Senior Systems Engineer

General Overview
APEX TK is seeking a
Senior Systems Engineer
to support the Missile Defense Agency’s (MDA) Program Office delivering critical capabilities for the Defense of Guam (DoG). This role supports a priority national defense effort in a dynamic environment, ensuring effective integration of missile defense elements to protect a key strategic location. The selected candidate will provide senior-level systems engineering support, guiding technical efforts across multiple domains and ensuring alignment with MDA objectives.
What You'll Be Doing:
Serve as the Guam Interoperability Technical Lead identifying, prioritizing, and managing interoperability risks, issues, trouble reports and observations
Coordinate with GDS JPO, the services, and external developers to ensure external support to MDA component offices for development, integration and test assets
Champions all inter-element/inter-agency/service interoperability challenges to include tracking issue/trouble report progress and providing metrics to MDA leadership for all MDA Guam equities.
Supports AB, DC, DE, DT and the MDA Director in management of interoperability issues that impact MDA Guam commitments
Identifies and champions interoperability objectives for integration tests (e.g. JCIs, CDIs), exercises, test venues (e.g. development HWIL labs) and analysis venues to reduce design and interoperability risks prior to entering formal GDS testing
Ensures MDS component offices, developers and test/analysis teams receive all externally-furnished data, information, models, test assets, threat/scenario data, and requirements to design, develop, test and field MDA components
Perform integrated analysis and evaluation of DoG test events including Flight Tests, Ground Tests, and System Integration Check Out (SICO) activities
Participate in and support engineering milestones such as Preliminary and Critical Design Reviews (PDR/CDR), Test Readiness Reviews (TRRs), and technical assessments
Collaborate with stakeholders across MDA and supporting organizations to coordinate schedules, resolve issues, and ensure technical accuracy
Provide input on secure system design considerations, risk identification, and mitigation strategies
Lead or support technical interchange meetings (TIMs), action tracking, and meeting coordination
Develop executive-level briefings, technical papers, and correspondence for senior leaders, including Flag Officers and SES personnel
Coordinate GENser and SAP-level meetings and VTCs as needed
Represent the Government customer in IPTs, working groups, and forums
Apply engineering tools such as DOORS, Windchill, and Qlik for analysis and coordination
Support efforts related to system security, including compliance tracking or integration of cybersecurity inputs into engineering processes
What Required Skills You'll Bring:
Active Secret clearance
Master's Degree in STEM and 12+ years of related professional experience
Strong understanding of MDA systems engineering processes and procedures
Demonstrate understanding of system architecture and system
Experience with MDA system elements (e.g., Patriot, THAAD, Aegis, C2BMC)
Familiarity with secure development practices, configuration management, and
cybersecurity-informed engineering
Knowledge of the ETM-2 system and experience managing Congressional or routine taskers
Ability to operate independently and communicate effectively across diverse technical teams
Proficiency in Microsoft Office Suite (Outlook, Word, PowerPoint, Excel, Project)
Skilled in developing and delivering technical briefings to senior decision-makers​
What Desired Skills You'll Bring:
Preferred background that includes exposure to secure system development and cybersecurity-informed engineering practices
Bachelor's degree in STEM in addition to Master's degree in STEM