Principal Mechanical Engineer - Cooling Systems

Company: Raytheon
Location: Marlborough
Posted on: April 6, 2026

Job Description:

Date Posted: 2026-02-23 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 Raytheon, the foundation of everything we do is rooted in our values and a higher calling – to help our nation and allies defend freedoms and deter aggression. We bring 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. Our team solves tough, meaningful problems that create a safer, more secure world. 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. This role is for a Principal Cooling Systems Engineer to 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 is in Marlborough, MA. (On-site) What You Will Do - Working collaboratively with our customers to establish cooling systems requirements - Mechanical design, analysis, and documentation of cooling hardware and systems - 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 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 or An Advanced Degree in a related field and minimum 5 years’ experience. - Experience in the fields of Thermodynamics, Fluid Mechanics, and/or Heat Transfer - Minimum 8 years of 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 - The ability to obtain and maintain a US security clearance. U.S. citizenship is required as only U.S. citizens are eligible for a security clearance Qualifications We Prefer - Master’s Degree in STEM - Willingness for international travel to Middle East, Asia, and Europe to foreign sites, suppliers, and facilities. - 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 - 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 Eligibility Learn More & Apply Now! - 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. 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. Privacy Policy and Terms: Click on this link to read the Policy and Terms

Keywords: Raytheon, Somerville , Principal Mechanical Engineer - Cooling Systems, Engineering , Marlborough, Massachusetts