Senior Systems Administrator

Job summary

The Senior Systems Administrator delivers and supports complex solutions across Microsoft 365, Azure, and hybrid on-premises environments, helping keep customer services secure, resilient, and reliable. The role manages Microsoft 365 tenant services, resolves complex third-line issues, implements technical changes, and produces designs and implementation plans. It also involves customer-facing technical leadership, disaster recovery planning, project transitions into support, mentoring, and participation in an out-of-hours rota.

Benefits

Qualifications

• Experience in a senior systems administration, senior infrastructure engineering, or similar third-line role
• Hands-on experience managing Microsoft 365 tenant environments
• Azure knowledge and experience delivering solutions in Azure
• Experience supporting hybrid cloud and on-premises infrastructure
• Knowledge of enterprise systems, Windows infrastructure, and security operations
• Experience delivering complex Microsoft-based technical solutions
• Experience with identity management, multi-factor authentication, and least-privilege access
• Understanding of Zero Trust principles in hybrid environments
• Experience producing low-level designs and technical documentation
• Relevant Microsoft or ITIL qualifications, or equivalent experience

Responsibilities

• Manage and support Microsoft 365 tenant services, including Intune, Entra ID, SharePoint, OneDrive, and Teams
• Deliver solutions across Azure, Microsoft 365, and on-premises environments
• Provide third-line support for complex infrastructure and application issues
• Plan and implement technical changes, upgrades, and new solutions
• Complete impact assessments and prepare implementation, testing, and contingency plans
• Work with customers to clarify technical requirements and expected outcomes
• Lead customer-facing technical discussions and contribute to workshops
• Investigate service failures using documentation, system information, and event logs
• Coordinate with suppliers to identify, test, and implement lasting resolutions
• Prepare low-level designs, change requests, procedures, and technical work packages
• Support disaster recovery planning and secure, resilient services
• Transition completed projects into business-as-usual support
• Share technical knowledge and mentor team members
• Participate in the scheduled out-of-hours support rota

Skills

Certifications

Work schedule

Travel

Industry

Relocation