Senior IT Infrastructure Administrator

The Senior IT Infrastructure Engineer (SITE) is responsible for the operation, security and lifecycle management of Digicel’s on premises and hybrid (Microsoft Azure / Microsoft 365) server infrastructure in support of the global business. This includes all Group Head Office IT requirements as well as technical support to the technology teams across Digicel’s operating markets. The SITE works as a member of a team of engineers delivering first-class technology services on the Microsoft platform, including current Windows Server releases, Active Directory and Microsoft Entra ID hybrid identity, and Microsoft 365. The role includes on-site physical support for technology solutions deployed across Digicel’s Tier III data centres, including SAN storage, backup and other high-availability infrastructure. A significant portion of the infrastructure estate runs on Linux and Unix. Strong experience supporting enterprise Linux distributions (e.g., Red Hat Enterprise Linux and RHEL-compatible distributions) and Unix platforms is key to success in this role. 

Duties and Responsibilities:

• Microsoft Infrastructure Services – evaluate and manage all on-premises Microsoft infrastructure services, including Active Directory Domain Services (AD DS), DNS, DHCP, Network Policy Server (NPS), Active Directory Certificate Services (AD CS), SMTP mail relay and Remote Desktop Services (RDS)
• Identity and Access Management – manage hybrid identity across Active Directory and Microsoft Entra ID, including directory synchronisation, conditional access and multi-factor authentication in coordination with Group Security; execute joiner/mover/leaver access changes and privileged-access controls in line with Group IT access-control procedures
• Wi-Fi Services – manage all corporate Wi-Fi services (Cisco Meraki) and related network equipment to ensure consistent, reliable connectivity for users
• Virtualization – manage virtual server environments, including Microsoft Hyper-V and VMware vSphere, covering host lifecycle, capacity and licensing
• Microsoft 365 Administration – administer Microsoft 365 through the Microsoft 365 admin center and related admin portals; own the processes for subscription and license allocation across the markets and monitor license utilization; evaluate and coordinate upgrades, environment changes and maintenance work with Global IT Administrators
• Endpoint and Server Management – manage patch, software and configuration deployment using Microsoft Configuration Manager and/or Microsoft Intune
• Backup and Recovery – ensure server and data backups are configured, monitored and restore-tested; support disaster recovery testing for critical systems
• Monitoring and Reporting – evaluate, implement and manage infrastructure monitoring and reporting solutions to ensure all critical systems are under appropriate management, including remote management and SNMP integration with the Global Network Operations Centre (GNOC)
• Certificate Management (SSL/TLS) – manage the full lifecycle of certificates issued by the internal certificate authority (AD CS) and external public certificate providers; maintain a certificate inventory and assist market technology teams with timely renewals and installations to prevent expiry-related outages
• Incident and Problem Management – provide troubleshooting expertise to resolve issues without vendor escalation where possible; raise and drive Microsoft and other vendor support cases to resolution; coordinate internal stakeholders and suppliers to restore service efficiently; complete root cause analysis (RCA) for major incidents
• Systems Administration – manage Active Directory objects, file share and print services in collaboration with the IT Service Desk team
• Change Management – plan and execute production changes through the approved change management process, including maintenance windows, implementation and rollback plans. • Health, Performance and Stability – conduct routine health checks and proactive maintenance to ensure the availability and reliability of systems; maintain the uptime and performance of servers and network services through an approved patching and performance regime
• Capacity and Lifecycle Management – participate in capacity planning, migration and design activities for solutions dependent on IT infrastructure; identify end-of-life hardware and software and support its upgrade, migration or Revised: September 2026 Classification: Public decommission
• Automation – develop and maintain scripts (PowerShell, Bash) to automate routine administration, reporting and compliance tasks
• Security, Vulnerability and Compliance – ensure systems are hardened and vulnerabilities remediated as directed by the Group Security team; support the continuance of Digicel’s ISO/IEC 27001 certification and IT general controls (ITGC) audits, including the provision of audit evidence
• IT Assets and Documentation – maintain an up-to-date inventory of servers, compute and on-premises storage infrastructure, together with current system documentation and runbooks; administer corporate network assets in coordination with the IT Service Desk team
• AI Enablement and Automation – support the secure deployment and administration of AI-enabled platforms and services (e.g., Microsoft 365 Copilot), including readiness assessments, licensing, permissions and data-access controls, in coordination with Group Security; use AI-assisted tools to improve automation, monitoring, troubleshooting and documentation, in line with Group AI and data governance policies

Academic Qualifications and Experience Required: 

• Bachelor’s degree in Information Technology, Computer Science or a related field
• 5+ years of progressive experience in enterprise infrastructure engineering or a similar role
• Microsoft role-based certification(s) such as Windows Server Hybrid Administrator Associate (AZ-800/AZ-801), Azure Administrator Associate (AZ-104) or Microsoft 365 Administrator (MS-102) would be an asset
• Red Hat Certified System Administrator (RHCSA) or equivalent Linux certification would be an asset
• ITIL 5 Foundation certification is desirable
• Experience with Microsoft Configuration Manager and/or Microsoft Intune would be an asset
• Knowledge of Cisco Meraki wireless solutions is preferred
• Experience with email and file archiving and retention solutions (e.g., Microsoft Purview) is desirable
• Working knowledge of Microsoft Azure infrastructure services to support hybrid operations and cloud migration initiatives
• Familiarity with AI-enabled IT operations tools (e.g., Microsoft Copilot, AIOps/AI-assisted monitoring) and the security and data-governance considerations for enterprise AI adoption is an asset
• An acceptable combination of academic qualifications and work experience may be considered in lieu of the minimum requirements

Functional Skills: