Senior Cyber Security Engineer

MANTECH•Chantilly, VA

2d•$114,600 - $190,200•Onsite

About The Position

MANTECH seeks a motivated, career- and customer-oriented Senior Cyber Security Engineer to join its team in Chantilly, Virginia. The engineer will use a strong technical background, PKI expertise, and identity management knowledge to support the delivery, testing, and deployment of mission-critical cybersecurity solutions across secure classified enterprise networks.

Requirements

Bachelor’s degree or at least 4 additional years of experience in lieu of a degree.
At least 5 years of professional experience.
Hands-on experience supporting and maintaining PKI, digital certificate lifecycle management, and authentication/authorization protocols.
Hands-on system administration experience 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.
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.
Active TS/SCI with Polygraph clearance required.

Nice To Haves

Familiarity with configuring Information Security Corp. (ISC) PKI products, including 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.
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.

Responsibilities

Maintain identity and access management services, including directory services, user access controls, identity lifecycle workflows, Public Key Infrastructure (PKI), and privileged access management.
Engineer, deploy, and maintain PKI systems, digital certificates, cryptographic protocols, and multi-factor authentication (MFA) solutions.
Maintain critical infrastructure across Linux and Windows server environments in virtualized, on-premises, and cloud architectures.
Perform routine and scheduled Linux and Windows operating system upgrades, security patching, baseline configurations, and system hardening.
Manage Continuous Monitoring (CONMON) activities, vulnerability mitigations, and compliance reporting to maintain enterprise Authority to Operate (ATO).
Provide structured status updates and technical documentation, and coordinate across functions within an Agile and collaborative operational framework.