Senior Frontend Engineer (Performance)

Multi Media, LLC is a global technology company operating a high-traffic live-streaming platform used by millions of people around the world. Behind the experience is a team solving challenging problems in real-time video, scalability, reliability, data, machine learning, and user experience.

We’re a place for people who want their work to matter. Our teams have the autonomy to make decisions, the opportunity to work on problems at meaningful scale, and the ability to see their work shape experiences for a global audience in real time. We value curiosity, ownership, collaboration, and continuous improvement.

We are looking for a Senior Frontend Engineer who specializes in frontend performance tuning and optimization. You will join the Viewer team, which is responsible for delivering high-traffic experiences across search, video, site navigation, and other core areas of our platform.

This role requires deeper performance expertise than a typical frontend engineering position. You will investigate how browsers execute and render our applications, profile production bottlenecks, analyze memory usage, and identify the code paths causing delays or instability. As the role evolves, you may have opportunities to apply your expertise to other high-impact frontend experiences and help shape how we approach performance across Engineering.

• Diagnosing, triaging, and leading to resolution issues involving unnecessary renders, long tasks, memory leaks, forced reflows, layout shifts, expensive painting, and excessive JavaScript execution.
• Define and improve measurable performance targets using real-user monitoring, Lighthouse, synthetic testing, Chrome DevTools traces, and product-level business metrics.
• Establish performance budgets, dashboards, and alerts
• Raise the performance capabilities of the broader organization through technical talks, workshops, documentation, mentoring, code reviews, and reusable tooling.

• Bachelor’s degree in Computer Science or related field (or equivalent practical experience)
• Deep expertise in modern front-end frameworks (React, Angular, Vue, Svelte, etc), TypeScript, JavaScript, HTML, and CSS, with experience operating in a front-end heavy high-traffic consumer web application.
• Expert-level proficiency with Chrome DevTools, React Profiler, Lighthouse, CPU profiles, flame charts, network waterfalls, and performance traces.
• Senior-level technical leadership skills, including identifying high-impact work independently, influencing architecture decisions, and advising teams outside your immediate area
• Strong understanding of browser internals, including JavaScript execution, style calculation, layout, painting, rasterization, and compositing
• Proven experience improving Core Web Vitals, including Largest Contentful Paint, Interaction to Next Paint, and Cumulative Layout Shift using real-user data.
• Hands-on experience diagnosing memory leaks using heap snapshots, allocation profiles, garbage-collection analysis, and detached DOM-node detection.
• Ability to optimize rendering, hydration, bundle size, code splitting, main-thread work, third-party scripts, and frontend asset delivery.

• Competitive compensation with performance bonuses
• Fully remote option
• Health, vision, dental, and life insurance for you and any dependents, with policy premiums covered by the company
• Long- & short-term disability insurance
• Unlimited PTO
• Annual year-end company closure
• Optional 401k with 5% matching
• 12 paid holidays
• Paid lunches in-office; if remote, a $125/week stipend via Sharebite
• EAP and employee recognition programs

The base salary range for this position is $180,000 - $215,000 annually. Range reflects base salary only. It does not include additional compensation or benefits. The range displayed reflects the minimum and maximum range for a new hire across the U.S. for the posted position. A candidate's specific pay will be determined on a case-by-case basis and may vary based on the candidate's job-related skills, relevant education, training, experience, certifications, and abilities of the candidate, as well as other factors unique to each candidate.

Multi Media, LLC is an equal opportunity employer and values diversity at our company. We do not discriminate on the basis of race, religion, color, national origin, gender, sexual orientation, age, marital status, veteran status, or disability status. #LI-MMLLC