Edward O'Callaghan
Highly experienced and solutions-driven IT professional with over 20 years' experience
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About
Highly experienced and solutions-driven IT professional with over 20 years' experience across infrastructure, desktop support, database administration and application support within secure, complex and operationally critical environments. Currently holding SC Security Clearance valid until 2032, with previous DV Security Clearance gained while supporting a National Crime Agency client during employment with CGI. BTL1 Cyber Security qualified, achieved during the Sizewell B assignment.
Experienced in troubleshooting complex technical issues, maintaining critical IT services and supporting users across demanding operational environments.
Experience
Desktop & Infrastructure Engineer at Sizewell B Morton's (2025-07 – 2026-08)
Provided desktop, infrastructure and IT operational support within the secure and operationally critical Sizewell B environment.
- Supported a broad range of technologies across end-user computing, infrastructure and core IT services.
- Maintained critical IT services, helping ensure the availability, reliability and continuity of essential IT operations.
- Diagnosed and resolved hardware, software, connectivity and infrastructure-related incidents, minimising disruption to users and business operations.
- Worked across desktop support and infrastructure activities, responding to incidents, service requests and technical issues in accordance with established procedures.
- Collaborated with technical teams and stakeholders to investigate and resolve complex issues and maintain effective IT service delivery.
- Achieved BTL1 Cyber Security during the assignment.
- Contract initially agreed for six months and extended twice, continuing through to August 2026.
Database Administrator / Technical Solutions Engineer at CGI Ltd (2006-01 – 2025-12)
- Supported and maintained over 1,000 SQL Server databases (2000–2022) across enterprise and secure government systems.
- Provided technical support to clients operating within highly secure and sensitive environments, including the National Crime Agency.
- Held DV Security Clearance while supporting a National Crime Agency client.
- Delivered system upgrades, software migrations and data replication (Snapshot & Transactional).
- Installed and configured applications including reporting platforms (SSRS, SSIS) and bespoke services.
- Provided remote support, troubleshooting and root-cause analysis for client-facing application environments.
- Worked closely with end users and developers to ensure software integrity and performance tuning.
- Contributed to system design, hardware/software implementation and infrastructure recommendations.
Application & Network Support Analyst at Unisys / Logica (2001-01 – 2006-12)
- Supported Ministry of Justice applications across secured sites.
- Managed Exchange server migrations, office relocations and infrastructure deployments.
- Delivered user support and troubleshooting across networked environments.
- Assisted with documentation, project tracking and software installations.
IT Helpdesk Analyst at Unisys (1997-01 – 2001-12)
- Delivered 1st line support across MS Office and bespoke government applications.
- Created technical documentation and resolved software-related tickets.
- Provided guidance and training to non-technical end users.
Education
BTEC Higher Certificate in Business & Finance – Highbury College of Technology
GCSEs – Royal Hospital School, Suffolk
