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