Summary
What you’ll impact
The Staff Frontend Engineer leads web performance across a high-frequency trading platform, delivering fast, responsive user experiences for active traders. They apply deep JavaScript/TypeScript expertise, profile browser rendering pipelines, and use Chrome DevTools, Lighthouse, and Core Web Vitals. Responsibilities include building real-time UI components with Canvas, Web Workers, or WebSockets, setting performance benchmarks, and monitoring frame rates. The engineer partners with product, design, and backend teams, drives performance-first standards through code reviews, and helps shape roadmap planning.
Responsibilities
What you'll do
- Lead web performance across the organization — profiling, diagnosing, and shipping measurable improvements to speed, responsiveness, and runtime efficiency platform-wide
- Go deep on JavaScript internals, browser rendering pipelines, and real-time data handling to deliver a best-in-class experience for active traders
- Build and optimize high-frequency, real-time UI components that handle streaming market data without compromising frame rate or user experience
- Establish performance benchmarks and monitoring systems that create a repeatable, lasting standard for the team
- Drive a performance-first culture through code reviews, technical documentation, and engineering standards
- Contribute to end-to-end feature development across core trading surfaces, applying your performance expertise where it matters most
- Partner with product, design, and backend engineers to deliver polished, reliable experiences at scale
- Participate in roadmap planning and help scope technical work, balancing feature delivery with ongoing platform health
Requirements
What you’ll bring
- 7+ years of experience building web applications, including time on products where performance was a hard requirement rather than an afterthought
- Deep expertise in JavaScript and TypeScript, including a strong working knowledge of JavaScript engine internals, memory management, and garbage collection behavior
- Hands-on experience profiling and optimizing browser rendering pipelines — layout, paint, compositing — and diagnosing jank, long tasks, and main-thread contention
- Proven ability to build and optimize high-frequency, real-time UI that renders streaming data while maintaining a consistent frame rate (experience with Canvas, Web Workers, WebSockets, or similar is a plus)
- Fluency with performance tooling and measurement: Chrome DevTools, Performance/Lighthouse, flame charts, and Core Web Vitals or comparable runtime metrics
- This role is based in Menlo Park, CA or New York, NY office(s), with in-person attendance expected at least 3 days per week