C5 Alliance Group

Established in 1999 and operating as an integral part of BDO Jersey since 2018, C5 Alliance Group is the leading technology solutions provider in the Channel Islands. Supporting over 150 dedicated professionals across Jersey, Guernsey, and the Isle of Man, we deliver enterprise-grade digital transformation and IT services tailored to the unique regulatory and operational landscape of island-based organizations.

Our Core Capabilities

We provide comprehensive, end-to-end technology solutions structured around three expert disciplines:

• Advisory – Digital strategy, business transformation, change management, and strategic consulting.
• Technology – Custom application development, cloud & infrastructure architecture, Island Cloud, AI & advanced analytics, data platforms, and cybersecurity.
• Managed IT Services – Proactive, 24x7x365 SLA-backed support designed to ensure operational continuity and exceptional user experiences.

Strategic Partnerships & Accreditations

Our technical excellence is validated by industry-leading certifications. We are a Microsoft Solutions Partner with multiple Gold competencies, complemented by strategic alliances with HPE, Sophos, Keepit, and N-able. This partner ecosystem allows us to deploy best-in-class tools, maintain rigorous security standards, and accelerate solution delivery.

Industries We Empower

Our solutions underpin mission-critical operations across highly regulated and dynamic sectors:

• Trust & Funds
• Banking & Financial Services
• Utilities & Infrastructure
• Education
• Government & Public Sector

With a proven history of supporting major institutional clients and large-scale public sector initiatives, C5 Alliance Group blends deep local market knowledge with global technology standards. We help organizations innovate securely, optimize their IT environments, and future-proof their operations across the Channel Islands.