The SME Core Infrastructure (L3) is a senior, hands-on technical role responsible for the stability, performance, and resiliency of ATSs core infrastructure platforms, including Active Directory / Entra (operational), Windows Server, VMware, VDI, and Backup/Disaster Recovery.

This role serves as the final escalation point (L3) for core infrastructure incidents and plays a critical role in stabilizing operations, reducing recurring issues, and supporting the organizations transition from a reactive to a proactive operating model.

This position is an individual contributor role and does not include people management responsibilities.

Education and Certification :

Education :

- Bachelors degree in Computer Science, Information Technology, or a related field, or equivalent practical experience

Certifications (Preferred) :

- Microsoft certifications related to Windows Server, Active Directory / Entra ID, or Azure (e.g., Windows Server Hybrid Administrator, Identity & Access Administrator, Azure Administrator)

- VMware Certified Professional (VCP-DCV) or equivalent enterprise virtualization experience

- Veeam Certified Engineer (VMCE) or equivalent backup and disaster recovery experience

- ITIL Foundation or experience working within ITIL/ITSM environments

Experience & Skills :

- 8 to 12+ years of experience in enterprise IT infrastructure roles

- Expert-level experience with Active Directory administration and troubleshooting

- Strong hands-on experience with VMware virtualization platforms

- Experience supporting VDI environments

- Windows Server administration experience (20162022)

- Strong knowledge of DNS, DHCP, and Group Policy

- Experience with backup and disaster recovery tools (Veeam preferred)

- Experience operating within ITIL/ITSM-based support environments

Skills :

- Hybrid identity exposure (Azure AD Connect / Entra sync operational level)

- PowerShell scripting for automation and diagnostics

- Experience supporting global, multi-region environments

- Prior experience supporting infrastructure components during M&A integrations

- Manage and support Office 365 / M365 services including Exchange Online, Teams, OneDrive, SharePoint, security configurations, and license management.

Responsibilities :

Core Infrastructure Operations :

- Act as L3 escalation owner for Active Directory, Windows Server, VMware, and VDI-related incidents

- Administer, maintain, and optimize Active Directory / Entra (operational) services including DNS, DHCP, Group Policy, trusts, and authentication services

- Lead troubleshooting and performance optimization of VMware (vSphere / ESXi / vCenter) and virtual desktop platforms

- Manage and maintain Windows Server environments, ensuring platform stability and readiness for patching and upgrades

- Administer and support backup and disaster recovery platforms (e.g., Veeam), including restore testing and DR preparedness

Stabilization, Reliability & Continuous Improvement :

- Perform Root Cause Analysis (RCA) for complex or recurring infrastructure issues and implement permanent corrective actions

- Lead infrastructure stabilization initiatives to reduce technical debt and recurring incidents

- Develop and maintain technical documentation, SOPs, and operational runbooks

- Partner with the Infrastructure Team Lead to reduce ticket backlog, improve MTTR, and increase service reliability

- Identify opportunities for automation and operational efficiency (PowerShell or equivalent scripting)

Collaboration & Support :

Collaborate closely with :

- Security & Endpoint Engineering on patching, hardening, and vulnerability remediation

- Cloud & M365 teams for hybrid identity and infrastructure dependencies

- Enterprise Architecture for alignment with standards and modernization initiatives

- Provide technical guidance and mentoring to L1/L2 engineers

- Support infrastructure-related activities for M&A integrations, upgrades, and modernization projects

- Own Microsoft 365 licensing management and governance, including:

- License assignment, tracking, and optimization across the tenant

- Management of M365 SKUs (E3, E5, F-series, add-ons, Defender, Purview, etc.)

- Identification and remediation of unused, underutilized, or misassigned licenses

- Group-based and role-based license assignment models

- Must possess strong expertise in Microsoft 365 compliance technologies including Litigation Hold, eDiscovery, Purview retention, and posttenant-migration data governance.