FX are a Digital Agency with a growing reputation for being a cutting-edge team that create exciting interactive experiences. We are looking for a Senior Front End Developer to join the fast growing team in Shoreditch, London.

A Senior Javascript Developer at FX helps to pioneer and develop innovative Javascript products across multiple platforms including TV, Voice and Web. Utilising their experience and expertise to architect technical solutions, they advise and support the growth of individuals, helping to review the development team’s work and sharing knowledge. They work closely with the Lead Developer and Technical Director to scope work and see it through to execution and completion, and are confident enough to suggest solutions to clients when called upon. A Senior Javascript Developer at FX will have 3+ years of experience with Javascript and be confident in their knowledge to make decisions and drive the direction of development work at FX.


  • Working with the Technical Director and Lead Developer to propose technical solutions to business problems, attending client meetings where required
  • Leading the Javascript development of TV and console applications
  • Working with the sales and marketing team to propose technical solutions to clients problems
  • Providing inspiration and guidance to help other members of the development team
  • Regularly code reviewing pull requests by the development team, commenting on where improvements can be made and enforcing the appropriate coding standards
  • Advising the Lead Developer as to the tools and services that could be used to help improve the efficiency of the development team
  • Attending industry events to broaden understanding of development tools and processes
  • Attending training and events to ensure continued self improvement
  • Maintaining a research and development attitude towards work


  • 3+ years of relevant professional experience of working in a wider team with multiple concurrent projects
  • Expert understanding of vanilla Javascript and knowledge of frameworks such as React
  • Advanced proficiency with JSON, especially when used in an API context
  • Advanced proficiency working with HTML and CSS
  • Advanced understanding of web architecture including transfer protocols and the makeup of a browser
  • Expert knowledge of Git version control and knowledge of Git flow
  • Confident usage of CLI tools for front-end workflow, including Yarn, NPM, and Gulp
  • Some understanding of CI/CD and tools such as Jenkins or Travis
  • Deep understanding of web inspection tools, along with web profiling and step debugging
  • A willingness and aptitude to change, with a passion to pick up new tools and processes
  • Effective time-management skills
  • Deep understanding of APIs, including RESTful APIs
  • Some familiarity with writing automation testing including unit tests, and a desire for test driven development

Not essential but a plus if you have…

  • Knowledge of working with back-end languages including PHP and Node.js.
  • Experience working with Connected Devices and in particular Smart TVs
  • Experience developing on the Playstation and/or Xbox platform
  • Familiarity with with Jasmine for unit testing
  • An understanding of HTML video players and their technical requirements
  • Experience working with Typescript
  • An ability to curate an incredible Friday afternoon office playlist.

For a full job spec, please see here: https://fxdigital.uk/jobs/SeniorFrontEndDeveloper_JobSpec_FX.pdf

Tagged as: javascript

Cntrl/Cmd + Click to attach multiple files.
I confirm I am based in the UK and DO NOT require sponsorship.