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Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Senior Systems Engineer (TS/SCI Cleared) - **Company:** ThinkTek LLC - **Location:** Washington, DC, United States - **Experience:** Expert - **Salary:** $140,030.0 - $155,020.0 - **Contract:** Permanent contract - **Skills:** Application Firewall, Systems Engineering, Identity and Access Management, Information Technology Operations, Network Security, Network Architecture, Network Diagrams, Routing, Wireless Networks, Information Technology - **Published:** August 5, 2026 - **Apply:** https://www.indeed.com/viewjob?jk=53787e45dd83fdd8 ## About the Role * Active Top Secret security clearance * DoD 8140/8570 IAT Level II baseline certification (e.g., Security+ or equivalent) * 5+ years of hands-on systems or network engineering experience in DoD or Federal environments, including routing, switching, firewall administration, and secure network integration * Working knowledge of the CSfC program, its Capability Packages, and the registration process * Demonstrated understanding of network architecture, transport security, encryption, and DoD security hardening standards (e.g., DISA STIGs) * Experience producing technical documentation, network diagrams, and implementation plans, and briefing technical content to Government stakeholders * Bachelor's degree in computer science, information technology, engineering, or a related field; equivalent experience may substitute, * Direct experience developing CSfC registration packages and engaging the NSA CSfC PMO * Higher-level DoD 8140/8570 certification (IAT Level III or IAM Level II, such as CISSP, CASP+, or CCNP Security) * Familiarity with RMF documentation and ATO processes * Experience with wireless infrastructure (access points, controllers, site surveys) * Experience integrating new or emerging technologies into classified DoD networks * Active Top Secret clearance with SCI eligibility ## Description ThinkTek is seeking a Senior Systems Engineer to support a Department of Defense client in the National Capital Region. This role leads the hands-on execution of an emerging secure wireless capability, spanning hardware and software integration into a classified network environment. The Senior Systems Engineer serves as the technical lead across network engineering and cybersecurity accreditation, working closely with the Solutions Architect, the technology vendor, and Government stakeholders to move the capability from design through deployment. Knowledge of the NSA Commercial Solutions for Classified (CSfC) program and its registration process is central to the role., * Lead the hands-on execution of system deployment, including configuration, integration, and testing of network and security infrastructure within a classified environment * Serve as the technical lead for CSfC registration, developing the registration package and engaging the NSA CSfC Program Management Office (CSfC PMO) to navigate requirements and guidance gaps for emerging technologies * Support the development of Risk Management Framework (RMF) artifacts required to achieve and maintain an Authority to Operate (ATO) * Integrate the capability into the existing network, coordinating deployment activities through established change management processes and producing technical documentation, network diagrams, and as-built records * Serve as a technical point of contact to Government stakeholders and subcontractors, translating requirements across the vendor, engineering, and accreditation teams ## Related Videos - [Small, Secure, Interconnected: The next Internet Protocol](https://www.wearedevelopers.com/videos/100062-small-secure-interconnected-the-next-internet-protocol) - [Security Pitfalls for Software Engineers](https://www.wearedevelopers.com/videos/726-security-pitfalls-for-software-engineers) - [How Data is Shaping our Games](https://www.wearedevelopers.com/videos/176-how-data-is-shaping-our-games) - [Creating a routing app with Google Maps API from scratch](https://www.wearedevelopers.com/videos/831-creating-a-routing-app-with-google-maps-api-from-scratch) - [Demystifying application networking in the cloud](https://www.wearedevelopers.com/videos/675-demystifying-application-networking-in-the-cloud) - [What makes Cybersecurity different for critical infrastructure?](https://www.wearedevelopers.com/videos/571-what-makes-cybersecurity-different-for-critical-infrastructure) ## Related Articles - [How We Built a Worry-Free System That Runs for 10+ Years – And What We’d Do Again](https://www.wearedevelopers.com/magazine/751-how-we-built-a-worry-free-system-that-runs-for-10-years-and-what-we-d-do-again) - [Best Paying Jobs in Technology](https://www.wearedevelopers.com/magazine/256-best-paying-jobs-in-technology) - [Events like RSAC Get You CISOs. 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