Propulsion Systems Project Engineer

General information

Requisition # R65479 Locations USA-CA-El Segundo Posting Date 01/27/2026 Security Clearance Required None Remote Type Onsite Time Type Full time

Description & Requirements

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MANTECH seeks a skilled and motivated Propulsion Systems Project Engineer to support the U.S. Space Force Space Systems Command (SSC), Launch Enterprise Directorate (SMC/LE), in executing the National Security Space Launch (NSSL) Program. This position is located in El Segundo, CA.

You will play a pivotal role in validating launch vehicle propulsion systems—ensuring these systems meet mission needs and are ready to safely and reliably deliver critical National Security Space (NSS) payloads. This position offers the opportunity to contribute to groundbreaking missions involving new launch vehicles such as ULA’s Vulcan and SpaceX Falcon systems.

Responsibilities include, but are not limited to:

As a Propulsion Systems Project Engineer, you will support launch vehicle propulsion system integration and readiness across design, manufacturing, and launch operations phases.

• Provide systems and technical project engineering support for both recurring and non-recurring design validation of launch vehicles used in NSSL missions

• Participate in propulsion system design reviews, working groups, and Engineering Review Boards (ERBs); assess propulsion component test plans and review completed technical documentation for quality and completeness

• Collaborate across multidisciplinary teams including Contractors, Vendors, FFRDCs, and Space Force stakeholders; contribute to risk and schedule management processes

• Support rehearsals, launch operations, and anomaly resolution; prepare certification and training material and document lessons learned

• Contribute to the development and evolution of Day of Launch tools, CONOPs, and technical processes

• Conduct integrated technical assessments of launch vehicle and pad design, testing, manufacturing, and operations; manage engineering data, perform data mining, and deliver technical reporting

• Plan, coordinate, and present briefings at Chief Engineer Review Boards and interface regularly with Aerospace Corporation, Launch Service Providers (LSPs), and factory and launch site teams

Minimum Qualifications:

• Bachelor’s degree in mechanical engineering, Aerospace Engineering, or other STEM discipline

• 10+ years of experience in aerospace or mechanical engineering fields, with at least 3 years in NSSL, Launch/Range, DoD, NA