Principal Systems Administrator

MANTECH is seeking a talented Principal Systems Administrator to join our sustainment team in Chantilly, VA. This role supports a mission-critical enterprise environment, ensuring the continued health, performance, and compliance of complex network and system infrastructures. The selected candidate will play a key role in Operations and Maintenance (O&M) activities, applying strong technical expertise and collaborative problem-solving to maintain optimal system functionality.

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.

Minimum Qualifications

• Bachelor's degree or 4+ additional years of relevant experience in lieu of degree.
• 7+ years of combined 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) required.

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 Polygraph is required for this position.

Physical Requirements

• Ability to remain in a stationary position up to 50% of the time.
• Ability to operate standard office equipment including computers, calculators, copiers, and printers.
• Frequent communication with team members, management, and customers; must be able to exchange accurate information and deliver briefings as needed.