Principal Cryogenics Engineer

Prattwhitney; Tucson (AZ); On-site; USD 108,000 - 205,000; Full time

Benefits offered by this job

Relocation assistance

Medical

Dental

Vision

Life Insurance

Disability (short-term)

Disability (long-term)

401(k) match

Flexible Spending Accounts

Flexible work schedules

Employee Scholar Program

Parental leave

Paid time off

Holidays

Job summary

RTX is seeking a Principal Cryogenics Systems Design Engineer in Tucson, AZ to design and analyze cryogenic systems for infrared sensor programs. You will work with multi-discipline teams in a fast-paced defense environment on high-pressure gas supplies, coolers, and Dewar designs.

Minimum 8 years in STEM, with thermodynamics, heat transfer, and CREO proficiency. Onsite work with potential travel to government facilities; DoD clearance required.

Qualifications

• Requires STEM degree and 8+ years of experience.
• Experience in thermodynamic and heat transfer analysis is needed.
• Familiarity with cryogenic system design preferred.

Responsibilities

• Design and analyze high-pressure gas supply assemblies and cryogenic coolers.
• Troubleshoot cryogenic systems and support suppliers.
• Prepare technical justification reports for programs.
• Travel to government/partner facilities as needed.

Skills

Cryogenic design

Thermodynamic analysis

Heat transfer analysis

Pro/Engineer/CREO

Dewar design

Education

STEM degree

Tools

Creo/ProE

Job description

Date Posted: 2026-08-14 Country: United States of America Location: US-AZ-TUCSON-9070 ~ 9070 S Rita Rd ~ 9070 BLDG Position Role Type: Onsite U.S. Citizen, U.S. Person, or Immigration Status Requirements: Active and transferable U.S. government issued security clearance is required prior to start date. U.S. citizenship is required, as only U.S. citizens are eligible for a security clearance Security Clearance Type: DoD Clearance: Secret Security Clearance Status: Ability to obtain INTERIM U.S. government issued security clearance is required prior to start date

At RTX, the world's largest aerospace and defense company, 185,000 great minds are united by purpose and inspired to make a difference solving the world’s most complex problems. With our three market leading businesses, world-class operations and investments in research and development, we offer capabilities and opportunity no one else can. Together, we push the boundaries of known science and find new ways to connect and protect our world. Raytheon brings the strength of more than 100 years of experience and renowned engineering expertise to meet the needs of today’s mission and stay ahead of tomorrow’s threat. We deliver solutions that help our nation and allies defend freedom and deter aggression, creating a safer, more secure world. Join us and help shape the future of aerospace and defense.

The Effector-Optics (EO) Department is currently seeking a Principal Cryogenics Systems Design Engineer with design and analysis skills, experience in cryogenics systems, component fabrication, and testing. You will work with multi-discipline teams supporting military programs in the development and production phases of infrared sensor systems.

This is an onsite position located in our Tucson, AZ campus.

What You Will Do

• 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.
• Work closely with components suppliers.
• Prepare technical justification analysis reports.
• Occasional travel to government and other facilities in support of program activities.

Qualifications

• You Must Have: Typically requires a 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, cryogenics systems design, analysis, or fabrication.
• We Prefer: Cryogenics System Design familiarity.
• Experience with thermodynamic and heat transfer analysis and structural analysis.
• Working knowledge of Pro/Engineer, CREO.
• Mechanical aptitude to provide solutions to a variety of technical problems of moderate scope and complexity.

What We Offer

Our values drive our actions, behaviors, and performance with a vision for a safer, more connected world. At RTX we value: Safety, Trust, Respect, Accountability, Collaboration, and Innovation.

• Relocation assistance available!
• medical
• dental
• vision
• life insurance
• short-term disability
• long-term disability
• 401(k) match
• flexible spending accounts
• flexible work schedules
• employee assistance program
• Employee Scholar Program
• parental leave
• paid time off
• holidays

Please consider the following role type definition as you apply for this role. Onsite: Employees who are working in Onsite roles will work primarily onsite. This includes all production and maintenance employees, as they are essential to the development of our products. This position requires onsite work in Tucson, AZ: https://careers.rtx.com/global/en/raytheon-tucson,-az-location This position requires security clearance. DCSA Consolidated Adjudication Services (DCSA CAS), an agency of the Department of Defense, handles and adjudicates the security clearance process. More information about Security Clearances can be found on the US Department of State government website here: https://www.state.gov/m/ds/clearances/c10978.htm #LI-TR1 As part of our commitment to maintaining a secure hiring process, candidates may be asked to attend select steps of the interview process in-person at one of our office locations, regardless of whether the role is designated as on-site, hybrid or remote.

The salary range for this role is 107,500 USD - 204,500 USD. The salary range provided is a good faith estimate representative of all experience levels. RTX considers several factors when extending an offer, including but not limited to, the role, function and associated responsibilities, a candidate’s work experience, location, education/training, and key skills. Hired applicants may be eligible for benefits, including but not limited to, medical, dental, vision, life insurance, short-term disability, long-term disability, 401(k) match, flexible spending accounts, flexible work schedules, employee assistance program, Employee Scholar Program, parental leave, paid time off, and holidays. Specific benefits are dependent upon the specific business unit as well as whether or not the position is covered by a collective-bargaining agreement. Hired applicants may be eligible for annual short-term and/or long-term incentive compensation programs depending on the level of the position and whether or not it is covered by a collective-bargaining agreement. Payments under these annual programs are not guaranteed and are dependent upon a variety of factors including, but not limited to, individual performance, business unit performance, and/or the company’s performance. This role is a U.S.-based role. If the successful candidate resides in a U.S. territory, the appropriate pay structure and benefits will apply. RTX anticipates the application window closing approximately 40 days from the date the notice was posted. However, factors such as candidate flow and business necessity may require RTX to shorten or extend the application window.

RTX is an Equal Opportunity Employer.

All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, age, disability or veteran status, or any other applicable state or federal protected class.

RTX provides affirmative action in employment for qualified Individuals with a Disability and Protected Veterans in compliance with Section 503 of the Rehabilitation Act and the Vietnam Era Veterans’ Readjustment Assistance Act.

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RTX is an aerospace and defense company that provides advanced systems and services for commercial, military and government customers worldwide. It comprises three industry-leading businesses – Collins Aerospace, Pratt & Whitney, and Raytheon. Its 195,000 employees enable the company to operate at the edge of known science as they imagine and deliver solutions that push the boundaries in quantum physics, electric propulsion, directed energy, hypersonics, avionics and cybersecurity. The company, formed in 2020 through the combination of Raytheon Company and the United Technologies Corporation aerospace businesses, is headquartered in Arlington, Virginia.