Thermal Engineer (Senior)

Responsibilities

• Develop and maintain spacecraft-level thermal models using Ansys Thermal Desktop
• Evaluate and validate thermal analysis results to ensure accuracy and alignment with mission requirements
• Drive innovation by identifying ways to reduce cost and complexity of legacy thermal subsystems
• Plan and execute thermal subsystem milestone reviews (e.g., SRR, PDR, CDR, MRR)
• Oversee thermal flight hardware integration and ensure quality control during build and test
• Design, plan, and execute thermal vacuum tests at both component and system levels
• Correlate test and flight data to thermal models to refine accuracy and performance predictions
• Collaborate cross-functionally with mechanical, systems, and avionics teams

Requirements

• U.S. Persons status required
• Bachelor’s degree in Mechanical Engineering, Aerospace Engineering, or a related field
• 5+ years of experience in thermal engineering, preferably in spacecraft or aerospace systems
• Proficiency with Ansys Thermal Desktop
• Strong understanding of spacecraft thermal control systems
• Familiarity with thermal margin definitions per MIL-STD, Aerospace TOR, or vendor command media
• Proficiency with Siemens NX and Teamcenter
• Experience with thermal vacuum testing, thermal test instrumentation, and data acquisition systems
• Working knowledge of 2-phase thermal control systems
• Strong analytical, problem-solving, and communication skills

Benefits

• Equity in Apex
• 100% company-paid medical, dental, and vision for employees and dependents
• $100k life insurance at no cost
• Comprehensive PTO package starting at 15 days vacation
• 10 paid holidays
• 401(k) plan with generous matching
• 8 weeks paid parental leave and childcare reimbursement
• Daily catered lunch and unlimited snacks

About the Company

Apex manufactures satellite buses at scale using a combination of software, vertical integration, and hardware designed for manufacturing to provide humankind access to the galaxy.