Front End Developer - React - JavaScript

Job Title: Lead Front End Developer
Location: Dunton/Basildon Essex
Rate: £550- 600
Start Date: Mid April
Job Type: Contract 9 months

We're looking for an experienced Lead Frontend Developer to join a high-performing team delivering modern, scalable web applications.

This is a hands-on leadership role where you'll take ownership of frontend architecture, drive best practices, and mentor developers to build best-in-class user experiences.

Please note: This role requires 4 days per week on-site in Dunton - this is non-negotiable.

What You'll Be Doing

• Leading the design and development of complex frontend applications
• Building scalable, component-based architectures using React
• Driving engineering best practices across the team (TDD, pair programming, code reviews)
• Mentoring and upskilling developers
• Collaborating closely with product, design, and backend teams
• Contributing to CI/CD pipelines and DevOps processes

What We're Looking For (Essential)

• Strong background in Frontend Development
• Expert-level JavaScript and React experience
• Solid skills in HTML & CSS
• Experience with component-based architecture
• Exposure to DevOps practices (CI/CD, version control e.g. Git)
• Strong experience working in Agile environments (including TDD & pair programming)
• Proven leadership / mentoring experience
• Excellent communication skills

Nice to Have

• Experience with modern testing frameworks (e.g. Jest, Cypress)
• Cloud platform exposure (AWS, Azure, etc.)
• Performance optimisation experience
• Accessibility (a11y) best practices

What's on Offer

• £600 per day
• High-impact leadership role on modern tech stack
• Collaborative, engineering-focused environment

Disclaimer
Notwithstanding any guidelines given to level of experience sought, we will consider candidates from outside this range if they can demonstrate the necessary competencies.
Square One is acting as both an employment agency and an employment business, and is an equal opportunities recruitment business. Square One embraces diversity and will treat everyone equally. Please see our website for our full diversity statement.