Senior Systems Administrator

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 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

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 DevOps 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 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

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