Company: Underwaterpistol (Shopify Plus Agency)
Location:
Posted: April 11th, 2026
Location: 1 day remote + 1 day on-site in London
Contract: Freelance, approx. 3-month rolling project
Rate: £250 - £350 per day
Start: ASAP
Reports to: Technical Lead
We’re looking for an experienced Senior Developer to join us on a short‑term freelance basis, working directly on‑site with our London‑based clients two days a week. We’re looking for a self‑motivated Senior Developer who’s confident in client‑facing environments, able to advocate for the best use of their time, and skilled in shaping tasks as well as delivering work autonomously.
You’ll help bring high‑impact e‑commerce projects to life, turning design concepts into fast, accessible and beautiful experiences that perform flawlessly.
We’re Underwaterpistol, a creative and technical e‑commerce agency built for brands that want to stand out. We design, build and grow Shopify Plus stores that deliver measurable results, blending creative thinking with technical precision.
Our developers care deeply about quality, detail, and craft and we’re looking for someone who shares that mindset.
This role involves working closely with our clients on‑site, acting as a trusted technical partner. You’ll be responsible for shaping your workload, managing priorities directly with client teams as their primary solo developer and representing UWP with confidence and clarity.
As a Senior Developer, you’ll lead the build and implementation of front‑end features, ensuring clean, reusable code and seamless collaboration with designers and strategists. You’ll be hands‑on in translating UI/UX concepts into working digital experiences, maintaining our high standards for accessibility, performance, and maintainability.
You’ll need to be comfortable working independently, shaping tasks proactively, and advocating for the most effective use of development time in a client‑facing setting.
Essential
Nice to Have