As an L3 Server Administrator, you will be responsible for the design, deployment, administration, optimization, and troubleshooting of enterprise server environments (Windows and/or Linux). This senior-level role involves handling escalations, advanced problem-solving, automation, and collaboration with virtualization, storage, and networking teams to ensure high availability, performance, and security of server infrastructure.

Key Responsibilities:

Provide L3 operational support for Windows and/or Linux server environments.
Install, configure, and maintain Windows Server (2016/2019/2022) and Linux distributions (RHEL, CentOS, Ubuntu, SUSE).
Manage Active Directory, DNS, DHCP, Group Policy, WSUS, and Certificate Services for Windows servers.
Perform patching, OS upgrades, and vulnerability remediation.
Troubleshoot escalated incidents including OS, hardware, cluster, and integration issues.
Manage high availability and clustering solutions (Failover Clusters, Always-On, Pacemaker, Corosync).
Administer file/print services, IIS/Apache, NFS/SMB, and other server roles.
Integrate and support VMware, Hyper-V, and cloud-based servers (Azure, AWS, GCP).
Implement and monitor backup/recovery and disaster recovery strategies.
Automate server operations using PowerShell, Bash, or Python scripting.
Perform capacity planning, performance tuning, and security hardening.
Maintain runbooks, SOPs, and documentation in line with ITIL practices.
Participate in on-call support rotation and provide RCA for major incidents.

Required Skills & Experience:

Extensive experience in Windows/Linux server administration (6-10+ years).
Strong expertise in Active Directory, DNS, DHCP, Group Policy, clustering, and patch management (Windows).
Strong knowledge of Linux system services, package management, LVM, SELinux/AppArmor.
Familiarity with VMware/Hyper-V virtualization and integration with storage/SAN.
Experience with monitoring tools (SCOM, Nagios, Zabbix, SolarWinds).
Strong troubleshooting and root cause analysis skills.
Knowledge of IT security standards including hardening, patch compliance, and auditing.
Scripting/automation experience using PowerShell, Bash, Python, or Ansible.
Willingness to work in rotational shifts (shift cab allowances provided).

Preferred Qualifications:

Microsoft Certified: Windows Server Hybrid Administrator Associate / MCSE.
Red Hat Certified Engineer (RHCE) or equivalent Linux certifications.
Experience with cloud-based server administration (Azure, AWS, GCP).
Familiarity with DevOps tools such as Ansible, Puppet, Chef, Terraform.

Soft Skills:

Strong analytical and problem-solving skills.
Ability to handle critical escalations under pressure.
Collaborative mindset and mentoring capability.
Professional documentation and reporting skills.

Server Administrator L2/L3