Sr Systems Engineer with Security Clearance
TEKsystems c/o Allegis Group Dallas
Sr Systems Engineer What You'll Do
-Lead the design and deployment of Active Directory forest and domain architecture, including multi-domain and multi-forest environments-Architect and implement Active Directory Federation Services (ADFS) solutions to enable single sign-on (SSO) across classified and unclassified systems
-Design and configure cross-domain and cross-forest trust relationships in complex, segmented network environments
-Develop and enforce role-based access control (RBAC) frameworks, group policy objects (GPOs), and delegation models aligned with least-privilege principles-Align directory services architecture with DISA STIG requirements, NIST 800-53 controls, and program-specific security policies
-Collaborate with cybersecurity teams to support ATO processes, RMF documentation, and identity-related continuous monitoring requirements
- Serve as the subject matter expert for identity and directory services, providing technical leadership and mentorship to junior engineers
- Evaluate emerging identity and access management technologies and recommend solutions aligned with program roadmaps and government requirements
- Produce and maintain technical documentation including forest design diagrams, trust maps, RBAC matrices, and configuration baselines
What You Bring
-8–10+ years of hands-on experience in systems engineering with deep expertise in Active Directory architecture and identity management-Demonstrated experience designing and deploying AD forest and domain structures in large-scale enterprise or government environments
-Strong working knowledge of ADFS, SSO federation protocols (SAML, OAuth, WS-Federation), and identity provider configuration
-Experience designing and managing cross-domain and cross-forest trust relationships in segmented or classified network environments
-Deep understanding of RBAC frameworks, GPO design, and least-privilege access models
-Working knowledge of DISA STIGs, NIST 800-53, and RMF as applied to directory services and identity infrastructure
- Active Top Secret security clearance required; TS/SCI eligibility strongly preferred
- Microsoft certifications (MCSE, Azure AD, or equivalent) a strong plus
- Prior experience supporting classified programs in a DoD, IC, or cleared defense contractor environment
- Familiarity with Azure Active Directory, hybrid identity architectures, and cloud identity integration
- Experience with Privileged Access Management (PAM) solutions such as CyberArk or BeyondTrust
- Familiarity with PKI infrastructure, certificate services, and smart card authentication in DoD environments
- Experience with PowerShell scripting for AD automation and administration
- Bachelor's degree in Computer Science, Information Technology, Systems Engineering, or a related field; equivalent experience considered
- DoD 8570/8140 IAT Level II or III certification (Security+, CASP+, CISSP, or equivalent)
TEKsystems c/o Allegis GroupRichardson, 4 mi from Dallas
This engagement centers on the build-out and deployment of a Secure Development Environment (SDE), with work taking place across two key locations in Richardson, TX and Cedar Rapids, IA. The Sr. Systems Engineer must be familiar with the following: - AD forest...
TEKsystems c/o Allegis GroupRichardson, 4 mi from Dallas
Top Skills - Must Haves
Systems engineering
Active directory
AD FS SSO
Trust Configuration
RBAC Mapping
Security Alignment Secondary Skills - Nice to Haves
Architecture
Design
Systems architecture Job Description
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