Senior Frontend Engineer (Performance)

About Multi Media, LLC 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.

The Role 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.

What You’ll Do 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.