Sr. Principal Software Engineer

Job ID: 01876227Posted: Posted TodayStart Date: 2026-09-21Location: US-NH-PELHAM-PE1 ~ 50 Bush Hill Rd ~ BLDG 1Country: United States of AmericaTime Type: Full timeDate Posted:2026-09-21 Country:United States of America Location:US-NH-PELHAM-PE1 ~ 50 Bush Hill Rd ~ BLDG 1 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 dateAt 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.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 Missile Defense Sensors (MDS) software department within Raytheon is looking for a Senior Principal Software Engineer to join the National Advanced Surface-to-air Missile (NASAMS) program. The department’s mission is to provide world class Missile Defense and Surveillance Radar Software to be used in radar and effector systems deployed on land and sea. Our software teams employ an Agile Scrum and DevSecOps processes to rapidly design, code, and integrate capabilities on a continuous basis into a mature solution for our customers. What You Will DoWork with external partners to design interfaces across distinct products.Interpret requirements, design, code, test and integrate new features in C.Lab configuration and maintenance including maintaining configurations, monitoring status and updating software.Attend Software Review Boards (SRBs) and Change Control Boards (CCBs).Perform analysis of data received from systems and/or test events.Support the execution of all new business development activities.Collaborate with systems engineers, integration and test engineers, and other stakeholders to define system requirements and ensure seamless integration of software components. Represent the software team in program-level discussions, providing technical expertise and ensuring alignment with program objectives. Qualifications You Must HaveTypically requires a Bachelor’s Degree in Science, Technology, Engineering or Mathematics (STEM) field and 10 years of relevant experience. An advanced degree may count for additional years of experience. Experience with C and/or C++. Experience with understanding of Linux, VxWorks and/or other Real-Time Operating Systems.Experience with development of real-time, multi-threaded applications.Experience with User Interface/User Experience (UI/UX) design.Active and transferable U.S. government-issued Secret security clearance is required prior to start date. U.S. citizenship is required, as only U.S. citizens are eligible for a security clearance.Qualifications We PreferExperience with system-level integration and test.Experience with VxWorks Workbench and/or Tornado.Experience with Clearcase and/or Git.Experience with makefiles and make environments.Experience with Windows application development.Experience with DOORS or other Requirements Tracking Systems.Experience with writing scripts and utilizing Matlab for testing.Experience with UDP/IP and TCP/IP networking protocols.Prior NASAMS experience.Experience interfacing with external partners and lead technical solutions with complex user requirements. Experience with subcontract and/or partner management.Experience with cost estimation and developing government technical proposals. Experience with Software Development in a DoD environment. Experience working well independently with little oversight.Experience driving creative solutions to complex technical problems in a fast-paced environment.Learn More & Apply NowPlease 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.Hybrid: Employees who are working in Hybrid roles will work regularly both onsite and offsite. Ratio of time working onsite will be determined in partnership with your leader.Remote: Employees who are working in Remote roles will work primarily offsite (from home). If you live within a reasonable commute of an RTX site with other colleagues you interact with, your manager will discuss whether there is a degree of onsite presence associated with this role.Candidates will learn more about role type and current site status throughout the recruiting process. For onsite and hybrid roles, commuting to and from the assigned site is the employee’s personal responsibility.Requires expert or mastery level knowledge of work area, typically obtained through advanced education combined with experience.May have deep knowledge of project management. Advanced knowledge of related disciplines within work area and ability to identify links and potential impact on projects, programs or systems.Typically requires: A University Degree or equivalent experience and minimum 10 years prior relevant experience, or An Advanced Degree in a related field and minimum 7 years experience Engineering/Other Technical Positions: Typically requires a degree in Science, Technology, Engineering or Mathematics (STEM) and a minimum of 10 years of prior relevant experience unless prohibited by local laws/regulations.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 132,400 USD - 251,600 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