Senior Mechanical Cooling Engineer

Date Posted: 2026-09-11

Country: United States of America

Location: US-MA-MARLBOROUGH-MA1 ~ 1001 Boston Post Rd ~ BLDG 1

Position Role Type: Onsite

U.S. Citizen, U.S. Person, or Immigration Status Requirements: The ability to obtain and maintain a U.S. government issued security clearance is required. 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: Active and existing security clearance required after day 1

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 Raytheon Hardware Engineering (HWE) Organization leads the mechanical-electrical hardware design, development and production of critical defense systems. The HWE Team uses state-of-the-art tools, processes, technology, and Raytheon’s CORE principles. HWE’s capabilities encompass a broad range of technical disciplines which include engineering, manufacturing, technical services, materials, processes, analysis, test, and documentation. The Radar Mechanical Design Department leads mechanical design, development, and integration of some of the most innovative land-based and shipboard radars in the world. This includes phased array radar systems, electronic modules, pedestals, and power and liquid cooling systems. The department comprises individuals with technical expertise and experience in all phases of hardware design, integration, and production support.

The Senior Cooling Systems Engineer will support cooling and hydraulic systems used in a variety of harsh environmental military applications. Our primary role is to design and support the fabrication, testing, and installation of custom liquid-cooled systems for radars. We also support custom air-cooling of power and communication shelters.

This position onsite either in our Marlborough, MA or Andover, MA location.

What You Will Do

• Working collaboratively with our customers to establish cooling systems requirements
• Mechanical design, analysis, and documentation of cooling hardware and system
• Selection of components including pumps and heat exchangers
• Drawing generation, drawing release, and drawing change incorporation
• Resolution of change requests from manufacturing or suppliers
• Provide technical conscience, challenged with making sure the product and process meet appropriate standards and requirements.
• Factory and supplier support of product integration domestically and internationally
• Willingness to travel to domestic Raytheon sites, suppliers, and government facilities.
• Willingness for international travel to Middle East, Asia, and Europe to foreign sites, suppliers, and facilities.

Qualifications You Must Have

• Typically requires a degree in Science, Technology, Engineering, and Mathematics (STEM) and a minimum of 5 years of relevant prior experience or an advanced degree in a related field and minimum 3 years’ experience.
• Experience in the fields of Thermodynamics, Fluid Mechanics, and/or Heat Transfer.
• Engineering project experience involving cooling systems – liquid cooling or air cooling.
• Experience in solid modeling tools such as Pro/Engineer, Solidworks, AutoCAD, Autodesk Inventor, or similar tool.

Qualifications We Prefer

• An advanced degree in Science, Technology, Engineering, and Mathematics (STEM).
• Experienced in the application of ANSI 14.5M – 1994 (1982), Geometric Dimension & Tolerance.
• Proficiency in Product Data Management (PDM) or equivalent configuration/data management software
• Collaborate with other engineering disciplines, non-technical disciplines, and suppliers to resolve technical issues.
• Experience with Microsoft Office applications including MS Word, Excel, and PowerPoint

What We Offer

• A total rewards package that goes above and beyond with compensation; healthcare, wellness, and work/life benefits; career development and recognition programs. Some of the benefits we offer include parental (including paternal) leave, flexible work schedules, achievement awards, educational assistance and child/adult backup care.
• Our values drive our actions, behaviors, and performance with a vision for a safer, more connected world. At RTX we value: Trust, Respect, Accountability, Collaboration, Innovation, and Safety.
• Relocation assistance available.

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 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:

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 86,800 USD - 165,200 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.