Shopify Development
Agency 
ECS® is a Shopify development agency in London building custom themes, apps, and Shopify Plus storefronts for ambitious brands. Our developers ship performant Liquid and modern stack work — migrations, integrations, and complex product logic included.
Looking for Shopify developers in London who own outcomes from discovery to launch? You're in the right place.
SHOPIFY DEVELOPMENT
Shopify development agency London
We build Shopify stores that stand up to real traffic, real catalogues, and real ops complexity. As a Shopify development agency, our in-house engineers handle custom theme builds, Plus implementations, app integrations, and technical debt clean-ups — without outsourcing your roadmap to a black box.
Recent builds and rebuilds include Vape Superstore, Nonna Tonda, Eat Unique, and YOM Beauty. For the service-level detail of how we run builds, see Shopify development.
Ready to brief a build? Contact the team or read client reviews.
The ECS® Development Advantage
Technical depth with commercial judgement. Whether you need a greenfield Plus store or a hard refactor of an existing theme, we deliver through:
01
Custom Shopify Plus builds
Enterprise themes, checkout extensibility, markets, and Plus-only capabilities wired to how your business actually sells.02
Theme & Liquid engineering
Online Store 2.0 themes built for speed, maintainability, and conversion — not throwaway Theme Store forks.03
Apps & integrations
ERP, CRM, search, subscriptions, and custom APIs connected cleanly so your storefront stays fast and reliable.04
Migration & modernisation
Platform moves onto Shopify, theme upgrades, and performance refactors that reduce risk while shipping improvements.
BUILT BY SHOPIFY DEVELOPERS
Shopify developers in London
Our development team lives in Shopify daily — Liquid, Online Store 2.0, Checkout Extensibility, Storefront API, and the operational realities of Plus. You get engineers who can explain trade-offs, not just ship tickets.
Need design-led UX as well? Pair this page with our Shopify design agency. Going headless? See headless commerce. After launch, keep momentum with Shopify support.
See what brands say about Shopify development and technical delivery with ECS®.
"Excellent experience with ECS®, helping to build and maintain our site along with various custom apps. Especially good at comms and helping to solve and problems if and when they arise."
"Its been amazing working with you, I can honestly say you are one of the best developers I've worked with."
"The work that they produced was to a really high standard and I would absolutely recommend them."
"Thank you for all your support during Black Friday, we have seen some amazing results!"
"Our main objectives were conversions, site speed and mobile UX. These priorities were executed. I would highly recommend to any brand looking to improve their Shopify Plus site."
"The new site looks fantastic. Orders coming through and everything is running smoothly."
"I can say with complete confidence that you are placed amongst those individuals who know that there is no finish line. You have done yourself proud, and you have excelled at your chosen craft."
"A dream to work with, you completely understood the direction we wanted for our new website and delivered quickly and to the highest quality"
"Amazing! You guys will be doing all our future Shopify developments."
"I was really blown away by the work that ECS® did. Very high quality, with a real focus on flexibility... I would wholeheartedly recommend them."
"After deploying and with the support of Algolia and partner ECS®, the company saw the benefits 'straight away'"
"ECS, it is totally appreciated you are there as others would not be"
"Very helpful, and quick to respond and deal with the issue I was having. Fantastic. Will be using again!"
Frequently Asked Questions
What does a Shopify development agency do?
A Shopify development agency designs and builds the technica...Do you hire Shopify developers in London?
We are a London-based Shopify development agency. Your proje...How is this different from your Shopify development service page?
This page is for brands evaluating a development agency part...Do you work with Shopify Plus?
Yes. Shopify Plus is a core focus — custom themes, checkout ...Can you migrate our store to Shopify?
Yes. We handle migrations onto Shopify / Shopify Plus includ...What happens after launch?
We can hand over cleanly to your team, or continue with reta...BRIEF YOUR
DEV PROJECT