> Markdown version of [/jobs/ext/3243110-windows-systems-administrator-l3](https://www.wearedevelopers.com/jobs/ext/3243110-windows-systems-administrator-l3). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Windows Systems Administrator - L3 - **Company:** Global Relay - **Location:** London, UK - **Experience:** Expert - **Contract:** Permanent contract - **Skills:** Microsoft Windows, Active Directory, Microsoft Outlook, Cyber Security, System Configuration, Dynamic Host Configuration Protocol, Distributed File Systems, Domain Name System (DNS), Microsoft Exchange Server, Failover, Lightweight Directory Access Protocols (LDAP), Microsoft Office, Microsoft Project, Microsoft Visio, System Center Configuration Manager, Windows Servers, Windows PowerShell, Software Deployment, Microsoft Deployment Toolkit - **Published:** September 22, 2026 - **Apply:** https://www.indeed.com/viewjob?jk=dcadfb9164e56a7b ## About the Role * Minimum 3-5 years of direct experience with Exchange and at least 10 years of overall experience in IT administration and advanced computer support * Technology infrastructure design, implementation and management including Microsoft Active Directory, DNS, DHCP, LDAP, MDT, and SCCM * Ability to monitor, test and analyze system activities to ensure maximum performance, efficiency, and availability * Ability to analyze system usage and plan for growth or increases in system capacity * Ability to identify and resolve problems affecting systems performance, efficiency, and availability in a timely manner * Ability to assess the need for any system reconfigurations (minor or significant) * Extensive knowledge of Microsoft Exchange including experience with mailbox server failover and cluster management * Extensive knowledge of Windows server, Active Directory, DNS, DHCP, DFS, DFS-R, File and Print Services, and GPO validation, management, and implementation * Knowledge of Microsoft Exchange PowerShell commands needed to manage Exchange features, roles, mailboxes, performance and troubleshooting * Comfortable with Microsoft Office applications including Microsoft Project and Visio with knowledge of Office Outlook features, configuration and troubleshooting * Experience with troubleshooting & resolving complex technical problems, writes reports and creates documentation processes and procedures * Demonstrated ability to work both collaboratively in a team environment as well as independently in an effective and organized manner in a complex and challenging environment * Comfortable working under pressure in a fast-paced environment * Excellent interpersonal and communication skills in both verbal and written English * Strong organization skill and initiatives * Resourcefulness in problem solving abilities * Knowledge of IP phone systems would be considered an asset * Microsoft MCSA, A+, or MTA certification would be considered an asset This role will require a minimum of 3 days in the office per week, During your first 3 months of employment you may be required to be in the office more often for training. Global Relay is unable to offer visa sponsorship for this position. Candidates must have the right to work in the UK at the time of application. ## Description The Windows Administrator - L3, is a key member of the Operations team and works closely with other System Administrators, Desktop, Security, and Cyber Security Operations Center teams., The Senior Windows Administrator is responsible for the design, management, and support of our Windows environments, with a focus on corporate services for Exchange, Active Directory, and desktop management (GPO, SCCM, MDT, MSI re-packaging)., * Administer corporate Active Directory and Microsoft Exchange environments, act as a SME for other internal and client facing AD & Exchange deployments * Develop, implement, and manage desktop management policies related to securing desktops, applying group policies, and deploying software * Update documentation, write new procedures, and detail Exchange and Active Directory configurations * Deliver timely and high quality incident resolution and post-incident analysis focusing on root cause, prevention, and knowledge transfer * Develop and implement strategies for providing proactive support resulting in fewer incidents, increased availability, or accelerated deployments * Respond in a timely manner to Support and Operations cases related to Exchange, AD or other Windows Server issues * Ensure all Windows systems operate with a high service availability * Ensure that the corporate services adhere to our Business Continuity and Disaster Recovery Programs