Momentus · 1 month ago
Mechanical Propulsion Engineer
San Jose, CA, United States
Full-time
Onsite
Mid Level
$125K/yr - $150K/yr
3+ years expMomentus is an early mover in the in-space transportation and infrastructure services, focusing on the commercialization of space. They are seeking a Mechanical/Propulsion Engineer to work on spacecraft hardware and propulsion system development, blending mechanical design with cross-functional collaboration to support AIT execution and spacecraft hardware integration.
AerospaceSpace TravelTransportation
No H1B
U.S. Citizen Only
Responsibilities
Execute hands-on assembly and testing of propulsion systems, including tubing, heaters, sensors, valves, and other fluid-system hardware
Develop 3D CAD models, detailed part/assembly drawings, tolerance analyses, and integrated layouts optimized for tightly constrained spacecraft environments
Design spacecraft hardware such as brackets, enclosures, fluid-routing solutions, thermal/mechanical interfaces, and structural components
Generate models, documentation packages, and work instructions to support AIT (Assembly, Integration & Test) for propulsion and spacecraft mechanical hardware
Collaborate closely with structural, thermal, analysis, and manufacturing teams to iterate designs through the full engineering lifecycle—from early concepts to flight-ready hardware
Support propulsion and mechanical test campaigns, including setup, execution, data review, troubleshooting, and documentation
Apply aerospace standards—including range safety guidelines and RPUG requirements—to ensure compliance, safety, and mission success
Contribute to process development, continuous improvement, and flight-readiness maturation for mechanical and propulsion subsystems
Qualification
Required
Mechanical / Propulsion Engineer with a strong hands-on background in spacecraft hardware and propulsion system development
Execute hands-on assembly and testing of propulsion systems, including tubing, heaters, sensors, valves, and other fluid-system hardware
Develop 3D CAD models, detailed part/assembly drawings, tolerance analyses, and integrated layouts optimized for tightly constrained spacecraft environments
Design spacecraft hardware such as brackets, enclosures, fluid-routing solutions, thermal/mechanical interfaces, and structural components
Generate models, documentation packages, and work instructions to support AIT (Assembly, Integration & Test) for propulsion and spacecraft mechanical hardware
Collaborate closely with structural, thermal, analysis, and manufacturing teams to iterate designs through the full engineering lifecycle—from early concepts to flight-ready hardware
Support propulsion and mechanical test campaigns, including setup, execution, data review, troubleshooting, and documentation
Apply aerospace standards—including range safety guidelines and RPUG requirements—to ensure compliance, safety, and mission success
Contribute to process development, continuous improvement, and flight-readiness maturation for mechanical and propulsion subsystems
Hands-on experience with propulsion system build-up and testing, including fluid systems, heaters, wiring/sensors, or valve integration
Mechanical design proficiency using modern CAD tools; experience with GD&T, tolerance stack-ups, and drawing release workflows
Familiarity with spacecraft packaging constraints, tight-tolerance interfaces, and multidisciplinary integration challenges
Working understanding of propulsion-system fundamentals, thermal behavior, or fluid dynamics
Knowledge of aerospace standards (range safety, RPUG, etc.) or prior experience working with flight hardware
Strong documentation skills and the ability to produce clear, concise technical communication
Effective collaborator in hands-on, cross-functional engineering environments; capable of taking hardware from bench to flight
BS in Mechanical Engineering, Aerospace Engineering, or related field
3+ years relevant experience
3 to 5 years of on-the-job engineering experience
Desire to contribute to a highly hands-on engineering setting involving design, integration, testing, and flight hardware ownership
U.S. citizenship, U.S. legal permanent resident status, or protected person status under 8 U.S.C. § 1324b(a)(3) is required
Benefits
Medical, dental, and vision insurance
401k retirement plan
Short and long term disability and life insurance
Flexible PTO
11 paid holidays
Sick time
Paid parental leave
Company
Momentus
Momentus is a commercial space company providing satellite buses, in-space transportation, hosted payloads, and in-orbit services.
51-200 employees
Funding
Current Stage
Public CompanyTotal Funding
$182.12MKey Investors
J.J. Astor & Co.Space Infrastructures VenturesPrime Movers Lab
2026-01-05Post Ipo Equity· $5M
2025-10-14Post Ipo Equity· $7M
2025-06-30Post Ipo Equity· $4M
Leadership Team
Rob Schwarz
CTO
Eric Williams
CFO
Recent News
Benzinga.com
2026-01-13
2026-01-09
Company data provided by crunchbase