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Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Senior Principal Software Engineer - Advanced System Tools (Onsite) - **Company:** RTX - **Location:** Cedar Rapids, IA, United States - **Experience:** Expert - **Salary:** $132,400 - $251,600 - **Contract:** Permanent contract - **Skills:** Artificial Intelligence, Amazon Web Services, JIRA, Automation of Tests, C++ (Programming Language), Cloud Computing, System Configuration, Middleware, Object-Oriented Software Development, Software Engineering, Software Requirements Analysis, Software Systems, Subversion, Systems Architecture, Test Case, VxWorks, Safety Critical Systems, Git, C++14, Software Version Control - **Published:** November 13, 2026 - **Apply:** https://globalhr.wd5.myworkdayjobs.com/REC_RTX_Ext_Gateway/job/US-IA-CEDAR-RAPIDS-124--400-Collins-Rd-NE--BLDG-124/Senior-Principal-Software-Engineer---Advanced-System-Tools--Onsite-_01889374 ## About the Role * Typically requires a degree in Science, Technology, Engineering or Mathematics (STEM) and minimum 10 years prior relevant experience or an Advanced Degree in a related field and minimum 7 years of experience. * Experience designing and developing software architecture, libraries, or platform-level components. * Experience leading technical execution of projects, including customer engagement and presenting to senior stakeholders., * Hands-on experience supporting DO-178 software development and certification activities (e.g., requirements, verification, or certification artifacts). * Experience working across cross-functional engineering and program teams to deliver complex, integrated solutions. * Experience with C++ and VxWorks. * Experience with Cloud Based development environments (such as AWS). * Experience with AI based tools & development practices. * Experience writing High-Level and Low-Level Requirements. * Experience writing Test Cases and Automated Test Procedures. * Experience with Civil Certification DO-178 - DAL A. * Experience with design and development of Avionics Tools, Aircraft Applications or Middleware. * Familiar with revision control concepts and tools (e.g. GIT, Subversion, JIRA). ## Description We are seeking a Software Engineer II who thrives on solving complex technical challenges and driving high-impact solutions across safety-critical systems. We have opportunities in one of our two departments: * Core Services & Libraries, dedicated to creating versatile frameworks that enable highly adaptable and portable software solutions, agnostic of hardware or software configurations. * Advanced Systems Tools, driving a development eco-system (development kits, virtual rigs, and test rigs) enabling the development, integration, verification, and configuration of avionic products and platforms. In this role, you will lead the architecture and development of core software components, libraries, rigs and tools that enable scalable, certifiable avionics platforms. You'll work across the full software lifecycle, partnering with cross-functional teams to deliver high-quality solutions aligned with civil and military certification standards. This is a unique opportunity to influence system-level design, advance open architecture initiatives, and contribute to technologies that define the future of aerospace. What You Will Do: * Lead the architecture and design of core software components, libraries, and tooling aligned to avionics system requirements * Lead technical direction and execution across development and verification activities for safety-critical software (DO-178, DO-254, and/or DO-330) * Develop and manage software requirements, ensuring proper decomposition and traceability across complex systems of systems * Develop and verify software using modern C++ and object-oriented design principles * Own and produce certification artifacts, including DAL-A deliverables * Lead and support certification efforts, including engagement with customers and regulatory authorities * Conduct and contribute to peer reviews to ensure quality, consistency, and compliance across the lifecycle * Collaborate cross-functionally with engineering, program leadership, and customers to align technical solutions with program objectives * Willing and Able to travel as required (domestic and international <10%). What You Will Learn: * Gain hands-on experience with cutting-edge and emerging technologies that are shaping the future of avionics and aerospace systems. * Build end-to-end expertise across the full product lifecycle, from requirements and design through verification and delivery of safety-critical systems. * Develop a deep understanding of civil certification (DO-178, DO-254, and/or DO-330) and how world-class avionics products meet rigorous regulatory standards. * Learn how to design, scale, and sustain software product lines that support a wide range of platforms and global customers.