Systems Administrator

Leidos is seeking a Systems Administrator to support mission-critical IT environments for national security, health, and engineering clients. In this role, you will install, configure, and maintain servers, storage, and core services while ensuring availability, performance, and security. You will manage patching, backups, and incident resolution, collaborating closely with cyber, engineering, and project teams. Leidos offers competitive pay, comprehensive benefits, flexible work options, and ongoing training in a mission-driven, collaborative culture focused on integrity and innovation.

Responsibilities

• Install, configure, and maintain Windows and Linux servers and core infrastructure services
• Monitor system performance, availability, and capacity; implement tuning and optimization
• Manage user accounts, permissions, and access controls across environments
• Apply patches, updates, and firmware to maintain secure, compliant systems
• Implement and maintain backup, recovery, and disaster recovery procedures
• Troubleshoot and resolve hardware, OS, and network-related incidents and problems
• Harden systems and enforce security baselines in coordination with cybersecurity teams
• Create and maintain system documentation, runbooks, and configuration records
• Support on-call rotation for mission-critical systems and after-hours maintenance
• Collaborate with cross-functional teams to support deployments and modernization projects

Required Skills

• Windows Server administration
• Linux server administration
• Virtualization (VMware/Hyper-V)
• Active Directory and Group Policy
• TCP/IP networking and DNS/DHCPSystem monitoring and performance tuning
• Backup and disaster recovery tools
• Scripting (Power
• Shell/Bash)
• Security hardening and patch management
• Cloud platforms (AWS/Azure)