Mid/Sr. System Administrator TS/SCI Poly

Leidos LLC; Maryland; On-site; USD 92,000 - 167,000; Full time

Benefits offered by this job

Paid Time Off

11 paid Holidays

401K with 6% company match

Flexible Schedules

Discounted Stock Purchase Plans

Technical Upskilling

Education and Training Support

Parental Paid Leave

Job summary

Leidos is seeking a Mid/Sr System Administrator to support a large, complex network environment with geographically distributed systems and air-gapped domains. You will install apps, manage servers, and ensure continuous, secure operation while handling patching, cert renewals, and AD configurations.

You will work with security-focused teams to optimize performance, document architectures, and resolve incidents quickly in a fast-paced setting. Clearances and travel may be required.

Qualifications

• Bachelor's degree and 8+ years of relevant experience, or equivalent.
• Experience as a systems administrator providing direct end-user and staff support.
• Proficiency with Windows Server 2019 and Active Directory.
• Experience with deployment, patches, OS, backup/restore, and virtualization.
• Familiarity with SALT, Ansible, Splunk, Puppet, SolarWinds, Nessus, RedHat and VMWare.
• Strong information security understanding and ability to support TS/SCI with Polygraph.

Responsibilities

• Install applications, administer systems, and resolve issues promptly.
• Ensure server/desktop configurations run continuously and efficiently.
• Perform security management and application performance optimization.
• Sustain a web-based information storage/sharing system.
• Create/maintain complex server enclaves; analyze scans, patch, renew certs, manage vulnerabilities, configure AD.
• Identify and fix hardware/software issues.
• Respond to admin/ops/maintenance problems and develop rework solutions.
• Document complex server/network environments for incident resolution.
• Communicate outages/upgrades with users and management.

Skills

Windows Server 2019

Active Directory

SALT

Ansible

Splunk

Puppet

SolarWinds

Nessus

RedHat

VMWare

Security best practices

Client/Server virtualization

Education

Bachelor's Degree in System Engineering, Computer Science, Information Systems, Engineering Science, Engineering Management

Tools

SQL Server

PowerShell

PowerCLI

Python scripting

Job description

Mid/Sr System Administrator Leidos has a new and exciting opportunity for a Mid/Sr System Administrator in our Intel Sector's 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!

Job Summary

The selected individual will provide system administration support for a large, complex network environment with geographically distributed systems. The role supports system engineering requests by delivering solutions that meet operational needs, and by upgrading, sustaining, and maintaining existing capabilities. The candidate must be comfortable working in a fast-paced environment that includes multiple air-gapped systems, each with its own domain and supporting infrastructure. The position also requires maintaining a complex IT environment involving multiple users, as well as associated storage and network infrastructure. This role requires an energetic, focused, and driven individual who can adapt quickly to changing priorities. The candidate must demonstrate strong system administration and troubleshooting skills and work effectively with the team to execute a variety of network-centric system administration tasks.

Responsibilities Include

• The selected individual will be responsible for installing applications, administrating systems and processes, and ensuring issues are identified and resolved in a timely manner.
• She/he will be responsible for ensuring server and desktop configurations are optimized and running continuously and efficiently.
• The selected individual will also perform security management and application performance optimization functions.
• Administration/sustainment of a system that provides a web-based application for storing, sharing, and distributing information.
• Creating and maintaining complex server enclaves, including analyzing system scanning reports, patching, cert renewals, vulnerability management assessments, and active directory configurations.
• Identifying and correcting hardware and software issues.
• Responding to system administration, operations, and maintenance problems, and developing re-work solutions.
• Creating and maintaining documentation of complex server/network environments to ensure that clear, concise and accurate information is readily available for incident resolution.
• Communicating with users and external support personnel regarding system outages and upgrades, and conferring with upper management regarding recommended resolution options.

Basic Qualifications

• Bachelor's Degree in System Engineering, Computer Science, Information Systems, Engineering Science, Engineering Management, or a related technical field and at least 8 years of relevant experience.
• Additional experience may be substituted for a degree.
• Must have experience as a systems administrator providing direct support to end users and technical staff (developers, testers, engineers, etc.).
• Must be proficient with Windows Server 2019 and Active Directory.
• Must have experience with software/hardware deployment, patches, operating systems, and basic system backup and restore functions.
• Must have experience with/be familiar with SALT, Ansible, Splunk, Puppet, SolarWinds, Nessus.
• Must have experience with and/or have knowledge of RedHat and VMWare.
• Must have a solid understanding of advanced security protocols and standards.
• Must have experience with both Client and Server virtualization environments.
• Must have experience with installation, configuration, troubleshooting, and reimaging hardware.
• Must have a solid understanding of information security principles and practices.
• Must be able to lift up to 50 lbs.
• Must be able to support occasional day or short duration travel.
• Clearance Required: Must have TS/SCI with Polygraph.

Preferred Qualifications

• Proficiency with SQL Server.
• SALT and Python scripting experience.
• Experience supporting a software configuration management and development environment.
• Experience working in an Agile Development Environment or on an Agile Team.
• Knowledge of PKI systems which use HSMs to validate key and NTP for synchronization.
• Knowledge of PowerShell and PowerCLI.
• Experience in documenting and providing information for security accreditation and certification.

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. 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. If you’re looking for comfort, keep scrolling. At Leidos, we outthink, outbuild, and outpace the status quo — because the mission demands it.

Original Posting: August 25, 2026 For U.S. Positions: While subject to change based on business insights, 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 $92,300.00 - $166,850.00 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.

Leidos Leidos is an industry and technology leader serving government and commercial customers with smarter, more efficient digital and mission innovations. Headquartered in Reston, Virginia, with 47,000 global employees, Leidos reported annual revenues of approximately $17.2 billion for the fiscal year ended January 2, 2026. For more information, visit www.Leidos.com.

Pay and Benefits Pay and benefits are fundamental to any career decision. That's why we craft compensation packages that reflect the importance of the work we do for our customers. Employment benefits include competitive compensation, Health and Wellness programs, Income Protection, Paid Leave and Retirement. More details are available here.

Securing Your Data Leidos will never ask you to provide payment-related information at any part of the employment application process. And Leidos will communicate with you only through emails that are sent from a Leidos.com email address. If you receive an email purporting to be from Leidos that asks for payment-related information or any other personal information, please report the email to [e-mail].

Commitment and Diversity

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.