Job Description

System Administrator - Linux
Leidos has a new and exciting opportunity for a System Administrator - Linux in our National Security Sector's (NSS) Cyber & Analytics Business Area (CABA). Our talented team is at the forefront in Security Engineering, Computer Network Operations (CNO), Mission Software, Analytical Methods and Modeling, Signals Intelligence (SIGINT), and Cryptographic Key Management. At Leidos, we offer competitive benefits, including Paid Time Off, 11 paid Holidays, 401K with a 6% company match and immediate vesting, Flexible Schedules, Discounted Stock Purchase Plans, Technical Upskilling, Education and Training Support, Parental Paid Leave, and much more. Join us and make a difference in National Security!
Primary Responsibilities
The selected individual will be responsible for monitoring infrastructure systems, applications, and processes, and for ensuring that all issues are identified, tracked, and resolved in a timely manner. She/he will provide support for all infrastructure systems and will respond to hardware and software incidents and work with senior system administrators, at times remotely from other locations. Other responsibilities include:

• Quickly responding to IT Help Desk calls and emails in a professional manner; ensuring issues are resolved and/or escalated to the appropriate teams; and following up with teams and users to ensure issues are satisfactorily remediated.
• Identifying, troubleshooting, and correcting hardware and software issues including network connectivity.
• Utilizing enterprise monitoring solutions to identify alarms that have been triggered against the various environments.
• Proactively contacting customers when infrastructure processes are significantly delayed or may impact their ability to complete a business function on time.
• Executing the process for managing information assurance vulnerability alerts (IAVAs) and system security scanning for equipment suites in accordance with the System Security Plans for these systems to rapidly and accurately identify and remediate IAVAs.
• Initiating IAVA responses and system security scans, completing remediation, and extending IAVA patches and security updates on various IT and network systems.
• Providing technical assistance to companion work groups in support of overlapping projects such as implementing IT enhancements and optimizing systems.
• Maintaining good inter-departmental relations, communicating with users, and publishing status of system outages.
• Participating in the creation and ongoing maintenance of documentation to ensure clear, concise and accurate information is readily available to assist with incident resolution.

Required Qualifications

• BS degree in a technical field and at least 8 years of relevant experience. Additional experience may be substituted for a degree.
• Must have at least 5 years of direct, hands-on experience providing assistance to users in an IT customer service capacity.
• Must have at least 5 years of experience working on an IT/software program that utilizes complex equipment/systems (ex. Network Switches, Routers, LANs, & cabling, Windows/Linux operating systems, VMware, etc.).
• Must have experience installing, updating, and upgrading Linux Operating Systems (OS).
• Must have experience with utilities used to manage Linux OS disk file systems.
• Must have experience analyzing and implementing Security Technical Implementation Guide (STIG) requirements in Linux OS.
• Must have experience with utilities used to create and configure network connections in Linux OS.
• Must have experience implementing Windows Active Directory User Authentication in Linux OS.
• Must be proficient in reading and modifying User/Group permissions in Linux OS.
• Must be proficient in reading, analyzing, and troubleshooting errors within Linux OS.
• Must have experience with IT system optimization, monitoring, and technical set-up and troubleshooting.
• Must have experience with Data Center design and configuration (e.g. rack and stack, power, placement, etc.).
• Must have experience gathering data for and documenting technical processes.
• Must have experience documenting IT issues and providing detailed and comprehensive status reports and follow-ups.
• Must have experience Analyzing and addressing IAVAs/CVEs (response and remediation, system security scans, extending IAVA patches and security updates on IT and network systems, etc).
• Must be committed to adopting and adhering to best practices including compliance with maintenance windows and change control procedures.
• Must possess strong analytic abilities and must be meticulous and careful in their work.
• Must be an independent thinker capable of working independently as well as within a team.
• Must be able to respond to emergency system administration, operations, and maintenance problems, on a limited as-needed on-call basis.
• Must be able to travel up to 25% of the time to local program locations (not overnight). Additional travel to CONUS and OCONUS location(s) may also be required (overnight).

Preferred Qualifications

• Experience with security standards, software architectures, and Network security technologies (Multiple Domain, PKI, SSP, Vulnerability Assessment, etc.).
• Experience working with Enterprise Domain Services.
• Experience building and deploying Virtual Machines within an On-Premises Data Center.
• Experience with scripting and/or automation tools.
• Experience reading, analyzing, and addressing security vulnerabilities discovered from automated scanning tools.
• Experience supporting a large, complex software configuration management and development program.
• Experience working in an Agile Development Environment or on an Agile Team.

At Leidos, the opportunities are boundless. We challenge our staff with interesting assignments that allow them to thrive professionally and personally. For us, helping you grow your career is good business. We look forward to learning more about you - apply today.
careers.leidos.com/CONMD
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CONMD
If you're looking for comfort, keep scrolling. At Leidos, we outthink, outbuild, and outpace the status quo -- because the mission demands it. We're not hiring followers. We're recruiting the ones who disrupt, provoke, and refuse to fail. Step 10 is ancient history. We're already at step 30 -- and moving faster than anyone else dares.
Original Posting: November 18, 2025
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.
Pay Range: Pay Range $89,700.00 - $162,150.00
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.

Skills Required