Senior JavaScript Developer

83zero Ltd
Cardiff, United Kingdom
yesterday

Role details

Contract type
Permanent contract
Employment type
Full-time (> 32 hours)
Working hours
Regular working hours
Languages
English
Experience level
Senior
Compensation
£ 80K

Job location

Cardiff, United Kingdom

Tech stack

JavaScript
Artificial Intelligence
HTML5
CSS
Computer Security
Mobile Application Software
Node.js
TypeScript
Web Application Frameworks
GitHub Copilot
React
Express
Vue.js
Angular
NestJS
Es2015

Job description

We're looking for a Senior Full Stack JavaScript Developer to join a fast-moving engineering team building modern web and mobile applications that deliver real impact.

You'll lead technical delivery, mentor engineers, and help shape scalable, secure solutions across projects involving cutting-edge technologies including AI, cybersecurity, and autonomous systems.

What you'll do:

  • Lead and mentor developers, driving engineering best practices
  • Build scalable web & mobile apps using JavaScript, Node.js, React/Angular/Vue
  • Design and develop robust Front End and Back End systems
  • Apply TDD and modern development practices
  • Collaborate with architects, clients, and cross-functional teams
  • Use AI tools (eg GitHub Copilot) to enhance delivery and quality

Requirements

  • Strong full stack JavaScript experience (Node.js + modern frameworks)
  • Experience with Express.js, Nest.js, or Hapi.js
  • Front End expertise in React, Angular, Vue or similar (including Remix.js)
  • Strong HTML5, CSS3, JavaScript (ES6+), TypeScript skills
  • Experience in a senior/lead role with mentoring responsibility
  • Passion for building scalable, high-quality software

Why join us? Work on meaningful, high-impact projects in a flexible, hybrid environment where innovation, collaboration, and wellbeing are genuinely prioritised.

If you're ready to take the lead on exciting engineering challenges, we'd love to hear from you.

Apply for this position