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: