullstack you will build and scale the core user experience of a retail trading platform designed for speed, clarity and trust. You will own major frontend systems end to end, from architecture to performance, turning complex real-time market data into interfaces that feel intuitive for everyday traders, and ship frequently with design and backend. What You Will Do Build and maintain full-featured web applications and reusable UI libraries that are fast, accessible and scalable. Develop high-performance, interactive charts and real-time visualizations. Optimize speed and reliability with advanced caching to reach sub-second load times. Integrate complex REST APIs and WebSocket streams with robust client-side cached state. Configure and maintain CI/CD pipelines for builds, previews, testing and rollbacks. What You Bring Strong TypeScript, React, JavaScript and CSS Experience with real-time data interfaces and WebSockets Frontend performance engineering Testing (Jest, Vitest, Cypress) and CI/CD Ability to work on-site in New York 5 days a week Nice to Have Trading, fintech or crypto product experience Data visualization and animation (WAAPI) Tech Stack TypeScript, React, JavaScript, CSS, WAAPI, Jest, Vitest, Cypress, REST APIs, WebSockets, CI/CD