UK CRO Agency Looking for UI/UX Developer

The Role We're looking for a CRO Designer/Developer to build the tests, custom sections and page changes that come out of our research. You'll work closely with our CRO Strategists, turning strategy and design into shipped, tested code on our clients' Shopify sites. Development is the core of this role - you'll also be capable of design work, but the priority is someone who can build well and build fast. Key Responsibilities 1. Development: Build custom Shopify Liquid sections, theme customisations and bespoke functionality for CRO tests and permanent site changes. Work inside existing, unfamiliar client codebases as often as building from scratch. Use Git for version control across multiple client theme repos. 2. A/B Testing: Build and ship A/B and multivariate test variants using tools like Convert, Intelligems and Shoplift. Understand test infrastructure well enough to avoid flash-of-original-content and other implementation issues that compromise test data. 3. Design: Support the design of landing pages and on-site experiences where needed, working from CRO research and strategy. Judge when a custom build is the right call versus using an existing Shopify app. 4. AI-Assisted Development: Use AI tools, particularly Claude, to speed up development without compromising code quality - this matters as much as raw experience. 5. Collaboration: Work directly with CRO Strategists, designers and the wider team to turn research into live, tested changes. Manage your own workload and timelines with minimal oversight - this is a remote, largely self-directed role. Note: This is not an exhaustive list and you may be required to perform additional tasks from time to time. Requirements Strong experience with Shopify Liquid, custom sections and theme customisation - this is a must. A/B testing experience is a must - you understand test infrastructure, not just the code. Understanding and experience using Git. Strong grasp of the Shopify app ecosystem, with hands-on experience integrating various apps. Experience using AI tools, particularly Claude, to speed up development - this is crucial. Comfortable working independently and remotely, without close supervision. Basic understanding of CRO principles. Design ability is a bonus, not a requirement - development is the priority. Note: No agencies, we are not interested in outsourcing, white labelling or hiring an agency, we are looking for individuals to work with directly.