Intermediate React Developer (React.js/JavaScript)

About the role

Global Relay is looking for an Intermediate React Developer to join a small, focused team building modern, sophisticated web applications. You will work alongside experienced developers in London, contributing to end‑to‑end system solutions while maintaining high standards of code quality, performance, and security.

Key responsibilities

• Design and implement fully‑interactive single‑page web applications using React.js.
• Write unit and integration tests for JavaScript code.
• Collaborate with interaction designers to turn mock‑ups into accessible, responsive interfaces.
• Work with testers to develop test cases for JavaScript components.
• Partner with product owners on user story creation and refinement.
• Participate in knowledge‑sharing activities within the team.

Required profile

• Minimum 3 years of JavaScript development experience in an Agile environment.
• Strong knowledge of React.js, HTML5, CSS3 and related web technologies.
• Experience building web applications that consume web service APIs.
• Proven ability to write functional tests using web testing frameworks.

Required skills

• React.js
• JavaScript (ES6+)
• HTML5
• CSS3
• Sass / Less
• AJAX
• JSON
• Mocha
• Jasmine
• Jest
• Selenium
• Linux
• ExtJS (optional)
• Angular (optional)
• Vue.js (optional)

What we offer

• Competitive compensation and benefits.
• Opportunities for professional growth and innovation.
• A collaborative, inclusive work environment.