IT Systems Administrator Senior - IT

We are seeking a Senior Systems Administrator responsible for the design, implementation, maintenance, and optimization of the organization’s server infrastructure. This role ensures high availability, reliable performance, and strong security across on-premises and cloud-based systems. The Senior System Administrator also provides technical leadership, mentors junior team members, and collaborates closely with cross-functional teams to deliver stable, scalable, and secure IT services.

Responsibilities

Architect, deploy, and maintain Windows and Linux server environments, including physical, virtual, and cloud-based platforms.
Manage Active Directory, DNS, DHCP, Group Policy, and identity-related services.
Administer virtualization platforms (VMware, Hyper-V, or equivalent), ensuring performance, capacity planning, and resource optimization.
Oversee patching strategies, OS upgrades, and lifecycle management for server systems.
Monitor server performance, logs, and alerts; troubleshoot and resolve complex systems issues.
Implement and enforce security best practices, including hardening, access controls, vulnerability remediation, and compliance with organizational standards.
Support backup, recovery, and disaster recovery planning, including routine testing and documentation.
Collaborate on infrastructure roadmaps and recommend improvements for performance, reliability, security, and scalability.
Maintain detailed system documentation, diagrams, and operation procedures.
Provide tier-3 support for escalated incidents and mentor junior administrators.
Participate in on-call rotation as required.

Qualifications

5-7 + years of experience administering enterprise-level server environments.
Strong proficiency with Windows Server and Linux environments.
Expertise with virtualization platforms such as VMware vSphere or Hyper-V.
Hands-on experience with Active Directory, DNS, DHCP, file systems, and Group Policy.
Solid understanding of networking fundamentals (TCP/IP, routing, firewalls).
Experience with backups and disaster recovery technologies.
Ability to manage complex technical projects with minimal supervision.
Excellent analytical, documentation, and communication skills.
Self-starter.
100% in office requirement.