Principal Software Engineer (Onsite)

Company: RTX
Location: Huntsville
Posted on: April 1, 2026

Job Description:

Date Posted: 2026-03-23 Country: United States of America Location: US-AL-HUNTSVILLE-401 ~ 401 Jan Davis Dr NW ~ JAN DAVIS 401 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 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. As a Principal Software Engineer, you will support one or more phases of the System Development Life Cycle (SDLC) - requirements, design, development (using C and C++), test, validation, and maintenance. This is an onsite role based in Huntsville, AL. What You Will Do Collaborate with cross-functional, agile teams to define, design, and implement new features, ensuring system integration and scalability. Troubleshoot, debug, and optimize existing code for performance and efficiency in complex environments. Write and maintain comprehensive documentation for software applications, including system architecture and design specifications. Participate in product reviews and ensure adherence to engineering standards and best practices. Stay current with industry trends and advancements in modern languages, Artificial Intelligence (AI), DevSecOps, and other methodologies and technologies, especially in relation to complex systems. Exhibit leadership behaviors and practices and serve (part-time or full-time) in leadership roles Travel and off hours testing (2nd or 3rd shift) may occasionally be required. What You Will Learn Agile methodology and the associated tools. Leadership tools associated with Proposal efforts and Earned Value (EV) Modern DevSecOps and Continuous Integration/Continuous Delivery techniques. Test-Driven Multi-Disciplined Capability (TDMC) Product Development methodology. A variety of domains such as battle management, command & control, communications, radar, missile, and/or modeling & simulation Work across engineering disciplines to develop solutions to complex problems in support of defense systems. Use AI to increase efficiency, resulting in higher quality products, across the SDLC. Qualifications You Must Have Typically requires a minimum of a bachelor’s in Science, Technology, Engineering, or Mathematics (STEM) and a minimum of 8 years of experience. Experience in leading a small team (e.g., estimating effort, decomposing tasks, tracking and reporting progress). Experience in developing complex systems and applications using an object-oriented (OO) programming language (in particular, C++). Experience in a Unix/Linux operating system. Experience with data structures, software design principles, and coding algorithms, particularly in high-concurrency and distributed systems. Experience in embedded systems, real-time systems, or large-scale applications. Experience with multithreading, memory management, and performance optimization in complex environments. Experience with Shell Scripting (tcsh, csh, bash), software development tools like Git/Clearcase, and software debuggers Experience with software development methodologies (Agile, Scrum, etc.). The ability to obtain and maintain a U.S. government issued interim secret security clearance is required prior to start. U.S. citizenship is required, as only U.S. citizens are eligible for a security clearance. Qualifications We Prefer Active Secret security clearance. Experience in the role as a Scrum Master (SM) and/or a Product Owner (PO). Experience with Network Communication Protocols and using embedded Real-Time Operating Systems (RTOS), such as VxWorks and Integrity. Experience in OO languages such as Java, C#, and Ada. Competency with Red Hat Enterprise Linux Operating System. 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. Learn More and Apply Now! 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: https://www.state.gov/m/ds/clearances/c10978.htm 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. Huntsville, AL: https://careers.rtx.com/global/en/raytheon-huntsville,-al-location 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: RTX, Franklin , Principal Software Engineer (Onsite), IT / Software / Systems , Huntsville, Tennessee