MANTECH · 4 hours ago
Senior Systems Administrator
Chantilly, VA
Full-time
Onsite
Senior Level
5+ years expMANTECH is seeking a motivated and skilled Senior Systems Administrator to join their sustainment team in Chantilly, VA. In this role, you will support a mission-critical enterprise environment by ensuring the continued health, performance, and compliance of complex network and system infrastructures while driving key Operations and Maintenance activities.
Cyber SecurityInformation TechnologySecurityTelecommunications
No H1B
Security Clearance RequiredU.S. Citizen Only
Responsibilities
Provide hands-on O&M support for enterprise systems, including break-fix resolution and routine sustainment tasks
Monitor system performance, health, and availability using enterprise tools such as ServiceNow and JIRA
Collaborate with engineering and Assessment & Authorization (A&A) teams to apply patches, perform upgrades, and ensure RMF compliance
Support Identity and Access Management (IdAM) initiatives, including PKI, LDAP, and related authentication technologies
Maintain system documentation, configuration management, and security baselines in tools such as GitLab and Confluence
Conduct vulnerability scans, apply security patches, and ensure adherence to established cybersecurity standards
Contribute to DevOps and Agile processes by supporting deployments and collaborating closely with QA and development teams
Provide clear and timely communication on system status, planned maintenance, and incident response activities to stakeholders
Qualification
Required
Bachelor's degree or 4+ additional years of relevant experience in lieu of a degree
5+ years of experience in IT, O&M, sustainment, and/or break-fix support
Demonstrated experience performing system break-fix and troubleshooting activities
Experience supporting cloud and virtualized environments
Proficiency with PKI and IdAM COTS/custom solutions
Familiarity with Agile and DevOps methodologies
IAT Level II certification (GSEC, Security+, SSCP, or CCNA-Security)
Active TS/SCI with Polygraph is required for this position
Must be able to remain in a stationary position up to 50% of the time
Needs to occasionally move about inside the office to access file cabinets, office machinery, etc
Frequently communicates with co-workers, management, and customers, which may involve delivering presentations. Must be able to exchange accurate information in these situations
Preferred
Experience with automation platforms such as Puppet and Ansible
Knowledge of high-availability and clustered system architectures
Familiarity with IdAM technologies including PKI, LDAP, SAML, OAuth 2.0, OpenID Connect, and API Gateways
Proven experience collaborating within DevOps and Agile engineering teams
Proficiency using ticketing systems such as ServiceNow and JIRA
Understanding of network and cloud infrastructure technologies
Strong knowledge of patch management systems and group policy configuration
Company
MANTECH
ManTech is a technology company that offers cyber, IT, and data analytics technologies and solutions for security programs.
5001-10000 employees
Funding
Current Stage
Public CompanyTotal Funding
unknown2022-05-16Acquired
2002-02-07IPO
Leadership Team
Matt Tait
Chief Executive Officer & President
Gavin Greene
VP of Business Development
Recent News
2026-01-16
Washington Technology
2025-12-11
GlobeNewswire
2025-12-10
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