Systems Engineer Level 4 with Security Clearance

Zachary Piper Solutions is seeking a Model-Based Systems Engineer (MBSE) Level 3 to support advanced aerospace and defense programs within a leading national security organization. You'll join a high-impact Systems Engineering & Integration team driving next-generation autonomous and weapons system development across highly complex, proprietary programs. This role is ideal for engineers who thrive in fast-paced environments and want to contribute directly to mission-critical, cutting-edge systems. This role is fully onsite in St. Louis, Missouri or Seattle, Washington . Candidates must hold an active secret clearance . Responsibilities Include: * Support cross-functional engineering teams in developing advanced autonomous and complex systems aligned with program milestones and customer expectations. * Implement and mature Model-Based Systems Engineering (MBSE) methodologies within a Digital Engineering ecosystem. * Develop and maintain system architectures, requirements, and interfaces using tools such as Cameo , MSOSA , and SysML . * Execute full lifecycle systems engineering activities, including: * Requirements decomposition & traceability * System architecture modeling * Interface definition & management * Operational and environments analysis * Specification development * Trade studies and technical assessments * Risk identification & mitigation * Verification, validation, and test planning * Certification planning & execution * Support technical reviews, documentation, and customer-facing deliverables. * Collaborate with SMEs across multiple engineering disciplines to integrate complex system capabilities. Required Qualifications: * Bachelor's degree in Engineering, Engineering Technology, Computer Science, Physics, Mathematics, Chemistry, or related technical field. * 5+ years of engineering experience with a Bachelor's, 3+ years with a Master's, or relevant experience with a PhD. * Hands-on experience with MBSE , Cameo/MSOSA , and/or SysML . * Active Secret Clearance (required prior to start). * Ability to work 100% onsite in St. Louis or Seattle. Preferred Skills: * Experience supporting proprietary or classified aerospace/defense programs. * Background in autonomy, mission systems, or advanced weapons system development. * Familiarity with Digital Engineering pipelines and model-based lifecycle integration. * Strong communication skills and comfort working with multidisciplinary engineering teams. Compensation and Benefits: * Salary Range: $90,000-$160,000 **depending on experience** * Full Benefits: Cigna Medical, Dental, Vision, 401K, PTO, Sick Leave if required by law, and Holidays