Web Development · Cardiff, United Kingdom
Web Development Agency in Cardiff.
Custom-built, performance-first websites and platforms engineered for speed, security and long-term scale. Cardiff brands compete on a national stage, and digital is a core part of how they win.
What we do
A web development agency in Cardiff built for ambitious brands.
SDM is an independent digital agency working with clients across Cardiff and United Kingdom. We combine strategy, design, engineering and performance in one team, so web development decisions ladder up to real commercial outcomes.
- Headless CMS builds01
- Next.js, TanStack Start, WordPress02
- API and integrations03
- Ecommerce04
- Hosting and support05
- Core Web Vitals06
Why brands in Cardiff choose SDM
Award-winning craft
Recognised by Awwwards, Prestige Awards and the British Business Awards for web development work.
Commercially focused
We measure web development success in pipeline, revenue and share of voice, not vanity metrics.
Local and global
Studios in London and New York, delivering web development for brands in Cardiff and beyond.
Recognition
Recognised for the work. Trusted for the results.
- 2025
British Business Awards
Fastest Growing Marketing Agency
- 2025-2026
Prestige Awards
Marketing Agency Of The Year
- 2022-2026
Awwwards
Site Of The Day (x4)
- 2024-2025
Prestige Awards
Marketing Agency Of The Year
- 2024-2025
CSSWINNER
Site Of The Day (x2)
Other web development locations
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