Senior System Administrator
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Key skills for this role
About the Role
INFRA ASSURE seeks a Senior System Administrator / L3 Infrastructure Engineer to own the end-to-end availability, performance, security, and scalability of a hybrid Azure and on-premises infrastructure supporting a 24x7 e-commerce environment.
Key Skills for This Role
Responsibilities
- Own end to end operations of hybrid infrastructure (Azure and on premises)
- Independently manage the lifecycle of 100–200+ servers
- Administer Windows Server environments including Active Directory, DNS, DHCP, Group Policy, IIS, clustering
- Administer Linux/Unix servers including OS hardening, patching, service management, performance tuning
- Manage Microsoft Azure infrastructure including VMs, storage, networking, RBAC, Microsoft Entra ID, monitoring, backup, governance, cost optimization
- Plan and execute OS patching and vulnerability remediation
- Design, implement, and maintain backup and recovery strategies
- Administer enterprise backup solutions
- Manage enterprise storage platforms (SAN/NAS and cloud storage)
- Develop, maintain, and regularly test Disaster Recovery (DR) plans
- Monitor infrastructure health, capacity, and performance
- Plan and execute cloud to on premises and on premises to cloud migrations
Requirements
- Bachelor's degree in Computer Science, Information Technology, Engineering, or equivalent practical experience
- 8–10+ years of experience in Systems Administration or Infrastructure Engineering
- Proven experience managing hybrid Microsoft Azure and on premises infrastructure environments
- Experience independently administering 250+ Windows and Linux servers
- Strong expertise in Microsoft Azure IaaS
- Advanced Windows Server administration experience
- Strong Linux/Unix administration experience
- Hands on experience with VMware and/or Hyper V virtualization platforms
- Experience managing SAN/NAS storage
- Experience administering enterprise backup solutions such as Veeam, Azure Backup, or equivalent
- Strong scripting and automation skills using PowerShell and Azure CLI
- Microsoft Certified: Azure Administrator Associate (AZ 104) or equivalent
Full Job Posting
About the Role
- We are seeking a highly experienced Senior System Administrator / L3 Infrastructure Engineer to own the end to end availability, performance, security, and scalability of our hybrid infrastructure supporting a 24x7 e commerce environment.
- As the senior most infrastructure engineer, you will independently manage Azure and on premises environments, ensuring platform reliability across compute, storage, virtualization, backup, disaster recovery, and core Windows/Linux services.
- This role serves as the primary L3 escalation point, leading infrastructure upgrades, migrations, automation initiatives, and operational excellence while mentoring junior engineers.
Key Responsibilities
- Own end to end operations of hybrid infrastructure (Azure and on premises), including compute, storage, virtualization, networking, and platform reliability.
- Independently manage the lifecycle of 100–200+ servers, including provisioning, hardening, configuration, patching, upgrades, and decommissioning.
- Administer Windows Server environments, including Active Directory, DNS, DHCP, Group Policy, File Services, IIS, clustering, and server performance management.
- Administer Linux/Unix servers, including OS hardening, patching, service management, user administration, performance tuning, and troubleshooting.
- Manage Microsoft Azure infrastructure, including virtual machines, storage, networking, RBAC, Microsoft Entra ID, monitoring, backup, governance, and cost optimization.
- Plan and execute operating system patching and vulnerability remediation while ensuring compliance with maintenance windows and change management processes.
- Design, implement, and maintain backup and recovery strategies, perform restore testing, and ensure compliance with RPO/RTO objectives.
- Administer enterprise backup solutions, including backup policy configuration, repository management, retention, restore validation, and backup health monitoring.
- Manage enterprise storage platforms (SAN/NAS and cloud storage), including capacity planning, replication, snapshots, performance tuning, and storage availability.
- Develop, maintain, and regularly test Disaster Recovery (DR) plans, failover/failback procedures, and operational runbooks.
- Monitor infrastructure health, capacity, and performance, proactively optimizing resource utilization and scalability.
- Plan and execute cloud to on premises and on premises to cloud migrations, including dependency analysis, cutover planning, rollback strategies, and post migration validation.
Required Experience
- Bachelor's degree in Computer Science, Information Technology, Engineering, or equivalent practical experience.
- 8–10+ years of experience in Systems Administration or Infrastructure Engineering.
- Proven experience managing hybrid Microsoft Azure and on premises infrastructure environments.
- Experience independently administering 250+ Windows and Linux servers.
- Strong expertise in Microsoft Azure IaaS, including compute, storage, networking, monitoring, backup, governance, and Microsoft Entra ID.
- Advanced Windows Server administration experience, including Active Directory, DNS, DHCP, Group Policy, IIS, clustering, and enterprise troubleshooting.
- Strong Linux/Unix administration experience across Red Hat, Ubuntu, CentOS, SUSE, or equivalent platforms.
- Hands on experience with VMware and/or Hyper V virtualization platforms.
- Experience managing SAN/NAS storage, replication, snapshots, storage performance, and capacity planning.
- Experience administering enterprise backup solutions such as Veeam, Azure Backup, or equivalent, including restore testing and disaster recovery.
- Strong understanding of patch management, vulnerability remediation, security hardening, and change management processes.
- Experience planning and executing cloud migrations, server relocations, and production infrastructure upgrades.
Preferred Certifications
- Microsoft Certified: Azure Administrator Associate (AZ 104) or equivalent (Required)
- Microsoft Certified: Azure Solutions Architect Expert (AZ 305) (Preferred)
- Microsoft Certified: Azure Security Engineer Associate (AZ 500) or Microsoft Security (SC series) certification (Preferred)
- VMware Certified Professional (VCP) (Preferred)
- Microsoft Hyper V Certification (Preferred)
- Veeam Backup & Replication Certification (VMCE) or equivalent Backup/Disaster Recovery certification (Preferred)
- ITIL Foundation Certification (Preferred)
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