Summary
What you’ll impact
The Staff Web Performance Engineer leads performance optimization for a high‑frequency trading web platform, delivering ultra‑low latency and responsive user experiences. Using deep JavaScript/TypeScript expertise, Chrome DevTools, Lighthouse, and browser rendering techniques—including Canvas, Web Workers, and WebSockets—they build real‑time UI components, set benchmarks, and resolve rendering bottlenecks. They collaborate with product, design, and backend teams, driving a performance‑first culture through code reviews, standards, and 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