Senior Systems Administrator Security Clearance

Position: Senior Systems Administrator with Security Clearance
MANTECH seeks a motivated and skilled Senior Systems Administrator to join our 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. You will help drive key Operations and Maintenance (O&M) activities while leveraging strong technical expertise and collaborative problem-solving to maintain optimal system functionality.

Responsibilities include, but are not limited to:
* 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 Service Now 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 Git Lab and Confluence

* Conduct vulnerability scans, apply security patches, and ensure adherence to established cybersecurity standards

* Contribute to Dev Ops 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

Minimum Qualifications:

* 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 Dev Ops methodologies

* IAT Level II certification (GSEC, Security+, SSCP, or CCNA-Security)

Preferred Qualifications:

* 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 Dev Ops and Agile engineering teams

* Proficiency using ticketing systems such as Service Now and JIRA

* Understanding of network and cloud infrastructure technologies

* Strong knowledge of patch management systems and group policy configuration
Clearance Requirements:
* Active TS/SCI with CI Polygraph is required for this position

Physical Requirements:

* 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