Senior Frontend Engineer, Performance

This is a fully remote position, open to applicants in United States.

📋 Description

• Identifying, prioritizing, and resolving issues related to unnecessary renders, prolonged tasks, memory leaks, forced reflows, layout shifts, costly painting, and excessive JavaScript execution.

• Establish and enhance measurable performance goals utilizing real-user monitoring, Lighthouse, synthetic testing, Chrome DevTools traces, and business metrics relevant to the product.

• Create performance budgets, dashboards, and alerts.

• Elevate the performance capabilities of the wider organization through technical presentations, workshops, documentation, mentoring, code reviews, and reusable tools.

⛳️ Requirements

• Bachelor’s degree in Computer Science or a related discipline (or equivalent practical experience).

• Extensive knowledge of modern front-end frameworks (React, Angular, Vue, Svelte, etc.), along with TypeScript, JavaScript, HTML, and CSS, particularly in a front-end heavy, high-traffic consumer web application.

• Advanced proficiency with Chrome DevTools, React Profiler, Lighthouse, CPU profiles, flame charts, network waterfalls, and performance traces.

• Senior-level technical leadership capabilities, including the ability to independently identify high-impact tasks, influence architectural decisions, and provide guidance to teams beyond your immediate area.

• Strong comprehension of browser internals, encompassing JavaScript execution, style calculation, layout, painting, rasterization, and compositing.

• Demonstrated experience in enhancing Core Web Vitals, such as Largest Contentful Paint, Interaction to Next Paint, and Cumulative Layout Shift using real-user data.

• Practical experience in diagnosing memory leaks through heap snapshots, allocation profiles, garbage collection analysis, and detection of detached DOM nodes.

• Competence in optimizing rendering, hydration, bundle size, code splitting, main-thread work, third-party scripts, and frontend asset delivery.

🏝️ Benefits

• Competitive salary with performance-based bonuses.

• Fully remote work option available.

• Comprehensive health, vision, dental, and life insurance for you and your dependents, with policy premiums fully covered by the company.

• Long-term and short-term disability insurance.

• Unlimited paid time off (PTO).

• Annual year-end company closure.

• Optional 401k plan with 5% matching.

• 12 paid holidays throughout the year.

• Paid lunches for in-office employees; for remote employees, a stipend of $125 per week via Sharebite.

• Employee Assistance Program (EAP) and employee recognition initiatives.