About Simon Antony

Simon Antony Limited is an Umbraco Silver Partner agency based in Llandudno, North Wales, one of fewer than 100 Umbraco Silver Partners worldwide. Founded in 2008, the company is led by Simon Steed, an Umbraco Certified Master with over 20 years of professional .NET development experience spanning infrastructure, software engineering, and technical leadership.

We specialise exclusively in Umbraco CMS development, support, and optimisation. Our client portfolio spans healthcare (NHS), charity (British Red Cross), telecoms (Vodafone via Yes Telecom), recruitment, marine science, and professional services, built almost entirely through referrals and repeat business over 17 years.

According to BuiltWith, Umbraco powers over 730,000 live websites globally. As certified specialists, we bring deep platform knowledge that generalist agencies simply cannot match. We've delivered Umbraco solutions across every major version from v4 through v17, making us one of the most experienced Umbraco teams in the UK relative to our size.

Our work falls into four areas, all centred on the Umbraco platform:

Custom Umbraco development — Bespoke website builds on ASP.NET Core using C#, Razor views, and Umbraco's composition-based content architecture. We work directly with clients and as a white-label development partner for other agencies who need certified Umbraco expertise without hiring in-house.

Umbraco migrations and upgrades — Moving sites to Umbraco from WordPress, Sitecore, Classic ASP, and older Umbraco versions. Our blog post on Umbraco 8-to-13/17 migration has become a reference resource in the Umbraco community.

Performance audits and optimisation — Comprehensive technical audits covering Core Web Vitals, security headers, schema markup, and AI search readiness. Our clients average a 40% improvement in Lighthouse performance scores within 30 days.

Ongoing retainer support — Flexible monthly plans covering security patching, version upgrades, performance monitoring, and ad-hoc development. Most retainer clients have been with us for over three years.