Senior Frontend Engineer (Performance)

Role Overview

Senior Frontend Engineer (Performance) on the Viewer team, focused on frontend performance tuning and optimization for high-traffic live streaming experiences.

Responsibilities

• Diagnose and resolve issues related to:
  • Excessive renders
  • Long tasks
  • Memory leaks
  • Layout shifts
  • Heavy JavaScript execution
• Define and improve measurable performance targets using monitoring tools and business metrics.
• Establish and maintain performance budgets, dashboards, and alerts.
• Share and scale performance expertise through:
  • Technical talks and workshops
  • Documentation
  • Mentoring
  • Performance tooling

Requirements

• Bachelor’s degree in Computer Science (or related) or equivalent experience.
• Deep expertise in modern frontend frameworks (React, Angular, Vue, Svelte, etc.), TypeScript, JavaScript, HTML, and CSS.
• Expert proficiency with:
  • Chrome DevTools
  • React Profiler
  • Lighthouse
  • CPU profiling and performance analysis tools
• Senior-level technical leadership; ability to influence architecture and advise cross-functional teams.
• Strong understanding of browser internals (JavaScript execution, layout, painting, compositing).
• Proven experience improving Core Web Vitals using real-user data.
• Hands-on experience diagnosing memory leaks and optimizing rendering and asset delivery performance.

Compensation & Benefits

• Base salary: $180,000–$215,000 annually (excluding additional compensation/benefits).
• Fully remote option.
• Health/vision/dental/life insurance (premiums covered), disability insurance.
• Unlimited paid time off, year-end company closure, paid holidays.
• Optional 401(k) with 5% matching.
• Remote stipend or paid lunches (in-office: paid lunches; remote: $125/week stipend).