Web Engineer

Join us in building the future of finance.

Our mission is to democratize finance for all. An estimated $124 trillion of assets will be inherited by younger generations in the next two decades. The largest transfer of wealth in human history. If you’re ready to be at the epicenter of this historic cultural and financial shift, keep reading.

The the company Legend team builds and owns our advanced desktop trading platform, designed to meet the needs of active and sophisticated traders. The team works across real-time data infrastructure, advanced charting, options and futures trading tools, and highly customizable workspace experiences. Their mission is to deliver a professional-grade platform that combines the power of institutional trading tools with the company's signature approachable design.

As a Staff Web Engineer
, performance is your mandate. You'll set the standard for what a web-based trading platform can be — going deep on JavaScript internals, browser rendering pipelines, and real-time data optimization to make Legend the fastest, most responsive platform of its kind. For active traders, milliseconds matter, and you'll own the work that ensures Legend never gets in their way.

This is a performance-first role. You'll lead the initiatives that make Legend faster and more efficient, while also contributing to feature development across core trading surfaces where your performance expertise has the greatest impact. The work balances deep technical execution with meaningful cross-functional partnership.

This role is based in our Menlo Park, CA or New York, NY office(s), with in-person attendance expected at least 3 days per week.

At the company, we believe in the power of in-person work to accelerate progress, spark innovation, and strengthen community. Our office experience is intentional, energizing, and designed to fully support high-performing teams.

• 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

• 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 Type Script, 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, Web Sockets, or similar is a plus)
• Fluency with performance tooling and measurement:
  Chrome Dev Tools, Performance/Lighthouse, flame charts, and Core Web Vitals or comparable runtime metrics

• 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…