> Markdown version of [/jobs/ext/1845091-apu-tj-engine-system-software-principal-engineer-p4-onsite](https://www.wearedevelopers.com/jobs/ext/1845091-apu-tj-engine-system-software-principal-engineer-p4-onsite). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # APU/TJ Engine System Software Principal Engineer P4 (Onsite) - **Company:** RTX - **Location:** Jupiter, FL, United States - **Experience:** Expert - **Salary:** $107,500.0 - $204,500.0 - **Contract:** Permanent contract - **Skills:** Algorithm Design, Software Product Management, Software Architecture, Systems Development Life Cycle, Simulink, Software Engineering, System Software, Systems Integration, Model-Driven Development - **Published:** July 7, 2026 - **Apply:** https://globalhr.wd5.myworkdayjobs.com/REC_RTX_Ext_Gateway/job/US-FL-JUPITER-ADR--17900-Beeline-Hwy--ADR-BLDG/APU-TJ-Engine-System-Software-Principal-Engineer-P4--Onsite-_01857041 ## About the Role This job requires a U.S. Person. A U.S. Person is a lawful permanent resident as defined in 8 U.S.C. 1101(a)(20) or who is a protected individual as defined by 8 U.S.C. 1324b(a)(3). U.S. citizens, U.S. nationals, U.S. permanent residents, or individuals granted refugee or asylee status in the U.S. are considered U.S. persons. For a complete definition of "U.S. Person" go here. https://www.ecfr.gov/current/title-22/chapter-I/subchapter-M/part-120/subpart-C/section-120.62, * Bachelor's degree in Science, Technology, Engineering or Mathematics (STEM) * 8 years of engineering experience or 5 years with an advanced degree Qualifications We Prefer: * Familiarity with gas turbine engine operation, control, and system integration. * Experience in engine control system design and validation. * Familiarity with MBSE tools such as Cameo Systems Modeler. * Proficient in system/software design tools such as Cameo Systems Modeler and MATLAB Simulink. * Experience in engine control input/output electrical interfaces. * Experience in fuel and actuation architecture studies and system design. ## Description Controls and Diagnostic Systems is responsible for all aspects of Pratt & Whitney engine control and diagnostic system development including: requirements analysis & definition, system & software architecture, algorithm design, and product software design, verification & validation. We integrate the control and diagnostic system design across other engine system modules and with the air vehicles and provide support throughout the complete engine product life cycle. In this role, you will be supporting the Auxiliary Power Unit (APU) and Expendable Turbojet (TJ) business units., * Support control system integration across engine subsystems including FADEC (Full Authority Digital Engine Control), sensors, actuators, fuel systems, and electro-mechanical components. * Develop, manage, and decompose system and subsystem requirements in accordance with ARP4754 guidelines. * Own requirements lifecycle activities including authoring, allocation, traceability, validation, and verification. * Support hardware selection, trade studies, and integration of sensors, effectors, and control system components. * Apply Model-Based Systems Engineering (MBSE) using Cameo Systems Modeler. * Translate control system requirements into Model-Based Design (MBD) implementations in MATLAB Simulink for software development. * Develop and validate Simulink models for actuation systems (starter-generators, fuel systems, pneumatic systems). * Up to 10% Travel What You Will Learn: This role will give you exposure to a wide variety of engineering challenges and you will be involved in a critical role for F135 and F119 along other commercial and military programs. The position is based at the P&W West Palm Beach facility and will report to the DPLM, Associate Director., CDS develops complex, cyber-resilient control systems and software for commercial and military engines including power and thermal management Systems and auxiliary power units. CDS also develops advanced diagnostic & health management systems to monitor our products, forecast events and help facilitate MRO operations. With growing emphasis on sustainability, CDS is on the forefront of system development for hybrid and electric propulsion. What is my role type? In addition to transforming the future of flight, we are also transforming how and where we work. We've introduced role types to help you understand how you will operate in our blended work environment. Onsite: Employees who are working in Onsite roles will work primarily onsite. This includes all production and maintenance workers, as they are essential to the development of our engines. 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. 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. ## Related Videos - [Building a hypercar from scratch](https://www.wearedevelopers.com/videos/607-building-a-hypercar-from-scratch) - [Data Science, ML & AI in the Oil and Gas Industry at NDT Global - Dr. Katja Träumner](https://www.wearedevelopers.com/videos/1308-data-science-ml-ai-in-the-oil-and-gas-industry-at-ndt-global-dr-katja-traumner) - [How Regex Works: The Secret Sauce Behind Pattern Matching](https://www.wearedevelopers.com/videos/1212-how-regex-works-the-secret-sauce-behind-pattern-matching) - [Flexibility is Key: Unlocking the Advantages of Versatile Software Solutions for Strategic Innovatio](https://www.wearedevelopers.com/videos/1943-flexibility-is-key-unlocking-the-advantages-of-versatile-software-solutions-for-strategic-innovatio) - [Software is the New Fuel, AI the New Horsepower - Pioneering New Paths at Mercedes-Benz](https://www.wearedevelopers.com/videos/1388-software-is-the-new-fuel-ai-the-new-horsepower-pioneering-new-paths-at-mercedes-benz) - [Eclipse Qrisp: Next Generation of Quantum Algorithm Development](https://www.wearedevelopers.com/videos/1155-eclipse-qrisp-next-generation-of-quantum-algorithm-development) ## Related Articles - [How to Become an AI Engineer](https://www.wearedevelopers.com/magazine/331-how-to-become-an-ai-engineer) - [Where To Find Software Engineering Jobs](https://www.wearedevelopers.com/magazine/396-where-to-find-software-engineering-jobs) - [The 12 Best Jobs for Software Engineers](https://www.wearedevelopers.com/magazine/401-the-12-best-jobs-for-software-engineers) - [How software is steering vehicle technology](https://www.wearedevelopers.com/magazine/515-how-software-is-steering-vehicle-technology) - [Fully Remote Software Engineer Jobs](https://www.wearedevelopers.com/magazine/447-fully-remote-software-engineer-jobs) - [What Jobs Can You Get with a Software Engineering Degree?](https://www.wearedevelopers.com/magazine/398-what-jobs-can-you-get-with-a-software-engineering-degree)