Model- Systems Engineer; Highbury Defense Group

Model-Based Systems Engineer (Highbury Defense Group)

This position requires an active U.S. national security clearance. To learn more about the security clearance process please access this link.

Accelint is a mission-driven technology company focused on strengthening national security and supporting critical industries. We build the technologies that help operators and organizations see what’s happening, make faster and better decisions, take action with confidence, and stay ready for what comes next. Our work includes advanced sensors, autonomous systems, mission command and control software, AI-enabled training and simulation, and tools that improve logistics, maintenance, and overall readiness.

For nearly 30 years we have supported military and civilian agencies across the Department of Defense, U.S. allies and partners, and essential industries. When you join Accelint, your work directly contributes to protecting national security and strengthening the systems our society depends on.

Accelint brings together the talents of Hypergiant, Forward Slope, Systems Innovation Engineering, Soar Tech, and Highbury Defense Group under one mission, with each entity contributing deep expertise in its domain. This role is part of our Highbury Defense Group (HDG) division, which specializes in C2, systems engineering, cyber, and international mission support. HDG brings decades of experience supporting the DoD, Department of State, and allied partners, delivering practical, technically rigorous solutions that strengthen operational readiness around the world.

Full time

This position is hybrid located in San Diego, CA and typically requires on-site work of 3 days per week (Tues/Wed/Thur).

• Develop and maintain system architecture models using SysML and MBSE tools (e.g., Cameo/Magic Draw, Rhapsody, Enterprise Architect)
• Facilitate the development of Black Box and White Box models in accordance with DoD and NAVWAR standards
• Work closely with program engineering teams to develop questionnaires to identify what data is available for each program that can feed into a model, then help match programs with the appropriate MBSE automation tool(s) and enter data into the appropriate MBSE tool.
• Integrate MBSE approaches with traditional systems engineering practices and digital engineering frameworks
• Translate stakeholder requirements into system models and technical specifications
• Participate in or lead technical reviews, model-based design efforts, and system verification/validation planning
• Collaborate with software, hardware, and integration teams to align models with implementation and testing
• Support DoD acquisition documentation and milestone reviews (e.g., SRR, PDR, CDR)
• Ensure models comply with DoD standards (e.g., DoDAF, UAF, MIL-STD-881, NIST 800-160 Vol 1/2)
• Prepare technical documentation and present modeling results to stakeholders, including government clients
• Maintain configuration control of models and support versioning and reuse strategies

• Currently holds an active U.S. national security clearance or be able to receive and maintain one. To learn more about the security clearance process please access this link.
• 5+ years of experience in systems engineering with at least 2 years in MBSE roles.
• Proficiency in MBSE tools such as Cameo/Magic Draw, Rhapsody, or Enterprise Architect.
• Experience with Black Box and White Box modeling and development.
• Experience with SysML and formal modeling techniques including Black and White Box Models.
• Familiarity with DoD systems lifecycle (DoDI 5000.02, JCIDS, etc.) and C4I engineering processes.
• Experience supporting DoD programs (Army, Navy, Air Force, Space Force, or OSD).
• Active Secret clearance required.
• Bachelor's in systems engineering, Aerospace, Electrical Engineering, Computer Science, or a related field.

Some positions will require access to U.S. National Security information. Positions that require this access will be required to receive and maintain a U.S. government personnel security clearance (PCL). In order to qualify for this position, the candidate must be a US Citizen and either currently possess this…