Mechanical Engineer II, Spacecraft Structures & Missions

Muon Space•San Jose, CA

1d•$144,000 - $177,000•Hybrid

About The Position

Muon seeks a Mechanical Engineer to join our Spacecraft Structures & Missions team. This group tailors Muon's spacecraft platforms to specific customer missions. In this role, you will own the mechanical execution of a mission end-to-end, starting from platform building blocks, designing payload accommodations and mission-specific components, and carrying the spacecraft through integration, environmental test, and delivery to the launch vehicle. You will work alongside senior and staff engineers and partner closely with Muon's dedicated structural and thermal analysis groups, with opportunities to grow ownership over time. This position is hybrid and requires working on-site in our San Jose, CA office three days per week.

Requirements

5+ years of experience designing, building, and testing mechanical hardware for complex systems
Experience taking hardware from concept through build and test
Structural analysis fundamentals: hand calculations, margin assessment, and familiarity with FEA
Proficiency in CAD for medium-to-large assembly design and management (SolidWorks preferred)
Solid command of drawings, GD&T, BOMs, and tolerance/mass budgets
Excellent communication and cross-functional coordination skills
A strong desire to learn and contribute in a fast-paced, dynamic environment
B.S. or higher in Mechanical Engineering or related field

Nice To Haves

Space industry experience — spacecraft, launch vehicles, or flight hardware
Experience running or supporting environmental test campaigns (vibration, TVAC)
Hands-on FEA experience (FEMAP/NASTRAN, ANSYS, or similar)
Experience with PLM systems and formal change control
Experience with deployable hardware or precision mechanisms
Software skills in Python, MATLAB, or similar

Responsibilities

Own the mechanical execution of an assigned mission end-to-end — from requirements through design, build, integration, and environmental test — with support from senior engineers
Tailor Muon's platform components to mission needs and design new mission-specific components and payload accommodations
Create and manage spacecraft-level mechanical assemblies in SolidWorks, including envelopes, interfaces, and configuration control
Perform first-order structural and thermal sizing to guide your designs, partnering with Muon's dedicated structural and thermal analysis groups for detailed analysis
Produce and release engineering documentation: drawings, GD&T, BOMs, and tolerance/mass budgets through ECO/DCO processes
Support environmental test campaigns (vibration, TVAC) and spacecraft integration alongside production and test teams
Write build procedures and support hardware assembly and integration on the floor
Present your work in design reviews (PDR, CDR, MRR) and coordinate across systems, thermal, avionics, and payload teams