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

Boeing

USA - El Segundo, CAPosted Oct 1, 2026Discovered via the company's careers siteMatch locked

On-siteFull time2+ years exp

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About the role

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

Company

Millennium Space Systems Job Description Millennium Space Systems, a part of Boeing Defense, Space and Security (BDS), is a fast, agile small satellite company focused on national security space. Our missions have direct impact to global security, like missile warning and Earth observation. Our team is curious, bold and innovative. We take risks, innovate and explore new techniques and technologies. We influence change because we challenge the status quo. And when we watch our satellites launch, we know each one of us made it happen.

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

Millennium is DDTC-registered, ITAR-compliant Company. This position is located at a facility that requires special access. Applicants MUST be U.S. citizens and eligible for a security clearance. Additionally, applicants must be willing to apply for and maintain a security clearance. We encourage all interested candidates to apply for any open position for which they feel they are qualified.

Category = Engineering

Language Requirements

Not Applicable

Education

Bachelor's Degree or Equivalent

Relocation

Relocation assistance is not a negotiable benefit for this position.

Export Control Requirement

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.

Safety Sensitive

This is not a Safety Sensitive 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 and/or final U.S. Secret Clearance Post-Start is required.

Visa Sponsorship

Employer will not sponsor applicants for employment visa status.

Contingent Upon Award Program

This position is not contingent upon program award

Shift

Shift 1 (United States of America) Stay safe from recruitment fraud! The only way to apply for a position at Boeing is via our Careers website. Learn how to protect yourself from recruitment fraud - Recruitment Fraud Warning 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. EEO is the law Boeing EEO Policy Request an Accommodation Applicant Privacy

Boeing Participates in E – Verify

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Right to Work Statement

Right to Work (English)
Right to Work (Spanish)

Not included in the source posting: benefits.

Skills

typescriptagile

Who can apply

The employer didn't state any visa, work authorization, citizenship or clearance requirements in this posting. Confirm with the employer before applying.

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