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Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Sr. Principal Software Engineer - **Company:** RTX - **Location:** Pelham, NH, United States (Remote available) - **Experience:** Expert - **Salary:** $132,400.0 - $251,600.0 - **Contract:** Permanent contract - **Skills:** Microsoft Windows, Data Analysis, Systems Engineering, C++ (Programming Language), IBM Rational ClearCase, Linux, Make (Software), Design of User Interfaces, Human-Computer Interaction, MATLAB, Scrum Methodology, Real-Time Operating Systems, Software Engineering, Software Requirements Analysis, Systems Integration, Software Technical Review, User Datagram Protocols, VxWorks, Multithreading, Scripting, Git, Devsecops - **Published:** September 23, 2026 - **Apply:** https://www.careerjet.com/job/us53b42382fa66abf8519e1ae79efbd0df/eaa ## About the Role Security Clearance Status: Ability to obtain INTERIM U.S. government issued security clearance is required prior to start date, Typically 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 Prefer Experience 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., 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. ## Description 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 Do Work 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., 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. 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. ## Related Videos - [Why Your Best Mediors Never Become Seniors (And How to Fix It)](https://www.wearedevelopers.com/videos/2108-why-your-best-mediors-never-become-seniors-and-how-to-fix-it) - [Leveraging Large Language Models for Legacy Code Translation: Challenges and Solutions](https://www.wearedevelopers.com/videos/1157-leveraging-large-language-models-for-legacy-code-translation-challenges-and-solutions) - [Docker network without Docker](https://www.wearedevelopers.com/videos/1418-docker-network-without-docker) - [How a Small Team Shrank a Microsoft Monorepo by 94%](https://www.wearedevelopers.com/videos/1236-how-a-small-team-shrank-a-microsoft-monorepo-by-94) - [Building a hypercar from scratch](https://www.wearedevelopers.com/videos/607-building-a-hypercar-from-scratch) - [Docker exec without Docker](https://www.wearedevelopers.com/videos/1094-docker-exec-without-docker) ## Related Articles - [Fully Remote Software Engineer Jobs](https://www.wearedevelopers.com/magazine/447-fully-remote-software-engineer-jobs) - [Is Software Engineering Over-Saturated?](https://www.wearedevelopers.com/magazine/418-is-software-engineering-over-saturated) - [What’s the Difference between a Junior, Mid, and Senior Developer?](https://www.wearedevelopers.com/magazine/238-what-s-the-difference-between-a-junior-mid-and-senior-developer) - [Highest Paying Tech Companies for Developers](https://www.wearedevelopers.com/magazine/220-highest-paying-tech-companies-for-developers) - [How Much Does a Software Engineer Make? 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