Staff Web Engineer

You will be responsible for leading web performance across the Legend trading platform. You will go deep on JavaScript internals, browser rendering pipelines, and real time data handling to deliver a fast, reliable experience for active traders. You will build and optimize high frequency, real time UI components that stream market data while maintaining a smooth frame rate. You will establish performance benchmarks and monitoring systems to create a repeatable standard for the team. You will collaborate with product, design, and backend engineers to deliver polished, scalable experiences.

Responsibilities

• Lead web performance across Legend by 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 while maintaining a stable frame rate
• Establish performance benchmarks and monitoring systems that create a repeatable 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 Legends 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 with performance as a core requirement
• Deep expertise in JavaScript and TypeScript including engine internals memory management and garbage collection behavior
• Hands on experience profiling and optimizing browser rendering pipelines including layout paint and 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
• Fluency with performance tooling and measurement such as Chrome DevTools Performance Lighthouse flame charts and Core Web Vitals

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 health insurance coverage for employees and dependents
• Lifestyle wallet flexible benefits spending account for wellness learning and more
• Employer paid life and disability insurance fertility benefits and mental health benefits
• Paid time off holidays sick time parental leave and more
• Exceptional office experience with catered meals events and comfortable workspaces