Onlano
ReactOnsite

Senior Front End Engineer - JavaScript & React

Client Server - Recruiter

The City, Central London, ๐Ÿ‡ฌ๐Ÿ‡ง United KingdomFull-time - Senior (4-7 years)0 applicantsCloses Jun 20, 2026

Salary

GBP 85,000 - 85,000 / year

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Job description

Job details

  • Location: The City, Central London
  • Work mode: Onsite
  • Employment type: Full-time (Not an internship)
  • Salary: GBP 85,000 per year

Role overview

Client Server is hiring a Senior Front End Engineer with strong JavaScript and React expertise to join their team in Central London. This full-time, onsite role offers ยฃ85,000 per year and focuses on building modern web applications using AI-assisted development workflows. The position suits engineers from start-up or small business backgrounds who value collaboration and clean code architecture.

Job details

This is a full-time, onsite position based in The City, Central London. The salary is ยฃ85,000 per year (GBP). You will work with cutting-edge AI tools like Claude to accelerate development, apply computer science fundamentals to solve complex problems, and contribute to a dynamic engineering culture that values communication and teamwork.

Responsibilities

  • Build and maintain React-based front end applications using modern JavaScript
  • Integrate AI tools like Claude into daily development workflows
  • Apply object-oriented programming and design patterns to front end architecture
  • Collaborate with cross-functional teams to deliver high-quality features
  • Optimize performance and ensure code quality through best practices

Requirements

  • Strong object-oriented JavaScript and React development skills
  • Experience working in start-up or small business environments
  • Solid understanding of computer science fundamentals including OOP and data structures
  • Comfortable using AI tools such as Claude in everyday workflow
  • Excellent communication and collaboration skills

Benefits

  • Competitive ยฃ85,000 salary
  • Work with cutting-edge AI development tools
  • Central London location
  • Dynamic start-up culture

Keywords

JavaScriptReactFront EndAI ToolsClaudeOOPData StructuresDesign PatternsStart-upWeb Development