About
Hi, I'm Warren.
Warren (Tom) Carter, Shopify Developer
I'm the Tom behind builtbytom (it's my middle name).
I'm a Shopify developer with over 16 years in web development, the last 8 spent working exclusively on Shopify. I help eCommerce brands build storefronts that are fast, reliable and built to convert, and then keep improving them once they're live.
Most of my background is in bespoke Shopify 2.0 theme development, taking designs from Figma through to launch. These days, much of my work happens after launch. I audit performance, dig into behaviour and error data, and turn what I find into practical changes that make a measurable difference to how a store performs.
I work directly with every client. There are no account managers or hand-offs, just one experienced developer who cares about getting it right.
Services
What I can help with
Performance and Core Web Vitals
Faster load times, better LCP and CLS, and smarter image delivery.
Behaviour and error analysis
Using tools like Microsoft Clarity, Hotjar and Lighthouse to find where customers get stuck.
Custom theme development
Clean, flexible Liquid and JSON templates with reusable sections your team can manage.
Conversion features
Upsells, subscriptions and loyalty programmes.
App integrations
Klaviyo, Recharge and more, set up properly so they don't slow your store down.
Accessibility and UX
Smoother, more inclusive product and cart journeys.
Currently available for freelance and contract work. If you'd like to build, improve or speed up your Shopify store, get in touch. I'd love to hear what you're working on.
Have a project in mind? Let's talk.
Tell me what you're building, and I'll help shape the right approach.