Linux and Windows Systems Administrator

Leidos is seeking a Linux and Windows Systems Administrator to support mission-critical IT operations for government and commercial clients. In this role, you will install, configure, and maintain mixed Linux/Windows server environments, ensuring availability, performance, and security. Responsibilities include patching, hardening, user and access management, backup and recovery, and troubleshooting complex system issues. You will collaborate closely with security, network, and engineering teams, leverage automation where possible, and contribute to documentation and continuous improvement in a fast-paced, mission-driven environment.

Responsibilities

• Administer, configure, and maintain Linux and Windows servers in production and test environments
• Monitor system performance, capacity, and availability, implementing tuning and optimization
• Apply OS patches, updates, and security hardening in accordance with compliance standards
• Manage user accounts, permissions, and group policies across mixed environments
• Troubleshoot and resolve system, network, and application issues to minimize downtime
• Automate routine administration tasks using scripting and configuration management tools
• Implement and maintain backup, recovery, and disaster recovery procedures
• Collaborate with security, network, and application teams to support mission-critical projects
• Create and maintain system documentation, runbooks, and standard operating procedures
• Support on-call rotation and incident response for high-priority operational events

Required Skills

• Linux system administration (RHEL, Cent
• OS, Ubuntu)
• Windows Server administration (AD, DNS, DHCP, GPO)
• Virtualization platforms (VMware, Hyper-V)
• Shell scripting (Bash, Power
• Shell)
• Configuration management tools (Ansible, Puppet, or Chef)
• System monitoring and logging tools (Nagios, Splunk, or similar)
• Backup and recovery solutions for servers and data
• Identity and access management in mixed environments
• Security hardening and patch management for Linux and Windows
• TCP/IP networking fundamentals and troubleshooting