Staff Web Engineer

United States Digital Space LLC; Menlo Park (CA); Hybrid; USD 230,000 - 270,000; Full time

Benefits offered by this job

100% paid health insurance

401(k) matching

Flexible benefits spending account

Paid time off

Job summary

United States Digital Space LLC is seeking a Staff Web Engineer to lead performance initiatives on their trading platform. This role emphasizes optimization of web applications to enhance user experience for active traders. Candidates should have 7+ years of experience in web apps with strong JavaScript and performance knowledge.

Position based in Menlo Park with in-person attendance expected. The company provides competitive benefits including health insurance, equity ownership, and a flexible lifestyle wallet.

Qualifications

• 7+ years experience in web applications with a focus on performance.
• Deep expertise in JavaScript engine internals and memory management.
• Hands-on experience in browser rendering optimization.

Responsibilities

• Lead performance improvements across the platform.
• Optimize real-time UI components for streaming market data.
• Establish performance benchmarks and monitoring systems.

Skills

JavaScript expertise

TypeScript knowledge

Performance optimization

Real-time UI development

Tools

Chrome DevTools

Lighthouse

Job description

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.

About the team + role

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.

What you’ll do

• 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

What you 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

What we offer

• 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.

In addition to the base pay range listed below, this role is also eligible for bonus opportunities + equity + benefits.

Base pay for the successful applicant will depend on a variety of job-related factors, which may include education, training, experience, location, business needs, or market demands.

Base pay range for this role is based on the location where the work will be performed and is aligned to one of 3 compensation zones. For other locations not listed, compensation can be discussed with your recruiter during the interview process.

Base Pay Range:

• Zone 1 (Menlo Park, CA; New York, NY; Bellevue, WA; Washington, DC): $230,000–$270,000 USD
• Zone 2 (Denver, CO; Westlake, TX; Chicago, IL): $203,000–$238,000 USD
• Zone 3 (Lake Mary, FL; Clearwater, FL; Gainesville, FL): $180,000–$211,000 USD

Click to learn more about our Total Rewards.

If our mission energizes you and you’re ready to build the future of finance, we look forward to seeing your application.

The company provides equal opportunity for all applicants, offers reasonable accommodations upon request, and complies with applicable equal employment and privacy laws. Inclusion is built into how we hire and work—welcoming different backgrounds, perspectives, and experiences so everyone can do their best. Please review the Privacy Policy for your country of application.