Principal Cryogenics Engineer

Date posted: 2026-08-14 • Location: Tucson, AZ • Onsite role • Active and transferable U.S. government-issued Secret security clearance required prior to start; U.S. citizenship is required.

About the role

RTX, the world’s largest aerospace and defense company, is seeking a Principal Cryogenics Systems Design Engineer to join the Effector-Optics (EO) Department. You will work with multi-discipline teams supporting military programs in the development and production phases of infrared sensor systems at our Tucson, AZ campus.

Responsibilities

• Design and analysis of high-pressure gas supply assemblies, Joule-Thompson coolers, Stirling coolers, Dewar design, Ultra High Vacuum (UHV) hermetic vessels, and sealing techniques.
• Troubleshoot EO cryogenic systems.
• Collaborate closely with components suppliers.
• Prepare technical justification analysis reports.
• Occasional travel to government and other facilities in support of program activities.

Requirements

• Degree in Science, Technology, Engineering, or Mathematics (STEM) and a minimum of 8 years of prior relevant experience.
• Experience in thermodynamic, heat transfer analysis, and structural analysis.
• Experience with Pro/Engineer and/or CREO.
• Experience with fluid, pneumatic, vacuum, or cryogenics systems design, analysis, or fabrication.

Preferred Qualifications

• Familiarity with cryogenics system design.
• Working knowledge of Pro/Engineer and CREO.
• Mechanical aptitude to provide solutions to technical problems of moderate scope and complexity.

Benefits

• Medical, dental, and vision insurance.
• Life insurance, short-term disability, and long-term disability.
• 401(k) match.
• Flexible spending accounts.
• Flexible work schedules.
• Employee assistance program.
• Employee Scholar Program (tuition assistance).
• Parental leave.
• Paid time off and holidays.
• Annual short-term and/or long-term incentive compensation programs (eligibility dependent on role level and collective-bargaining agreement).
• Relocation assistance available.

Pay

The salary range for this role is $107,500 – $204,500 USD. The range provided is a good-faith estimate representative of all experience levels. RTX considers several factors when extending an offer, including role, function, responsibilities, work experience, location, education/training, and key skills.