**Date Posted:** 2025-09-30 **Country:** United States of America **Location:** HNC01: UTAS Headquarters (HS) 2730 West Tyvola Road, Charlotte, NC, 28217 USA **Position Role Type:** Hybrid **U.S. Citizen, U.S. Person, or Immigration Status Requirements:** U.S. citizenship is required, as only U.S. citizens are authorized to access certain necessary systems. **Security Clearance:** None/Not Required Collins Aerospace is seeking a highly skilled and experienced Senior Software Engineer to support the development, sustainment, and maintenance of the custom co-simulation DESYRE application and framework. This role will drive technical excellence by ensuring robust backend architecture, delivering new features, and resolving critical defects. The engineer will serve as a technical leader, applying deep knowledge of computational models, hybrid system execution, and interoperability standards to advance aerospace engineering simulation capabilities. **_**This is a hybrid role that requires proximity to a major Collins Aerospace site.**_** **What YOU will do:** + Lead design, development, and maintenance of components for the DESYRE simulation environment. + Perform quality assurance, bug triage, and resolution (e.g., fixing DESYRE backend bugs to ensure stability and accuracy). + Engineer and mature new features, such as updating the DESYRE Model Builder to support SysMLv2 integration. + Apply advanced knowledge of Models of Computation and Execution Semantics (synchronous languages, state machines, discrete event, continuous time, hybrid systems). + Ensure compliance and innovation in hybrid systems model-exchange and co-simulation standards (FMI, TLM, HLA, ED247, DPC). + Provide technical leadership in software design principles, architecture patterns, and system integration. + Collaborate with cross-functional teams, including systems and software engineering, model-based design, and test engineering, to deliver end-to-end solutions. + Mentor junior engineers and contribute to engineering excellence practices across the enterprise. **Qualifications YOU Must Have:** + Must be a U.S. Citizen. + Typically requires a University Degree and minimum 10 years prior relevant experience or an Advanced Degree in a related field and minimum 7 years of experience. + 10+ years of professional software engineering experience, with at least 5 years in aerospace, defense, or high-reliability systems. + Experience with principles in the domain of modelling (model management, model transformation, etc) and simulation (multi-formalism, hybrid simulation, co-simulation, etc.) + Knowledge of model-based theory (abstract interpretation, static and dynamic analysis), practice (experience with modeling and simulation environments, solvers, etc.), and a good knowledge of mathematical formalization, discrete and continuous dynamics modeling + Expert-level knowledge of Models of Computation and Execution Semantics (synchronous, discrete-event, continuous-time, hybrid). + Proven expertise with co-simulation and model-exchange standards: Functional Mock-up Interface (FMI), Transaction-Level Modeling (TLM), High-Level Architecture (HLA), Aerospace Data Exchange Standard ED247, Distributed Parallel Co-simulation (DPC) + Proficiency in Python, C++, SystemC, and strong familiarity with IEEE Std 1666-2023. + Strong background in software design principles, architecture, and system integration. + Demonstrated ability to lead technical efforts, mentor teams, and deliver complex projects. **Qualifications We Prefer:** + Experience in aerospace/defense simulation or safety-critical systems. + Familiarity with DevSecOps pipelines, model-based engineering (MBSE, MB Design, MB Definition), and digital engineering environments. + Knowledge of real-time and distributed simulation architecture. + Active security clearance or ability to obtain one. **What We Offer:** Some of our competitive benefits package includes: + Medical, dental, and vision insurance. + Three weeks of vacation for newly hired employees. + Generous 401(k) plan that includes employer matching funds and separate. employer retirement contribution, including a Lifetime Income Strategy option. + Tuition reimbursement program. + Student Loan Repayment Program. + Life insurance and disability coverage. + Optional coverages you can buy pet insurance, home and auto insurance, additional life and accident insurance, critical illness insurance, group legal, ID theft protection. + Birth, adoption, parental leave benefits. + Ovia Health, fertility, and family planning. + Adoption Assistance. + Autism Benefit. + Employee Assistance Plan, including up to 10 free counseling sessions. + Healthy You Incentives, wellness rewards program. + Doctor on Demand, virtual doctor visits. + Bright Horizons, child, and elder care services. + Teladoc Medical Experts, second opinion program. +  And more!  **Learn More & Apply Now!** Do you want to be part of a new, exciting initiative to combine foundational IT with new digital technologies?  Our Digital Technology team is driving business efficiencies and a better customer experience by connecting technologies, people, information and processes. From making aircraft more electric, intelligent and integrated to building new software platforms such as Internet of Things, big data, artificial intelligence, and blockchain, there’s no better place to be right now than in digital. If you’re an agile thinker who enjoys utilizing modern technology to make big improvements, then you’re a perfect fit for this team. Join Collins Aerospace to help us revolutionize the aerospace industry today! * Please consider the following role type definitions as you apply for this role. Hybrid: Employees who are working in Hybrid roles will work regularly both onsite and offsite. The ratio of time working onsite will be determined in partnership with your leader. _Regardless of your role type, collaboration and innovation are critical to our business and all employees will have access to digital tools so they can work with colleagues around the world – and access to Collins sites when their work requires in-person meetings._ 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. The salary range for this role is 124,000 USD - 250,000 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 (http://www.rtx.com/privacy/Job-Applicant-Privacy-Notice) to read the Policy and Terms Raytheon Technologies is An Equal Opportunity/Affirmative Action Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability or veteran status, age or any other federally protected class.