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Infor SunSystems

Infor SunSystems is a comprehensive, global financial management system that works the way you want it to, so when your business changes, your system can keep up.

QlikView & Qlik Sense

The QlikView Business Discovery platform delivers true self-service Business Intelligence that empowers users by driving innovative decision-making.

Microsoft Dynamics NAV & CRM

Our Microsoft Dynamics NAV & CRM solutions provide comprehensive core business management functionality, including financials, reporting, supply chain management, service management and more.

Pegasus Software

Pegasus' flagship solution, Opera 3, is a fully integrated accounting and business system that eliminates the need to run separate finance, payroll, and CRM or service systems.

Cloud & Managed Services

Castle works closely with organisations throughout the UK, providing high performance, tailored cloud solutions.

Server & Desktop Virtualisation

Deliver a better service to your users and save on infrastructure costs with virtualisation solutions from market leaders Citrix and VMWare.

Infrastructure Refresh

If you've virtualised your estate three or four years ago, or are thinking of doing it for the first time, there are significant performance and cost benefits to be had from refreshing your hardware.

Business Continuity

Replication of your physical or virtual server environment to our highly resilient, secure Data Centre.

The Castle Difference

"Castle assisted us in fully scoping and planning the project and subsequently demonstrated their broad range of in-depth technical knowledge working closely with our team to ensure that what was scoped was delivered on time and within budget."

Ann Leatherbarrow, IT Supervisor, Macphie of Glenbervie


We go further than anyone else when it comes to listening to our customers' needs and aspirations, engaging in a business discovery exercise at the outset of our relationship.


Combining understanding with technical expertise enables us to deliver innovative solutions. As a result, our clients receive functionality from Castle that cannot be found elsewhere.


Castle's working environment and structure encourages inspiration by enabling staff to pursue their ideas. Our empowered problem solving approach generates new products, new services and new ways of doing things.