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Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Senior Principal Software Architect (Onsite) - **Company:** RTX - **Location:** Richardson, TX, United States - **Experience:** Expert - **Salary:** $132,400.0 - $251,600.0 - **Contract:** Permanent contract - **Skills:** Agile Methodology, Application Frameworks, JIRA, Automation of Tests, C++ (Programming Language), CMake, Configuration Management, Software Debugging, Programming Tools, Memory Management, Embedded Software, Network Interface Controllers, Hardware Interface Design, Hardware-In-The-Loop Simulation, Industry Standard Architecture, JSON, Python (Programming Language), Microsoft Visual Studio, Performance Tuning, Qt Modeling Language (QML), Qt (Software), Real-Time Operating Systems, Secure Coding, Software Engineering, Software Requirements Analysis, Software Systems, Systems Integration, UML, Multithreading, Real Time Systems, Code Structure, Git - **Published:** August 7, 2026 - **Apply:** https://globalhr.wd5.myworkdayjobs.com/REC_RTX_Ext_Gateway/job/US-TX-RICHARDSON-461--3200-E-Renner-Rd--RENNER-BLDG-461/Senior-Principal-Software-Architect--Onsite-_01864021 ## About the Role 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, * Extensive experience with real-time operating systems (RTOS), including development, debugging, and performance optimization of embedded software applications * Experience with Model-Based Systems Engineering (MBSE), system decomposition, and interface control across disciplines * Experience with software lifecycle processes, configuration control, and change management in high-integrity development environments * Active and transferable Secret U.S. government issued security clearance is required prior to start date * 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 with multithreading, memory management, and performance optimization in complex environments * Experience in secure coding practices * Experience with hardware-software integration and hardware-in-the-loop (HIL) testing * Experience with development tool sets, including Jira, Git, Visual Studio Code, cmake * Experience with Qt framework and development tools to generate C++ and QML code * Ability to read electrical schematics and understand system-level hardware interfaces * Expertise in Programmable Logic Controllers (PLCs) that support C++-based application frameworks ## Description * Work collaboratively both within the software team, as well as with systems and hardware engineers to design and develop our solution to control and monitor mission critical VLF transmitters * Define, evolve, and optimize software and simulation design across mission-critical embedded platforms * Serve as technical lead for cross-functional development, driving software solutions to systems and hardware engineers while ensuring development team understands platform and hardware constraints * Mentor and guide engineering teams in architectural best practices, modularity, code structure, and performance tradeoffs in real-time systems * Identify areas for optimization and collaborate on architecture-level decisions along with other software Subject Matter Experts (SMEs) to meet system constraints * Define software requirements and Unified Modeling Language (UML) design diagrams within a Model Based Systems Engineering (MBSE) tool * Develop and integrate multi-threaded embedded software using C and C++ within a Real Time Operating System (RTOS) * Support integration and verification within our automated test framework (gtest, python, JSON) * Enhance simulation elements to reflect new hardware capabilities * Drive technical design and software development practices to meet stringent Security Technical Implementation Guides (STIGs) * Support document updates to meet customer Contract Data Requirements List (CDRL) * Provide insight on future scope, task assignments, and process improvements within our Agile cadence What You Will Learn: * Full software development lifecycle within defense industry * Agile development within a classified environment * Integration and validation on a variety of hardware controller cards * Best practices in secure software coding on embedded systems * Opportunity to grow into Technical Lead or Product Owner ## Related Videos - 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