Senior Cyber Security Engineer

MANTECH seeks a motivated, career and customer-oriented Senior Cyber Security Engineer to join our team in Chantilly, VA.

The Senior Cyber Security Engineer will leverage their strong technical background, PKI expertise, and identity management knowledge to support mission-critical cyber security solution delivery, testing, and system deployment across secure classified enterprise networks.

Responsibilities include but are not limited to:

• Maintaining operations of identity and access management services including directory services, user access controls, identity lifecycle workflows, Public Key Infrastructure (PKI), and privileged access management.
• Engineering, deploying, and maintaining Public Key Infrastructure (PKI) systems, digital certificates, cryptographic protocols, and multi-factor authentication (MFA) solutions.
• Maintaining critical infrastructure across Linux and Windows server environments in virtualized, on-premises, and cloud architectures.
• Performing routine and scheduled Linux and Windows operating system upgrades, security patches, baseline configurations, and system hardening.
• Managing Continuous Monitoring (CONMON) activities, vulnerability mitigations, and compliance reporting to maintain enterprise Authority to Operate (ATO).
• Providing structured status updates, technical documentation, and cross-functional coordination within an Agile and collaborative operational framework.

Minimum Qualifications:

• Bachelor's degree or 4+ years of additional experience in lieu of a degree
• 5+ years of professional experience
• Demonstrated hands-on experience supporting and maintaining Public Key Infrastructure (PKI), digital certificate lifecycle management, and authentication/authorization protocols.
• Hands-on system administration experience working across enterprise Linux and Windows operating systems in classified or unclassified environments.
• Working knowledge of directory services, LDAP/Active Directory administration, user account management, and database structures.
• Demonstrated ability to develop and implement automation scripts or workflow tracking solutions to optimize operational processes and system maintenance.
• Must have or be willing to obtain an IAT Level II certification within 3 months of hire.

Preferred Qualifications:

• Familiarity with configuration of Information Security Corp. (ISC) PKI products (CertAgent and CCMS)
• Direct experience implementing, maintaining, and troubleshooting enterprise PKI management tools and digital certificate services.
• Familiarity with configuration management, automation playbooks, or scripting platforms such as Ansible or PowerShell.
• Demonstrated experience collaborating within Agile, DevOps, or cross-functional technical teams.
• Prior military or Department of Defense operational background supporting mission-critical IT infrastructure, network security, and compliance workflows.

Clearance Requirements:

• An active TS/SCI with Polygraph is required.

Physical Requirements:

• Must be able to remain in a stationary position 50% of the time.
• Needs to occasionally move about inside the office to access file cabinets, office machinery, and technical equipment.
• Frequently communicates with co-workers, management, and customers, which may involve delivering technical briefings and operational updates. Must be able to exchange accurate information in these situations.