Senior Systems Administrator

Quick Facts

• On-site role at the client’s office
• Focus: administration and security of IT infrastructure in a Microsoft environment

Description

You will administer Windows Server and Linux environments and manage identity and network services, Microsoft 365, and related infrastructure components. The role emphasizes root-cause troubleshooting, impact assessment of changes, and preventive improvements rather than only handling tickets. You will also support DEV/TEST/PROD operations, harden systems, automate administration with PowerShell, and maintain technical documentation.

Responsibilities

• Administer Windows Server and Linux environments
• Manage Active Directory/Entra ID services and related components (ADFS, DNS, DHCP, GPO, DFS, IIS, RDS, PKI)
• Manage Microsoft 365 (Admin Center, Exchange Online, SharePoint, Teams, Defender)
• Administer MS Exchange
• Plan and perform service activities across DEV/TEST/PROD environments
• Harden operating systems and ensure infrastructure security
• Perform system migrations and build IaaS-style environments
• Monitor the IT environment
• Automate administrative tasks with PowerShell
• Support application development teams during deployment/rollout activities
• Diagnose problems, analyze root causes, implement solutions, and prevent recurrence
• Create and update technical documentation
• Collaborate with internal business clients and external vendors

Requirements

• Practical experience administering Windows Server
• Very good knowledge of ADDS, Entra ID, ADFS, DHCP, GPO, DNS, DFS, and IIS
• Practical, documented PowerShell knowledge with automation use
• Knowledge of Microsoft 365, especially Admin Center, Exchange Online, SharePoint, Teams, and Defender
• Basic networking knowledge for effective troubleshooting
• Understanding of how administrative changes affect other infrastructure components
• Ability to independently analyze incidents: determine cause, solution method, and preventive actions
• Commitment to standards, technical documentation, and naming conventions
• Knowledge of ITIL processes
• Ability to work independently and with a team
• English sufficient to use technical documentation
• Higher education in IT or related field (or in-progress studies)

Benefits

• Stable cooperation
• Work with experienced specialists and opportunities to build technical competencies
• Access to modern technologies and tools
• Flexible forms of cooperation
• Friendly, collaboration-based work environment
• Career development and knowledge-sharing opportunities