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Infor SunSystems

A comprehensive financial management solution from Infor that delivers real-time financial, operational, budgeting, forecasting and reporting capabilities across your organisation.

QlikView & Qlik Sense

A complete data discovery offering where QlikView delivers guided analytics and Qlik Sense empowers users with intuitive self-service visualisation to drive insightful decision making.

Microsoft Dynamics NAV & CRM

Industry tailored business management software, built on Microsoft Dynamics NAV, meets your needs today and as your business grows. Dynamics CRM delivers unique control and helps streamline your business processes.

Pegasus Software

Opera 3 is a powerful end-to-end financial management solution for small to medium-sized businesses, which reduces the need for separate finance, payroll, CRM, supply chain or service systems.

Cloud & Managed Services

We implement and support a range of solutions, from public, private or hybrid cloud, depending on your business requirements. All of our applications can be delivered from the cloud or on premise.


We work in partnership with Citrix, VMware and Microsoft to deliver the latest technologies to give your organisation control and choice while driving efficiencies.

Infrastructure Services

Our range of comprehensive infrastructure services help deliver optimal performance of your IT environment to ensure business agility, flexibility and security.

Business Continuity

Ensure your business remains operational whatever the circumstances by backing up business critical information to our UK-based data centre.

The Castle Difference

"We have worked with Castle for many years and they have always demonstrated a high level of expertise in SunSystems, particularly in the housing sector. Any issues that arose during the implementation were quickly resolved and Castle has always been prepared to be flexible in order to meet our needs."

Ian Harrington, Finance Manager, Blackwood Homes


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.