MANTECH seeks a motivated, career and customer-oriented Senior Systems Administrator to join our team working in Crane, IN. This is a fulltime onsite position.

Responsibilities include but are not limited to:

• Design, implement, maintain, and support enterprise Microsoft Active Directory (AD) environments.

• Support enterprise network services by administering and optimizing GPO design, DNS, DHCP, and Windows Enterprise PKI

• Manage and support Public Key Infrastructure (PKI), including digital certificate issuance and validation across hybrid environments.

• Enhance and secure identity infrastructures through authentication, authorization, and access control policies.

• Troubleshoot and resolve issues related to domain services and directory integration.

• Collaborate with IT security and infrastructure teams to strengthen enterprise identity management and compliance.

• Apply understanding of authentication protocols such as Kerberos, LDAP, and SAML to enhance secure system access and identity management

• Operate in hybrid IT environments, integrating and supporting both on-premises infrastructure and cloud-based systems to meet mission and operational goals

Minimum Qualifications:

• High school diploma or equivalent

• 7+ years of systems administration or related experience

• Must have demonstrated experience in both active directory and PKI service administration

• Must possess one of the following certifications: CASP+, CISSP, or equivalent DoD 8570 baseline IAT 3 certification

Preferred Qualifications:

• Bachelor’s degree in an IT related field

• Microsoft Certified: Identity and Access Administrator Associate, or equivalent.

• Demonstrated expertise in Active Directory architecture and administration.

Clearance Requirements:

• Must be a U.S. Citizen and have the ability to obtain and maintain a Secret security clearance.

• Candidate will be required to obtain an interim Secret clearance before onboarding

Physical Requirements:

• The person in this position must be able to remain in a stationary position 80% of the time.

• Occasionally move about inside the office to access file cabinets, office machinery, or to communicate with co-workers, management, and customers, via email, phone, and or virtual communication, which may involve delivering presentations.