Mechanical Engineer, Thermal Design

Until 9/15/2026 5+ years exp First posted July 17, 2026 Last posted July 17, 2026
Job description
General Atomics Electromagnetic Systems (GA-EMS) designs and manufactures first-of-a-kind electromagnetic and electric power generation systems. GA-EMS’ expanding portfolio of specialized products and integrated system solutions support critical fleet, space systems and satellites, missile defense, power and energy, and process and monitoring applications for defense, industrial, and commercial customers worldwide.

We have an exciting opportunity in Acton, MA for a Mechanical Engineer with a focus on thermal design for optical space payloads. The ideal candidate has a strong background in heat transfer and thermal engineering and their application to space systems, direct experience in the thermal design and analysis of spacecraft or space payloads, and hands-on experience with the assembly, integration, and test (AI&T) of hardware. This role is suited for an engineer with approximately 5–7 years of experience who can operate independently and take technical ownership of portions of payload and spacecraft thermal subsystems.

The successful applicant will work as part of a multi-disciplinary team to develop, analyze, and test thermal control solutions for optical payloads and satellite systems. You will collaborate with mechanical, systems, optical, electrical, manufacturing, and test engineers, lead key thermal tasks, and help drive best practices for thermal control of space systems across the program.

DUTIES & RESPONSIBILITIES
  • Lead the design and development of thermal management solutions for optical space payloads, payload components, payload subassemblies, and orbital satellite systems.
  • Plan and perform thermal analysis, modeling, and simulation (e.g., using SINDA/FLUINT and Thermal Desktop) to support design trades, requirements verification, and performance assessments.
  • Lead elements of the assembly, integration, and test (AI&T) process for payload thermal hardware, including procedure development, test setup definition, execution oversight, and data analysis.
  • Own the development and review of thermal subsystem requirements, allocations, design documentation, integration plans, and test procedures, and ensure traceability to system-level requirements.
  • Plan and execute environmental test campaigns (e.g., thermal vacuum, thermal cycling), including test planning, test readiness and execution, and correlation of models to test results.
  • Prepare technical documentation, including analysis reports, design review materials, and test reports, for internal meetings and program milestone reviews.  Present relevant materials to sponsors and other external organizations.
  • Identify, troubleshoot, and resolve design, workmanship, and performance issues related to space vehicle and payload thermal control subsystems.
  • Maintain the strict confidentiality of sensitive information.
We recognize and appreciate the value and contributions of individuals with diverse backgrounds and experiences and welcome all qualified individuals to apply.
About this role

Summary

Design, analyze, and test thermal systems for optical space payloads and satellite systems.

Job title

Mechanical Engineer, Thermal Design

Experience level

5-7 years

Minimum experience

5+ years exp

Industry

defense

Location requirements

On-site in Acton, MA; remote not specified.

Salary

Not specified

Management role

No

Skills & keywords

Required skills

heat transferthermal analysisSINDA/FLUINTThermal DesktopAI&T

Preferred skills

space payloadsthermal vacuum testingthermal modelingthermal control

Specializations

thermal managementspace systemsthermal analysisthermal testing
Locations

Structured locations inferred from the posting.

Acton, MA, USA

On-site City