Senior Linux System Administrator

Are you an experienced Senior Linux System Administrator looking for your next challenge? Your search ends here! We have an exciting opportunity for you to support several Programs in the Orlando Area. Your expertise will guide the definition, implementation, and delivery of capability focused on Cyber Training systems and Synthetic Environment Generation. You'll have the chance to work with a broad range of systems, providing overall support for various critical systems. Join our team and make a difference in the world of training systems and cybersecurity.

Are you ready to join a team dedicated to a mission? Begin your journey of a flourishing and meaningful career, share your resume with us today!

Primary Responsibilities:

• Support the design, implementation, operation, and maintenance of complex information systems, including physical facility infrastructure, virtual devices, containerized devices and physical devices in traditional and hyper-converged architectures.
• Responsible for high-level, day-to-day operational maintenance, support, and upgrades for complex operating systems, workstations and servers.
• Coordinates, directs and performs complex software installations and upgrades to operating systems and layered software packages. Schedules installations and upgrades and maintains them in accordance with established IT policies and procedures.
• Continually monitors and tunes multiple systems to achieve optimum performance levels.
• Ensures workstation/server data integrity by evaluating, implementing, and managing appropriate software and hardware solutions of varying complexities.
• Ensures data/media recoverability by developing and implementing a schedule of system backups and database archive operations.
• Plans and implements for the modernization of servers.
• Develops, implements and promotes standard operating procedures and schedules.
• Conducts hardware and software audits of workstations and servers to ensure compliance with established standards, policies, and configuration guidelines.
• Support the design, documentation, and implementation of enhancements to the system, ensuring that application software, cybersecurity, and operational use cases are fully accounted for.
• Ensure maximum system uptime and rapidly respond to hardware and software failures.
• Quickly diagnoses operational, performance, or other issues and leads the implementation of resolutions.
• Strong understanding of user account management processes and access control protocols.
• Experience with Active Directory, LDAP, or similar directory services.
• Familiarity with network security protocols and best practices.
• Knowledge of basic networking concepts (e.g., TCP/IP, DNS, DHCP).
• Strong troubleshooting and problem-solving skills.
• Familiarity with multi-factor authentication (MFA) and password management tools.
• Ability to work independently and as part of a team.

Basic Qualifications:

• Bachelor’s Degree with 8+ years of experience or a Master’s Degree with 6+ years of experience. Additional experience maybe considered in lieu of a degree.
• US Citizen with the ability to obtain and maintain at least a Secret security clearance.
• Active CompTIA Security+ CE certification
• Experience with Linux RHEL & Debian, Windows, AWS and Azure.
• Installing OS (from iso, pxe, and kickstart) onto bare metal and virtualized platforms
• Creating new customized kickstarts
• Troubleshooting issues via cli and utilizing logs
• Installing and removing custom software
• Experience managing and maintaining PC, server, laptop, and printer hardware.
• Experience maintaining and configuring local area networks (LAN) and wide area networks (WAN)
• Experience with Enterprise Virtualization (VMWare, Proxmox)
• Self-starter that is able to work independently while possessing the communication skills to work effectively with engineering teams, customers, and senior leadership.
• Experience with Identity and Access Management (IAM) solutions.
• Strong understanding of regulatory frameworks (e.g., HIPAA, GDPR, NIST) affecting account management practices.

Preferred Qualifications:

• Experience in Analysis of Alternatives (AoA) for new technologies.
• Experience with Windows 11, Windows Server 2019, 2022 and 2025, RHEL, Rocky, Ubuntu, Debian, Microsoft SQL Server, Microsoft Windows Server Update Servers (WSUS), Splunk, Security Technical implementation Guides (STIGs), PowerShell, and Group Policies.
• Experience with DNS/DHCP, IPAM (BlueCat), load balancers (F5), Authentication Systems (Clearpass).
• Familiar with managing Cisco Layer 2 and 3 networking devices, including Cisco ISR routers, Cisco Catalyst 9k switches, and Dell OS10 switches.
• Familiar with managing and configuring Dell iDRAC, VMWare ESXI, and VMWare VCenter.
• Familiar with configuring system utilizing Python and Ansible.
• Familiar with implementing DOD STIGs.
• Experience with enterprise network management tools such as HPNA, SolarWinds, Cisco Smartnet, LiveAction, Splunk, or similar technologies with WAN/SDWAN/SDN system analysis and design documents.
• Knowledge of ITIL Change & Configuration Management.
• Relevant certifications (e.g., CompTIA Network+, CompTIA Security+, CompTIA Linux+, (RHCE) Red Hat Certified Engineer, (RHCSA) Red Hat Certified System Administrator).

For U.S. Positions: While subject to change based on business needs, Leidos reasonably anticipates that this job requisition will remain open for at least 3 days with an anticipated close date of no earlier than 3 days after the original posting date as listed above.

The Leidos pay range for this job level is a general guideline only and not a guarantee of compensation or salary. Additional factors considered in extending an offer include (but are not limited to) responsibilities of the job, education, experience, knowledge, skills, and abilities, as well as internal equity, alignment with market data, applicable bargaining agreement (if any), or other law.