Javascript Developer - React-Node-Vanilla

London 2 days agoContractor External
3k - 3.3k / wk
Contract Type: Contractor Location: City of London Industry: IT Contact Name: Scott McCormick Contact Phone: +44 (0)20 7002 0253 Date Published: 09-Feb-2026 My client, a well known publisher, is looking for a Fullstack Javascript Developer to join their team on an initial 6 month contract. They are a dynamic team of 6+ people working across three time zones, solving crucial problems and improving one of the most visited websites in the country. Your role As a Senior Software Engineer, you will be responsible for leading the development of features, as well as providing technical guidance and mentorship to junior and mid-level team members. Your expertise will be crucial in implementing and maintaining scalable and high-performance software solutions that meet the needs of our stakeholders. Who are you? • A software engineer with a passion for writing great code • You enjoy solving complex problems • You are always thinking about the underlying software architecture and how we can continually improve it • You are an advocate of Test Driven Development and understand why it's important • You are comfortable working in an Agile environment and know the value of the agile ceremonies • You collaborate well with others and embrace pair programming • You can understanding of commercial and business requirements • You have worked alongside or within commercial teams before You have • Experience with Functional Programming in Javascript • Experience with Typescript • Experience with React • Experience with Node JS • Experience in testing frameworks such as Jest, Mocha, Enzyme, Cypress • Experience with using Agentic LLM tools such as Github Copilot or Claude Code. • The ability to mentor and coach junior members of the team Bonus if you have • Experience in advertising technology • Experience working for a large publisher • Experience in working with Webpack • Experience with CircleCI • Experience with AWS • Experience creating API’s • Ability to performance test high traffic websites