Front End Engineer React Senior / Lead

Company: Client Server
Apply for the Front End Engineer React Senior / Lead
Location: London
Job Description:

Overview

As a Lead Front End Engineer, you own the frontend for the core product, a financial operating system for live events. You will shape architecture, drive performance and scalability, and stay hands-on with React development. You’ll work closely with product, design and backend teams to translate requirements into polished, responsive interfaces and integrate APIs, payments and real-time data. You’ll make critical technical decisions on tooling and build pipelines, and mentor junior engineers to uphold best practices. This role combines technical leadership with hands-on delivery in a fast-growing scale-up.

Pay / Benefits

  • Pension
  • potential equity
  • salary to 90k
  • career progression as company scales

Responsibilities

  • Lead the architecture and development of front end applications using React
  • Collaborate with product and design teams to deliver accessible, responsive UIs
  • Partner with backend engineers to integrate APIs, payments and real-time data
  • Own front end tooling, architecture and build/release pipelines
  • Mentor junior frontend developers, conduct code reviews, ensure best practices
  • Maintain performance, maintainability and scalability across web products

Key requirements

  • Lead or senior Front End Engineer / Developer experience
  • Advanced React skills
  • Strong knowledge of modern JavaScript/TypeScript
  • Component-driven architecture and state management (e.g. Redux, Context API)
  • Experience building responsive, cross-browser, high-performance web apps at scale
  • Comfort with ownership and technical decision-making
  • Thrives in a start-up/scale-up environment with ambiguity
  • Excellent communication and collaboration skills
  • excellent communication
  • collaboration
  • ownership
  • React
  • JavaScript/TypeScript
  • Redux or Context API

…

Posted: October 1st, 2026