Senior Principal Software Architect (Onsite)

Job ID: 01864021Posted: Posted TodayStart Date: 2026-08-06Location: US-TX-RICHARDSON-461 ~ 3200 E Renner Rd ~ RENNER BLDG 461Country: United States of AmericaTime Type: Full timeDate Posted:2026-08-06 Country:United States of America Location:US-TX-RICHARDSON-461 ~ 3200 E Renner Rd ~ RENNER BLDG 461 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: Secret - Current Security Clearance Status: Active and existing security clearance required on day 1Raytheon Company Managed by Collins AerospaceCollins Aerospace, an RTX company, is a leader in technologically advanced and intelligent solutions for the global aerospace and defense industry. Collins Aerospace has the capabilities, comprehensive portfolio, and expertise to solve customers’ toughest challenges and to meet the demands of a rapidly evolving global market.We have an opportunity for a Senior Principal Software Architect to join a cohort of 20+ talented software engineers in developing our Very Low Frequency (VLF) solution for the military. The government has requested a need for greater cyber security threat protection, software assurance, improvement in availability and reliability while harnessing the latest technologies for rapid development and deployment.Sign On Bonus EligibleWhat You Will Do: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 transmittersDefine, evolve, and optimize software and simulation design across mission-critical embedded platformsServe as technical lead for cross-functional development, driving software solutions to systems and hardware engineers while ensuring development team understands platform and hardware constraintsMentor and guide engineering teams in architectural best practices, modularity, code structure, and performance tradeoffs in real-time systemsIdentify areas for optimization and collaborate on architecture-level decisions along with other software Subject Matter Experts (SMEs) to meet system constraintsDefine software requirements and Unified Modeling Language (UML) design diagrams within a Model Based Systems Engineering (MBSE) toolDevelop 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 capabilitiesDrive 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 cadenceWhat You Will Learn:Full software development lifecycle within defense industryAgile development within a classified environmentIntegration and validation on a variety of hardware controller cardsBest practices in secure software coding on embedded systemsOpportunity to grow into Technical Lead or Product OwnerQualifications You Must Have: Extensive experience with real-time operating systems (RTOS), including development, debugging, and performance optimization of embedded software applicationsExperience with Model-Based Systems Engineering (MBSE), system decomposition, and interface control across disciplinesExperience with software lifecycle processes, configuration control, and change management in high-integrity development environmentsActive and transferable Secret U.S. government issued security clearance is required prior to start dateTypically 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 experienceQualifications We Prefer:Experience with multithreading, memory management, and performance optimization in complex environmentsExperience in secure coding practicesExperience with hardware-software integration and hardware-in-the-loop (HIL) testingExperience with development tool sets, including Jira, Git, Visual Studio Code, cmakeExperience with Qt framework and development tools to generate C++ and QML codeAbility to read electrical schematics and understand system‑level hardware interfacesExpertise in Programmable Logic Controllers (PLCs) that support C++-based application frameworksWhat We Offer:Some of our competitive benefits package includes: Medical, dental, and vision insuranceThree weeks of vacation for newly hired employeesGenerous 401(k) plan that includes employer matching funds and separate employer retirement contribution, including a Lifetime Income Strategy optionTuition reimbursement programStudent Loan Repayment ProgramLife insurance and disability coverageOptional coverages you can buy pet insurance, home and auto insurance, additional life and accident insurance, critical illness insurance, group legal, ID theft protectionBirth, adoption, parental leave benefitsOvia Health, fertility, and family planningAdoption Assistance         Autism BenefitEmployee Assistance Plan, including up to 10 free counseling sessionsHealthy You Incentives, wellness rewards programDoctor on Demand, virtual doctor visitsBright Horizons, child and elder care servicesTeladoc Medical Experts, second opinion programEligible for relocation assistance And more! Learn More & Apply Now!​Do you want to be a part of something bigger? A team whose impact stretches across the world, and even beyond? At Collins Aerospace, our Mission Systems team helps civilian, military and government customers complete their most complex missions — whatever and wherever they may be. Our customers depend on us for intelligent and secure communications, missionized systems for specialized aircraft and spacecraft and collaborative space solutions. By joining our team, you’ll have your own critical part to play in ensuring our customer succeeds today while anticipating their needs for tomorrow. Are you up for the challenge? Join our mission today. ​*Please ensure the role type (defined below) is appropriate for your needs before applying to this role. ​This is an Onsite role: 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. ​At Collins, the paths we pave together lead to limitless possibility. And the bonds we form – with our customers and with each other -- propel us all higher, again and again. ​Apply now and be part of the team that’s redefining aerospace, every day. Employee Referral Eligible#MISENGAs 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