Senior Mechanical Engineer

San Jose, CA, United States Aerospace Full-time $145k to $175k Posted Nov 6, 2026
Apply on Momentus (opens in a new tab) Sourced via job-boards.greenhouse.io · Posted 2026-11-06

About this role

Momentus is hiring a Senior Mechanical Engineer, full-time, on-site in San Jose, CA, United States, in the Aerospace sector.

OUR COMPANY

As an early mover in the in-space transportation and infrastructure services, Momentus is at the forefront of the commercialization of space. With an experienced team of aerospace, propulsion, and robotics engineers, Momentus has developed a cost-effective and energy-efficient in-space transport system.

OUR PEOPLE

Daring problems require daring solutions. We boldly charge into uncharted territory knowing that no matter the outcome we will benefit from the journey and move closer to our goals no matter what. Our teams know that working at Momentus means more than building innovative technology, it means creating entirely new markets in the space economy. We are level-headed, business-minded strategic thinkers intent on providing immediate value to our customers today while simultaneously preparing for the vast possibilities of the future. If this sounds like you, we should talk.

JOB SUMMARY

The Senior Mechanical Engineer will participate in the mechanical, structural, and thermal design of flight spacecraft and will follow programs through execution of assembly, integration, and test. The ideal candidate should be accustomed to working in a fast-paced environment and quickly adapting to new challenges.

Key Responsibilities

  • Mechanical design of spacecraft components including primary structure, support structure, brackets, electronics enclosures, bulkheads, wire harness, and more.
  • Design of components and assemblies in CAD. Solidworks. Duro PLM.
  • Routing of plumbing lines for propellant feed system and thrusters.
  • Work with structural analysts to ensure structural integrity of the spacecraft and all components during all phases of launch.
  • Work with thermal analysts to ensure all components are maintained within acceptable temperature limits.
  • Conduct mechanical testing of systems and components including vibration testing, static load testing, and shock testing.
  • May be asked to support TVAC testing on an as-needed basis.

Required Skills and Experience

  • Demonstrated experience with detail design of mechanical hardware.
  • Experience defining requirements for mechanical systems and components.
  • Familiarity with the space environment and how it affects mechanical hardware.
  • Familiarity with material selection and material coatings for space applications.
  • General understanding of spacecraft structural loads (quasi-static loads, random vibration, shock, thermo-mechanical)
  • Ability to work independently.
  • Excellent technical communications skills.
  • Good written and verbal communications skills.

Desired Skills and Experience

  • Experience designing, manufacturing, and testing space hardware with demonstrated on-orbit success.
  • Experience running TVAC tests.
  • Thermal and fluidic analysis experience is a strong asset.

Education & Work Experience

  • BS in Mechanical Engineering or Engineering Mechanics
  • 5-10 years relevant experience.

Compensation:

Annual Base Salary Range: $145,000 - $175,000/per year

Base pay is one part of our total compensation package (base+bonus+equity) and is determined within a range. Your actual base salary will be determined on job-related knowledge and skills, education, and experience. Our benefit plans include medical, dental, and vision insurance, 401k retirement plan, short and long term disability and life insurance. We also offer flexible PTO, along with 11 paid holidays, sick time and paid parental leave.

This is a full-time position in San Jose, California. This position requires access to export-controlled commodities, technical data, technology, software, and services. U.S. citizenship, U.S. legal permanent resident status, or protected person status under 8 U.S.C. § 1324b(a)(3) is required.

To all recruitment agencies: Momentus does not accept agency resumes. Please do not forward resumes to our employees or any company email. Momentus will not be responsible for any fees related to unsolicited resumes.

Description from Momentus's official posting. Always confirm details on the company careers page.

Apply on Momentus Applications go directly to Momentus. Curated by Larry Sherwood Jr.

About Momentus

Momentus

Company in the mobility sector tracked nightly on the Mobility Jobs board.

Ready to apply?
Apply on Momentus (opens in a new tab) You'll be redirected to job-boards.greenhouse.io to complete your application.

Not the one? Get new Aerospace roles by email, weekday mornings, only when something new lands.

Larry Sherwood Jr.

About Larry Sherwood Jr.

Talent Acquisition Leader specializing in mobility, EV, and frontier tech. 1,000+ hires across roles ranging from production technicians to VPs, including 48 hires for the AFEELA U.S. launch at Sony Honda Mobility (98% offer acceptance, $1.5M+ agency savings). SHRM-CP certified. Build recruiting functions from scratch, no agencies.

SONY HONDA MOBILITYFISKERSHRM-CP1,000+ HIRES

Currently open to senior TA leadership roles in the United States. larrysherwoodjr.com · Resume (PDF)

Read Larry's guides →
Job no longer open? Let me know

Curated by Larry Sherwood Jr. on the free Mobility Jobs board. Pulled nightly from company applicant tracking systems. Apply directly on the source link above to be considered.