Senior Systems Administrator

Leidos seeks a Mid/Senior System Administrator to support mission-critical IT environments for government and commercial clients. In this role, you will administer and optimize Windows/Linux servers, Active Directory, virtualization, and cloud-enabled infrastructure. You'll ensure system availability, performance, and security through proactive monitoring, patching, backup, and incident response. Working in a mission-driven, collaborative culture, you will troubleshoot complex issues, automate administration tasks, and contribute to modernization projects while benefiting from robust training, flexible work options, and competitive pay and benefits.

Responsibilities

• Administer, monitor, and optimize Windows/Linux servers and core infrastructure services
• Manage user accounts, access controls, and identity services (e.g., AD)
• Implement and maintain system security hardening, patching, and compliance
• Perform backup, recovery, and disaster recovery testing
• Troubleshoot system and network issues, escalating as needed
• Automate routine administration tasks using scripting tools
• Support cloud and virtualization platforms and migrations
• Maintain documentation, diagrams, and runbooks for systems
• Collaborate with security, network, and application teams on projects
• Provide tier 2/3 support and participate in on-call rotations

Required Skills

• Windows server administration
• Linux server administration
• Active Directory and identity management
• Virtualization (VMware/Hyper-V)
• Cloud platforms (AWS/Azure)
• Scripting (Power
• Shell/Bash)
• System monitoring and performance tuning
• Backup and disaster recovery
• Security hardening and patch management
• Networking fundamentals (TCP/IP, DNS, DHCP)