Systems Engineer Level 3

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
.

• 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.

• 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.

• 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.

• 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