Senior Systems Administrator

Description The Leidos Intel Sector combines technology-enabled services and mission software capabilities in the areas of cyber, logistics, security operations, and decision analytics to support our defense and intel customers’ mission to defend against evolving threats around the world. Our team’s focus is to ensure our customers have the right tools, technologies, and tactics to keep pace with an ever-evolving security landscape and succeed in their pursuit to protect people and critical assets. Locations Gaithersburg, MD Alexandria, VA Englewood, CO St. Louis, MO Tucson, AZ Clearance Level Required Top Secret with the ability to obtain SCI, as well as a Polygraph. Primary Responsibilities Lead system administration for Linux and Windows-based systems in secure, mission-critical environments. Diagnose and resolve hardware, software, and end‑user technical issues while serving as a primary IT support contact, managing support tickets through resolution, and delivering responsive customer service. Architect and manage complex server, storage, and virtualization infrastructure (VMware, KVM). Perform OS installation, configuration, hardening, and patching in compliance with DoD STIGs and agency policies. Monitor and tune system performance, conduct root‑cause analysis, and resolve complex issues quickly and efficiently. Support backup/recovery strategies, disaster recovery plans, and continuity of operations. Oversee and maintain automation scripts and infrastructure as code (Ansible, PowerShell, Bash, etc.). Maintain system documentation, configuration baselines, and support CM and RM activities. Lead and support deployment of system enhancements and modernization initiatives for Chinook program. Collaborate with cybersecurity, network engineering, and software development teams to ensure system compliance and performance. Participate in security audits, incident response, and operational readiness activities. Basic Qualifications US citizenship is required per contract. Bachelor’s degree in Computer Science, Engineering, Information Technology, or related discipline and 8-12 years of prior relevant experience, or Master’s with 6-10 years of prior relevant experience. DoD 8570 IAT Level II or III certification (e.g., Security+ CE, CASP+, CISSP). Experience with cloud platforms (AWS GovCloud, Azure Government) and hybrid cloud environments. Experience with Linux (Red Hat Enterprise Linux or CentOS) and Windows Server platform system administration. Proficiency with virtualization platforms (VMware, KVM) and management tools. Experience with automation and scripting (Ansible, Bash, PowerShell, Python). Familiarity with STIG compliance, system hardening, ACAS scans, and RMF processes. Strong understanding of enterprise networking, identity/access management, and storage concepts. Proven ability to troubleshoot, document, and lead systems‑related projects independently. Experience supporting IC or DoD classified environments. Preferred Qualifications Experience supporting our customer or GEOINT missions. Familiarity with DevOps tools and pipelines (Git, Jenkins, Docker, etc.). Knowledge of enterprise backup solutions, DNS, DHCP, Active Directory, and PKI. Pay Range $92,300.00 - $166,850.00 Commitment to Non-Discrimination All qualified applicants will receive consideration for employment without regard to sex, race, ethnicity, age, national origin, citizenship, religion, physical or mental disability, medical condition, genetic information, pregnancy, family structure, marital status, ancestry, domestic partner status, sexual orientation, gender identity or expression, veteran or military status, or any other basis prohibited by law. Leidos will also consider for employment qualified applicants with criminal histories consistent with relevant laws. #J-18808-Ljbffr COMFORT SYSTEMS