Senior Systems Engineer (TS/SCI Cleared) with Security Clearance

Senior Systems Engineer (TS/SCI Cleared) Who We Are ThinkTek LLC is a fast-growing Certified SBA 8(a) and Service-Disabled Veteran-Owned Small Business (SDVOSB) specializing in management and technology consulting for Federal Government modernization. We provide tailored solutions in Program & Project Management, Strategic Planning, and IT Operations. Position 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. Responsibilities * 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 Required Qualifications * 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 Desired Qualifications * 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 Pay Range The anticipated annual salary range for this position is $140,030 – $155,020. This range is a good-faith estimate and not a guarantee of compensation. Final compensation will be based on factors including experience, education, skills, geographic location, internal equity, market data, and applicable contract requirements, and may fall outside the posted range. ThinkTek LLC is proud to be an Equal Opportunity Employer (EOE), making decisions without regard to race, color, religion, creed, sex, sexual orientation, gender identity, marital status, national origin, age, veteran status, disability, or any other protected class. ThinkTek offers medical, dental, and vision insurance to all full-time employees; PTO and a variety of other paid leave options are also available. You can read more about ThinkTek benefits at https://www.thinktekllc.com/careers/.