Frontend Engineer

Company: Fullstack
Location: New York NY (on-site 5 days per week)
Compensation: $185000 - $300000 competitive equity
Employment Type: Full-time
Visa Sponsorship: TN and H-1B transfers only (excluding H-1B holders in year 3 or year 6)

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.

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.

• 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.

• 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

• Trading fintech or crypto product experience
• Data visualization and animation (WAAPI)

TypeScript React JavaScript CSS WAAPI Jest Vitest Cypress REST APIs WebSockets CI/CD

REVENUE: 21.25% of first-year salary. Est. fee per hire $39K-$64K; 3 seat(s) up to $155K if all filled.

TARGET COMPANIES (suggested): Hyperliquid Coinbase Jump Crypto Wintermute dYdX Kraken.

BEST-FIT CANDIDATE: unspecified yrs; React/TS perf; real-time data UI; visa: TN or H-1B transfer only (not yr 3/6); location: NYC 5 days.