Senior System Administrator L3

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Job Summary:

Position Overview

Level 3 (L3) Windows System Administrator

Key Responsibilities

Windows & Infrastructure Administration

• Manage, configure, and troubleshoot 

  Windows Server environments

   (AD, DNS, DHCP, Group Policy, File/Print services).
• Maintain 

  virtualized environments

   (Hyper-V, VMware, or Azure Virtual Desktop).
• Perform patch management, upgrades, and system performance optimization.
• Implement backup, disaster recovery, and high-availability strategies.

Microsoft 365 & Azure Administration

• Administer 

  O365 tenant services

   including 

  Exchange Online, Teams, OneDrive, and SharePoint Online

  .
• Manage 

  Azure AD, Conditional Access Policies, Security & Compliance Center

  .
• Configure and maintain 

  Intune MDM/MAM

   for endpoint security and compliance.
• Support 

  hybrid environments

   (on-premises AD + Azure AD Connect).

SharePoint & Power Platform

• Administer and support 

  SharePoint Online/On-Prem

  , including 

  site collections, permissions, and workflows

  .
• Design, implement, and maintain 

  Power Automate (Flow) solutions

   for business process automation.
• Develop 

  Power BI dashboards and reports

   integrating data from multiple sources.
• Collaborate with business stakeholders to optimize collaboration and reporting platforms.

Migration Projects

• Lead and execute 

  migrations to O365, SharePoint Online, and Azure

  .
• Perform 

  email and data migrations

   (Exchange, PST, file shares, SharePoint, legacy systems).
• Ensure minimal downtime and data integrity during migration processes.

Security & Compliance

• Implement 

  identity and access management (IAM)

   best practices.
• Monitor and respond to 

  security alerts and incidents

   across O365/Azure.
• Ensure compliance with regulatory standards (ISO, SOC2, HIPAA, etc.).

Support & Mentorship

• Provide 

  L3 support

   for escalated incidents and problem management.
• Create documentation, SOPs, and runbooks for IT operations.
• Mentor and guide 

  L1/L2 engineers

   in troubleshooting and best practices.

Required Skills & Experience

• 7+ years of experience in 

  Windows Server administration

  .
• 5+ years of hands-on experience with 

  Microsoft 365 & Azure Administration

  .
• Strong knowledge of 

  Active Directory, Group Policy, DNS, DHCP

  .
• Expertise in 

  SharePoint Online/On-Prem

  , 

  Power BI

  , and 

  Power Automate

  .
• Proven track record in 

  O365 / Exchange Online migrations

   and 

  SharePoint migrations

  .
• Experience with 

  Intune, Endpoint Manager, and security tools

  .
• Solid understanding of 

  networking fundamentals (TCP/IP, VPN, firewalls, load balancers)

  .
• Strong scripting skills in 

  PowerShell

   for automation and administration.
• Excellent troubleshooting, analytical, and problem-solving abilities.

Preferred Qualifications

• Microsoft certifications (MCSE, MS-100, MS-101, AZ-104, AZ-305, etc.).
• Experience with 

  hybrid cloud environments

  .
• Familiarity with 

  third-party migration tools (Quest, BitTitan, ShareGate, etc.)

  .
• Knowledge of 

  SIEM, SOC monitoring, and advanced security tools

  .

Soft Skills

• Strong communication and documentation skills.
• Ability to work independently and as part of a global IT team.
• Leadership qualities to mentor and guide junior staff.
• Customer-focused mindset with a commitment to service excellence.