Staff Web Engineer

## Responsibilities - Lead web performance across Legend — 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 Legend's 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 - 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 ## Nice to Have - N/A ## Benefits - Challenging, high-impact work to grow your career - Performance driven compensation with multipliers for outsized impact, bonus programs, equity ownership, and 401(k) matching - Best in class benefits to fuel your work, including 100% paid health insurance for employees with 90% coverage for dependents - Lifestyle wallet - a highly flexible benefits spending account for wellness, learning, and more - Employer-paid life & disability insurance, fertility benefits, and mental health benefits - Time off to recharge including company holidays, paid time off, sick time, parental leave, and more! - Exceptional office experience with catered meals, events, and comfortable workspaces.