If you are an experienced JavaScript Developer we have a new position we would like to discuss with you. Please note this role requires 5 days per week onsite in Upminster, Essex. You will lead the development and management of a portfolio of websites that support marketing campaigns, client acquisition, and partner integrations. This is a hands-on technical role where you will have significant autonomy to improve and develop our platforms, implement new systems, and shape how our websites operate as the business expands. You will work closely with our marketing team to improve tracking, conversion performance, and campaign delivery across multiple brands and affiliate channels. Essential Skills and Experience Strong experience with CSS3, JavaScript, and React. Experience with Back End development and SQL databases. Experience implementing REST APIs and working with JSON/XML data formats. Experience with Google Analytics and conversion/lead tracking systems. Experience building responsive, high-performing websites. Strong understanding of UI/UX and conversion optimisation Strong understanding of data types and validation Ability to work independently and manage multiple development projects and strong attention to detail Desirable Experience Experience managing web hosting infrastructure and Linux environments. Experience with workflow tools such as Jira. Experience with reporting platforms (Metabase, Grafana). Understanding of SEO and technical site optimisation. Awarenes