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Senior Frontend Performance Engineer (React)

Cumi
Remote – Europe Posted Oct 26, 2026
Contract

About this role

Senior Frontend Performance Engineer (React)

Overview

Remote from Europe Contractor mode. Fully remote across Europe

Responsibilities

  • Make a live web app feel instant, at any scale
  • Build custom rendering, caching, and data sync systems where off-the-shelf tools fall short
  • Own startup time, interaction latency, and memory end to end

Requirements

  • 4+ years of frontend work (React, TypeScript, browser internals)
  • A track record of making real apps measurably faster in production

Benefits

  • Not explicitly listed in posting

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