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System Administrator
Job Location:
Monthly Salary:
Posted:
29 September 2026 (Yesterday)
Posted:
Application Deadline:
27 December 2026
Application Deadline:
Vacancies:
1 Vacancy
Vacancies:
Job Summary
Marathon TS is seeking an experienced Systems Administrator to join a dynamic team.
Description:
We are seeking a highly experienced and hands-on candidate to support research development and defense systems software hardware and network integration laboratory. This role is critical to enabling engineers and developers to design build integrate and research complex mission systems in both standalone on-premises and cloud-based environments. The ideal candidate brings deep technical expertise across Linux-based systems administration and infrastructure combined with strong organizational and operational discipline required for classified environments. This position requires a proactive problem solver who thrives in dynamic lab settings and can manage multiple systems configurations and priorities simultaneously. Additional responsibilities include: (1) Plan design deploy configure and maintain secure lab environments supporting software hardware and network integration efforts; (2) Install configure and troubleshoot servers workstations and storage systems; (3) Support integration of complex systems including embedded hardware simulation environments and test
platforms; (4) Create and manage system baselines containers virtualized environments directory objects configurations and documentation in accordance with DoD RMF ATO and CMMC security and compliance requirements; (5) Provide hands-on support for system builds upgrades patching and troubleshooting in lab and test environments; (6) Develop and maintain automation scripts and tools to streamline system provisioning and maintenance; (7) Monitor system performance reliability and security posture; proactively resolve issues; (8) Maintain
inventory and lifecycle management of lab assets and infrastructure; and (9) Support incident response audit readiness and compliance
inspections.
Requirements:
Required Clearance: Ability to obtain a Secret DoD Security Clearance.
Preferred Clearance: Active DoD Security Clearance (Secret/Top Secret with eligibility for SCI as required).
Citizenship: Candidate must be a United States citizen.
Education:
BS in Information Technology Computer Science Engineering or related technical field.
Experience:
3-5 years of experience in systems administration in complex mission-critical environments.
3 years of DoD/Federal work experience.
Required Skills:
Demonstrated experience working in CUI and classified environments with strong understanding of security protocols and operational
constraints.
Strong hands-on experience with: Linux-based system administration in a virtualized environment (e.g. VMware ProxMox).
Software maintenance using package management software and compilation from source when required.
Storage systems and backup solutions.
Excellent troubleshooting and problem-solving abilities.
Hunger to learn and develop cross-functional skills.
Linux certifications (e.g. LFCS or Linux ).
DCWF Work Role 451 compliant.
Desired Skills:
Strong organizational skills with the ability to manage multiple systems configurations and priorities.
Integration with hardware and software systems covering various operating systems and interfaces.
Networking fundamentals (routing switching firewalls VLANs).
Proficiency with scripting and automation (e.g. PowerShell Bash Python).
Experience implementing and maintaining security controls (STIGs SCAP patching hardening CMMC requirements).
Experience with FPGA-based or embedded systems integration in lab environments.
Experience supporting defense or aerospace integration labs or test environments.
Familiarity with DevSecOps practices and CI/CD pipeline infrastructure.
Experience with containerization technologies (e.g. Docker Kubernetes).
Knowledge of configuration management tools (e.g. Ansible Puppet Chef).
Experience with cross-domain solutions and multi-level security (MLS) environments.
#CJJOBS
Marathon TS is committed to the development of a creative diverse and inclusive work order to provide equal employment and advancement opportunities to all individuals employment decisions at Marathon TS will be based on merit qualifications and abilities. Marathon TS does not discriminate against any person because of race color creed religion sex national origin disability age or any other characteristic protected by law (referred to as protected status).
Description:
We are seeking a highly experienced and hands-on candidate to support research development and defense systems software hardware and network integration laboratory. This role is critical to enabling engineers and developers to design build integrate and research complex mission systems in both standalone on-premises and cloud-based environments. The ideal candidate brings deep technical expertise across Linux-based systems administration and infrastructure combined with strong organizational and operational discipline required for classified environments. This position requires a proactive problem solver who thrives in dynamic lab settings and can manage multiple systems configurations and priorities simultaneously. Additional responsibilities include: (1) Plan design deploy configure and maintain secure lab environments supporting software hardware and network integration efforts; (2) Install configure and troubleshoot servers workstations and storage systems; (3) Support integration of complex systems including embedded hardware simulation environments and test
platforms; (4) Create and manage system baselines containers virtualized environments directory objects configurations and documentation in accordance with DoD RMF ATO and CMMC security and compliance requirements; (5) Provide hands-on support for system builds upgrades patching and troubleshooting in lab and test environments; (6) Develop and maintain automation scripts and tools to streamline system provisioning and maintenance; (7) Monitor system performance reliability and security posture; proactively resolve issues; (8) Maintain
inventory and lifecycle management of lab assets and infrastructure; and (9) Support incident response audit readiness and compliance
inspections.
Requirements:
Required Clearance: Ability to obtain a Secret DoD Security Clearance.
Preferred Clearance: Active DoD Security Clearance (Secret/Top Secret with eligibility for SCI as required).
Citizenship: Candidate must be a United States citizen.
Education:
BS in Information Technology Computer Science Engineering or related technical field.
Experience:
3-5 years of experience in systems administration in complex mission-critical environments.
3 years of DoD/Federal work experience.
Required Skills:
Demonstrated experience working in CUI and classified environments with strong understanding of security protocols and operational
constraints.
Strong hands-on experience with: Linux-based system administration in a virtualized environment (e.g. VMware ProxMox).
Software maintenance using package management software and compilation from source when required.
Storage systems and backup solutions.
Excellent troubleshooting and problem-solving abilities.
Hunger to learn and develop cross-functional skills.
Linux certifications (e.g. LFCS or Linux ).
DCWF Work Role 451 compliant.
Desired Skills:
Strong organizational skills with the ability to manage multiple systems configurations and priorities.
Integration with hardware and software systems covering various operating systems and interfaces.
Networking fundamentals (routing switching firewalls VLANs).
Proficiency with scripting and automation (e.g. PowerShell Bash Python).
Experience implementing and maintaining security controls (STIGs SCAP patching hardening CMMC requirements).
Experience with FPGA-based or embedded systems integration in lab environments.
Experience supporting defense or aerospace integration labs or test environments.
Familiarity with DevSecOps practices and CI/CD pipeline infrastructure.
Experience with containerization technologies (e.g. Docker Kubernetes).
Knowledge of configuration management tools (e.g. Ansible Puppet Chef).
Experience with cross-domain solutions and multi-level security (MLS) environments.
#CJJOBS
Marathon TS is committed to the development of a creative diverse and inclusive work order to provide equal employment and advancement opportunities to all individuals employment decisions at Marathon TS will be based on merit qualifications and abilities. Marathon TS does not discriminate against any person because of race color creed religion sex national origin disability age or any other characteristic protected by law (referred to as protected status).
Required Experience:
Unclear Seniority
