Senior Systems Engineer

Job Description – Windows L3 System Administrator (Terraform & Cloud Automation)

Job Summary

The Windows L3 System Administrator is responsible for advanced administration, engineering, automation, and support of enterprise Windows Server environments across on-premises and cloud platforms. This role serves as the highest technical escalation point for Windows infrastructure, driving automation through Terraform, supporting cloud-native deployments, ensuring platform stability, and leading complex troubleshooting, migration, and modernization initiatives.

Key Responsibilities

• Provide L3-level support for Microsoft Windows Server environments (2016, 2019, 2022 and later versions).
• Act as the final escalation point for complex Windows OS, Active Directory, and infrastructure-related incidents.
• Design, deploy, and maintain highly available Windows server infrastructures.
• Develop and manage Infrastructure as Code (IaC) solutions using Terraform.
• Create and maintain reusable Terraform modules for cloud and on-premise infrastructure deployments.
• Automate server provisioning, configuration, and infrastructure lifecycle management.
• Support Microsoft Active Directory, Group Policy, DNS, DHCP, DFS, and Windows Failover Clustering.
• Lead Windows OS upgrades, patching, security remediation, and lifecycle management activities.
• Implement and support cloud infrastructure on Azure and AWS using Terraform and automation tools.
• Administer virtualization platforms including VMware and Hyper-V.
• Perform performance tuning, capacity planning, and system optimization.
• Manage enterprise backup, disaster recovery, and business continuity solutions.
• Troubleshoot server, storage, networking, and application-related issues.
• Collaborate with application, database, network, cloud, and security teams on infrastructure solutions.
• Drive security hardening initiatives and ensure compliance with corporate and regulatory requirements.
• Lead Major Incident Management (MIM), Root Cause Analysis (RCA), and Problem Management activities.
• Develop automation using PowerShell, Terraform, and other enterprise automation tools.
• Mentor L1/L2 engineers and contribute to SOPs, standards, and knowledge management.
• Participate in 24x7 on-call support and planned maintenance activities.

Required Skills & Experience

• 8–10+ years of enterprise Windows Server administration experience.

• Strong expertise in:

• Windows Server 2016/2019/2022

• Active Directory (AD)

• Group Policy (GPO)

• DNS and DHCP

• Windows Failover Clustering

• Hands-on experience with Terraform for Infrastructure as Code (IaC).

• Experience developing and managing Terraform modules, state files, and remote backends.

• Strong PowerShell scripting and automation experience.

• Experience with VMware and/or Hyper-V virtualization platforms.

• Strong troubleshooting skills across server, OS, networking, and storage layers.

• Experience with patch management, vulnerability remediation, and security hardening.

• Knowledge of Azure and AWS infrastructure services.

• Experience with enterprise backup and disaster recovery solutions.

• Hands-on experience with ServiceNow or similar ITSM platforms.

• Strong understanding of networking concepts including TCP/IP, DNS, routing, load balancing, and firewall fundamentals.

• Experience supporting 24x7 mission-critical production environments.

Preferred Qualifications

• Microsoft Certified: Windows Server Hybrid Administrator Associate.
• HashiCorp Terraform Associate Certification.
• Azure Administrator (AZ-104) or Azure Solutions Architect certification.
• AWS SysOps Administrator certification.
• VMware VCP certification.
• Experience with Azure DevOps, GitHub Actions, Jenkins, or GitLab CI/CD.
• Experience with Ansible, PowerShell DSC, or other automation frameworks.
• Knowledge of container platforms such as AKS or Windows Containers.
• ITIL Foundation Certification.

Professional Attributes

• Strong ownership and accountability mindset.
• Excellent troubleshooting and analytical abilities.
• Ability to manage critical incidents under pressure.
• Strong verbal, written, and stakeholder communication skills.
• Ability to work effectively across infrastructure, application, and cloud teams.
• Strong documentation and process governance skills.
• Passion for automation, platform modernization, and continuous improvement.
• Team-oriented attitude with mentoring and knowledge-sharing capabilities.