Sr. System Administrator / TS/SCI / Onsite: CO - Littleton CO

This position is available to Veterans, Transitioning Military, National Guard and Reserve Members, Military Spouses, Wounded Warriors, and their Caregivers. On-site in Denver, CO; relocation assistance is not provided. Active TS/SCI clearance with polygraph required to start.

About the role

This Enterprise Operations (EO) position supports the Lockheed Martin Space division. The selected candidate will provide IT support for critical programs, ensuring Lockheed Martin IT systems are managed, controlled, and compliant with the Corporate Information Protection Manuals (CIPM). Responsibilities include upgrades, operations and maintenance, hardware and software installations, service requests (servers, workstations, containers, networking, and storage), and continuity of operations (backups and verified restore capabilities).

The role involves system administration and architecture for classified environments, technical planning, system integration, verification and validation, and analyses at all levels of system product lifecycle—from concept to disposal. The candidate will translate customer requirements into hardware and software specifications through functional analysis, timeline analysis, trade studies, and interface definition.

Responsibilities

• Administer Linux and Windows server environments in classified settings.
• Perform system integration, verification, validation, and risk analysis.
• Design, develop, and analyze computer systems or programs based on user or system design specifications.
• Apply systems analysis techniques to determine hardware, software, or system functional specifications.
• Conduct analyses across the total system lifecycle: concept, design, fabrication, test, installation, operation, maintenance, and disposal.
• Ensure logical and systematic conversion of customer requirements into total systems solutions, considering technical, schedule, and cost constraints.
• Perform functional analysis, timeline analysis, trade studies, and requirements allocation to translate customer needs into specifications.
• Manage OS lifecycle and configuration (installation/upgrades, system imaging, account management, print services, domain integration, hardware modernization, performance monitoring).
• Implement DISA STIGs and security hardening for OS and applications.
• Diagnose and troubleshoot network issues.
• Perform vulnerability remediation and security management (system hardening, log management, configuration management using tools like Nessus, Trellix, Splunk, ACAS, SCAP).
• Accommodate occasional off-shift hours.

Requirements

• Active TS/SCI clearance with ability to obtain CI Poly.
• U.S. Citizenship (required for facility access).
• DoD 8572-qualified certification (e.g., CompTIA Security+).
• 3+ years of experience administering Linux and Windows server environments.
• Experience with DISA STIGs and security hardening.
• Experience with OS lifecycle management and configuration management.
• Experience with vulnerability remediation and security tools (Nessus, Trellix, Splunk, ACAS, SCAP).
• Strong communication skills and ability to work in a team.

Desired Qualifications

• Active TS/SCI clearance with CI Poly.
• 5+ years of experience administering Linux and Windows server environments.
• Familiarity with automation tools (e.g., Ansible, PowerShell).
• Experience administering NetApp storage devices.
• Advanced IT certification (e.g., RHCSA, MSCE, CISSP).

Pay

Full-time salary range: $95,900 – $178,100.

Benefits

• Medical, dental, and vision insurance.
• Flexible work arrangements (e.g., 4x10 schedule).
• 401(k) match.
• Paid time off and holidays.
• Parental leave.
• Employee Assistance Program (EAP).
• Flexible Spending Accounts.
• Education assistance.
• Life insurance.
• Short-term and long-term disability.