Build client-side experiments to exact specification using HTML, CSS, and JavaScript
Work with experimentation platforms to implement and deploy tests
Oversee and conduct final reviews to ensure experiment designs are being followed and coding standards are maintained
Review code from other developers in the development team
Prioritise and fix bugs promptly
Perform technical evaluations to determine if testing scripts will impact existing code
Stay up to date with releases and updates from A/B testing platforms that impact how the development team works with clients
Handle other ad-hoc requests and support the delivery team
Working as a member of a larger team and collaborating effectively with others in your function (developers) as well as cross functionally (designers, project managers, consultants, QA engineers, testers and clients) to support each other, achieve the best outcomes, and win as a team
When required, participate in client calls to discuss technical feasibility, timelines, and troubleshooting
Work within a portfolio model, owning relationships and delivery for 5-10 clients simultaneously
Requirements
3-5 years professional experience with front-end technologies: HTML, CSS, JavaScript
Excellent knowledge of native JavaScript and strong problem-solving skills
Experience with DOM manipulation and client-side script injection
Experience with A/B testing platforms or demonstrable ability to learn technical tools rapidly
Proficient in design tools (e.g. Figma preferred) for development implementation: asset extraction, CSS generation, and element measurement
Proficient use of browser developer tools and console
Understanding of how SPA frameworks (React, Angular, Vue) work - able to inject client-side code without breaking React/Vue applications
Experience in cross-browser/device testing and ensuring consistency
Experience with version control such as GitHub, Bitbucket
An Agile/Scrum developer with 3+ years of experience in an agency or startup environment
**Nice to haves**
Experience with analytics tools such as Google Analytics, Adobe Analytics
Hands-on experience with SPA frameworks (React, Angular, Vue)
Experience with JavaScript build tools such as Webpack, Vite
Experience with back-end technologies: Node, Express, PHP, Laravel
Knowledge of RESTful Services and APIs
Experience with Command Line Interface (CLI) tools
Experience with server-side/full-stack A/B testing tools such as Optimizely Feature Experimentation, Amplitude, LaunchDarkly
Experience with AI development tools
Experience with DevOps using AWS
Experience with Jira
Benefits
Hybrid work environment
Private Medical Insurance
BUPA Life Assurance
Income protection
Employee Assistance Program
Cycle to Work salary sacrifice scheme
Tech & Wearables salary sacrifice scheme
Octopus EV Scheme
Discounts and deals on a range of items from hotels, holidays and hormone testing to cinema, gyms and will writing
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