Principal Software Engineer (Mission Systems) (Onsite)

Date Posted: 2026-06-22 Country: United States of America Location: US-TX-MCKINNEY-513WD ~ 2501 W University Dr ~ WING D BLDG 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 freedoms and deter aggression, creating a safer, more secure world. Join us and help shape the future of aerospace and defense. The Sensors: Space and Airborne Radar Center provides end-to-end design, development, deployment, integration, and sustainment of multi-domain C2 and radar systems. The center specializes in developing Tactical Modes, Built-In Test (BIT), and Radar Interface software for Tactical Radar Systems, as well as pioneering radar software and signal processing technologies. The center also develops advanced sensor technologies and mission support capabilities for warfighters, including electro-optical, infrared, and electronic solutions across various platforms. Our software engineers are responsible for software architecture, design, and implementation for radar systems, signal processing, tracking, and resource management throughout the product lifecycle. Raytheon has an opportunity for a Principal Software Engineer to join our Mission Systems Engineering Team in the DFW area. We’re seeking a highly capable Software Engineer with strong systems thinking, deep software architecture experience, and domain knowledge in advanced defense or aerospace systems. This role is ideal for someone who thrives in a fast‑paced environment, collaborates across disciplines, and can drive software design at the system-of-systems level. What You Will Do This position is for a Principal Software Engineer who has professional experience in the development and implementation of software for real-time applications. Deliverables include but not limited to: Function as a senior technical contributor who can delegate and review work from lower level engineers and influence policies, practices, and procedures to ensure steady progress. Provide senior level systems thinking and architecture support (systems CONOPS, specification trees, and multi CSCI decomposition) to resolve complex issues on the path to PDR. Operate effectively with senior architects and technical fellows, integrating across disciplines and navigating a fast moving environment with minimal oversight. Leverage subject matter expertise in system of systems architecture, inter CSCI interfaces, software requirements, and SW/HW integration to drive technical clarity across a broad array of potential sensor and effector integrations. Utilize advanced modeling tools (Cameo/EA), MOSA standards, and multi discipline agile leadership experience to communicate technical decisions across engineering teams, customers, and vendors, and to support major design reviews. Architect, implement, test, and debug embedded real‑time software in heterogeneous hardware, firmware, and software environments. Participate in major design reviews, including PDR and CDR. Mentor less experienced engineers. Occasional business travel may be required, up to 5%. Onsite role in McKinney, Texas, with local residency or relocation required. Qualifications You Must Have Typically requires a degree in Science, Technology, Engineering, or Mathematics (STEM) and a minimum of 8 years of prior relevant engineering experience. Experience with software architecture for large scale and complex system‑of‑systems, subsystem interface design, and software integration and test. Experience with engineering and modeling tools (Cameo or Enterprise Architect, MS Visio) and familiarity with MOSA standards (OMS, AMS‑GRA, A-GRA). Experience developing, testing, and integrating real-time software applications using C++ or related software languages and Linux, VxWorks, or other real-time operating systems. Product-domain experience in at least one of the following areas: RF or EO/IR Sensors Electronic Warfare Effectors Communications Multi-domain Mission Systems 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. Qualifications We Prefer Demonstrated collaboration with other engineering teams - Systems, Firmware, and Hardware. Ability to develop and present complex technical material at design reviews such as PDR and CDR. Ability to work effectively in fast-paced, dynamically changing environments. Proactive problem-solving and strong ownership mindset. Experience working in system integration lab (SIL) environments with physical hardware including test benches and simulators. Experience with Agile Scrum development practices. Hands-on experience with Git for version control and GitLab or Artifactory for repository management. Familiarity with DevSecOps pipelines including static analysis, automated build and test, CI/CD, and test-driven development. Active and transferable U.S. government issued Secret security clearance with special program access. 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 offered based on eligibility Learn More & Apply Now! Please ensure the role type defined below is appropriate for your needs before applying to this role. This position is classified as: 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. Clearance Information: This position requires a 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: Location Information: This position is onsite at our campus in beautiful McKinney, TX or El Plano, TX . We Are RTX 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