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Spacecraft Thermal Engineer (Mid-Career) - Millennium Space Systems

Los Angeles, California; El Segundo, California Job ID JR2026489984 Category Engineering - Mechanical & Structural Role Type Onsite Post Date Jan. 02, 2026 Security Clearance Required
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Job Description

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Job Description

Spacecraft Thermal Engineer (Mid-Career) – Millennium Space Systems

Millennium Space Systems (MSS), a part of Boeing Defense, Space and Security (BDS) is seeking a Spacecraft Thermal Engineer (Mid-Career) to support our team in El Segundo, CA!

Job Summary

As a Mission Operations Engineer, you will be the lead technical authority for Millennium’s on-orbit spacecraft.  Your work will encompass the entire spacecraft mission life cycle, from the proposal phase to spacecraft and mission design, through space vehicle integration and test, and culminating with launch and on-orbit operations.  You will be responsible for all facets of the mission design, including definition of operational concepts, development of on-orbit procedures, and innovation of advanced methods of spacecraft operation unique to each space mission.  Mission Operations requires composure in high-pressure situations, in-depth knowledge of both the space vehicles and ground segment, and an ability to respond to anomalous scenarios in real-time.  You will be directly responsible for Millennium’s critical on-orbit assets. 

This position’s internal job code is Systems Engineer. Our team is currently hiring for levels 1-2.

Job Summary
Thermal Engineers support the Spacecraft Development Program Managers and Chief Systems Engineer through the development of all spacecraft thermal system configurations, designs, analyses, testing, and flight operations. Spacecraft thermal subsystem elements includes all passive and active means of controlling the satellite’s system, subsystem, and component environments within both operating and survival limits during all pertinent system lifetime activities. Thermal engineers also have the opportunity to support MLI blanket design, fabrication, and installation.

This position’s internal job code is Mechanical System Design & Analysis Engineer. Our team is currently hiring for a level 3-4. 

Responsibilities

  • Perform spacecraft thermal design and analyses at the board, component, subsystem, and system level 
  • Develop systems and spacecraft element thermal models to predict thermal loads, impacts, and temperature margins to support system design
  • Brief design and analysis materials to program managers, customers, and/or sponsors
  • Identify all materials, processes, and facilities to achieve a qualified spacecraft thermal design and operation
  • Assists in proposal and new business development efforts
  • Support thermal verification testing on spacecraft systems and components including test design, test conduct, data reduction, analysis, and reporting 
  • Support the development of tools to aide in conceptual designs and post-processing analysis
  • Potential to cross-train with MLI team for hands-on support

This position is expected to be 100% onsite. The selected candidate will be required to work onsite at one of the listed location options. 

Security Clearance and Export Control Requirements

This position must meet Export Control compliance requirements, therefore a “US Person” as defined by 22 C.F.R. § 120.15 is required. “US Person” includes US Citizen, lawful permanent resident, refugee, or asylee.

Minimum Qualifications

  • Bachelor’s degree in Mechanical Engineering, Aerospace Engineering, Physics, or other relevant fields
  • 2 or more years of experience in the design, development, analysis, implementation, testing, and/or operation of spacecraft thermal systems or other related complex thermal systems
  • Proficiency with thermal analysis tools (e.g. Thermal Desktop, SINDA/FLUINT, ANSYS, Thermica)
  • Ability to obtain and maintain a TS/SCI Security Clearance 

Preferred Qualifications

  • Active TS/SCI Clearance

Conflict of Interest:

Successful candidates for this job must satisfy the Company’s Conflict of Interest (COI) assessment process

Drug Free Workplace:

Millennium Space Systems, a Boeing Company, is a Drug Free Workplace (DFW) where post offer applicants and employees are subject to testing for marijuana, cocaine, opioids, amphetamines, PCP, and alcohol when criteria is met as outlined in our policies.

Shift:

  • This role will be on 1st

Total Rewards:

At Millennium Space Systems, a Boeing Company, we strive to deliver a Total Rewards package that will attract, engage and retain the top talent.  Elements of the Total Rewards package include competitive base pay and variable compensation opportunities.  

Millennium Space Systems also provides eligible employees with an opportunity to enroll in a variety of benefit programs, generally including health insurance, flexible spending accounts, health savings accounts, retirement savings plans, life and disability insurance programs, and a number of programs that provide for both paid and unpaid time away from work.  

The specific programs and options available to any given employee may vary depending on eligibility factors such as geographic location, date of hire, and the applicability of collective bargaining agreements.

Pay is based upon candidate experience and qualifications, as well as market and business considerations.

Summary Pay-Range

  • Level 3: $102,000 - $150,000 
  • Level 4: $124,100 - $182,500

Applications for this position will be accepted until Feb. 09, 2026


Export Control Requirements:

This position must meet U.S. export control compliance requirements. To meet U.S. export control compliance requirements, a “U.S. Person” as defined by 22 C.F.R. §120.62 is required. “U.S. Person” includes U.S. Citizen, U.S. National, lawful permanent resident, refugee, or asylee.

Export Control Details:

US based job, US Person required

Education

Bachelor's Degree or Equivalent Required

Relocation

Relocation assistance is not a negotiable benefit for this position.

Security Clearance

This position requires the ability to obtain a U.S. Security Clearance for which the U.S. Government requires U.S. Citizenship. An interim U.S. Secret Clearance Pre-Start and final U.S. Secret Clearance Post-Start is required.

Visa Sponsorship

Employer will not sponsor applicants for employment visa status.

Shift

This position is for 1st shift


Equal Opportunity Employer:

Boeing is an Equal Opportunity Employer. Employment decisions are made without regard to race, color, religion, national origin, gender, sexual orientation, gender identity, age, physical or mental disability, genetic factors, military/veteran status or other characteristics protected by law.

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