Spacecraft Thermal Engineer (Early Career) - Millennium Space Systems

About the Position

Bring your ideas to life at Boeing's Millennium Space Systems, a part of Boeing Defense, Space and Security (BDS). We are a fast, agile small satellite company focused on national security space. Our missions have a direct impact on global security, such as missile warning and Earth observation.

We are currently seeking an Early Career Spacecraft Thermal Engineer to join our team in El Segundo, California.

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
• Support thermal verification testing on spacecraft systems and components including test design, test conduct, data reduction, analysis, and reporting
• Assist in proposal and business development efforts

Requirements

• Bachelor of Science degree in Engineering (with a focus on Mechanical, Civil, Aerospace Aeronautical, or Material Sciences)
• 1 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
• 1 or more years of experience with thermal analysis tools (e.g., Thermal Desktop, SINDA/FLUINT, Thermica)
• Ability to obtain a US Security Clearance for which the US Government requires US Citizenship. A final U.S. clearance Post Start is required

We Offer

• Competitive base pay and variable compensation opportunities
• Generous company match to your 401(k)
• Industry-leading tuition assistance program
• Fertility, adoption, and surrogacy benefits
• Up to $10,000 gift match for supporting nonprofit organizations

About the Company

At Millennium Space Systems, we innovate and collaborate to make the world a better place. We’re committed to fostering an environment for every teammate that’s welcoming, respectful, and inclusive, with great opportunity for professional growth.

Application Details

• Job ID: JR2026503921
• Category: Engineering
• Role Type: Onsite
• Post Date: Sep. 17, 2026
• Application Deadline: Oct. 02, 2026

Total Rewards

At Millennium Space Systems, 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.

Summary pay range:

• Level 1: $63,000 - $113,000
• Level 2: $75,000 - $134,000

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.

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.