Front End Developer - JavaScript (x2) - England - London

£35,000 - £45,000 - Apps - Front-End Development
Ref: 34 Date Posted: Wednesday 20 Nov 2019
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Job Summary:

A skilled front-end web developer is required to join our Front-End team producing innovative sports betting products in Central London.

Experience working in the sports betting / gaming industry would be beneficial but not a must. The ideal candidate will be joining and collaborating with the existing front-end team.

Demonstrating the ability to work across different areas and stages of web product development: understanding business requirements; JavaScript development; testing; applying changes to customer environments.

Responsibilities and Duties:

  • Developing new features within the existing product framework by applying appropriate coding patterns
  • Identifying and fixing bugs
  • Accurately estimating own development work
  • End-to-end testing
  • Reviewing other developer's code and mentoring less senior developers
  • Handling direct customer contact on occasion
  • Performing live customer releases
  • Providing third tier technical support (including out of normal office hours as required)

Skills and qualifications:


  • Good JavaScript ES6 specification knowledge
  • Experience of testing methodologies, ideally using Jest or other JavaScript unit tests
  • Understanding of good website design and mobile-first principles
  • Understanding of JavaScript bundler processes (CommonJS, AMD, ES6)
  • GitHub


  • Understanding of SEO considerations and conversion/retention pixel-based tracking systems
  • Marionette (Backbone) framework
  • WebSockets
  • Ext JS (Sencha)
  • Cordova


  • JavaScript ES6: 2 years (Required)


  • Bachelor's (Preferred)