Senior Frontend Performance Engineer - React (Europe)

About the job

We're hiring Senior Frontend Performance Engineer to build one of the fastest web applications on the market — pushing frontend performance beyond what's possible with standard frameworks. The product is live and used by thousands of users; your job is to make it feel instant at any scale. This is a high-ownership role where performance isn't a side quest — it's a primary business objective. You'll own it across the entire application. What You'll Do Own frontend performance across the entire application — startup time, interaction latency, scrolling, rendering, memory, and perceived performance Design and implement advanced rendering, caching, preloading, and data synchronization systems...