Principal Systems Engineer (GNC Analyst) (Onsite)

Job ID: 01875347Posted: Posted TodayStart Date: 2026-09-15Location: US-CA-PASADENA-4800-CUST ~ 4800 Oak Grove Dr ~ OAK GROVE (External Site)Country: United States of AmericaTime Type: Full timeDate Posted:2026-09-15 Country:United States of America Location:US-CA-PASADENA-4800-CUST ~ 4800 Oak Grove Dr ~ OAK GROVE (External Site) 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: TS/SCI - Current Security Clearance Status: Active and existing security clearance required on day 1At RTX, the world’s largest aerospace and defense company, 185,000 great minds are united by purpose and inspired to make a difference solving the world’s most complex problems. With our three market leading businesses, world-class operations and investments in research and development, we offer capabilities and opportunity no one else can. Together, we push the boundaries of known science and find new ways to connect and protect our world.Raytheon brings the strength of more than 100 years of experience and renowned engineering expertise to meet the needs of today’s mission and stay ahead of tomorrow’s threat. We deliver solutions that help our nation and allies defend freedom and deter aggression, creating a safer, more secure world. Join us and help shape the future of aerospace and defense.Raytheon is seeking a Guidance, Navigation, and Control Analyst (Principal Systems Engineer): Location: Pasadena, CaliforniaWhat You Will DoThis role is critical for the risk reduction and requirement-definition phase of the project's mechanisms. High-fidelity modeling of electromechanical actuators and sensors is required to validate designs against testbed data and to inform the specifications of future hardware iterations.Distill complex models into low-fidelity versions for integration into larger system-level simulations.Provide rapid-turnaround study results for sponsors and maintaining long-term, high-fidelity simulation infrastructure.Responsibilities include, but are not limited to:High-Fidelity Modeling: Maintain, modify, and develop high-fidelity behavioral simulations of electromechanical actuators and sensors.Model Validation: Tune and validate simulations against actual testbed data to ensure physical accuracy.Risk Reduction & Requirements: Utilize high-fidelity models to conduct risk reduction activities and establish technical requirements for future versions of mechanisms.System Integration: Create and maintain low-fidelity "surrogate" models that approximate actuator behavior for use in larger, integrated system simulations.Study Support: Execute rapid-turnaround tasks (2–3-week cycles) to support sponsor-driven studies, delivering results via plots and presentations.Simulation Maintenance: Provide ongoing maintenance and updates to the project’s primary simulation environment to ensure stability for other project stakeholders.Vendor Technical Integration: Participate in vendor meetings and technical reviews to absorb critical design information, ensuring that behavioral models accurately reflect external hardware and software specifications.Technical Versatility: Act as a flexible resource within a small team, providing overlap and support for other GNC functions as bandwidth requires.Communication: Translate complex simulation data into clear, concise plots and PowerPoint presentations for internal and external stakeholders.Qualifications You Must Have Typically requires a Bachelor’s in Science, Technology, Engineering, or Mathematics (STEM preferred) and a minimum of 8 years of prior engineering experience.Experience in Matlab, Simulink and the C programming language.Experience in signal processingExperience developing clear and adaptable models of complex electromechanical systems.Experience delivering professional presentations.Experience with high-bandwidth mechatronics and dynamics.Experience in the research and development of precision pointing systems.Experience working directly with external vendors and hardware suppliers.An active and transferable TS/SCI U.S. government issued is required prior to start with the ability to obtain CI Poly after start date. U.S. citizenship is required, as only U.S. citizens are eligible for the required security clearance. Qualifications We Prefer Work in a complex multi-task, schedule-driven environment.Perform effectively with minimal day-to-day oversightAdvanced degreeWhat We OfferOur values drive our actions, behaviors, and performance with a vision for a safer, more connected world. At RTX we value: Trust, Respect, Accountability, Collaboration, and Innovation.Not Relocation Eligible – Relocation assistance not availableLearn More & Apply Now!Please consider the following role type definition as you apply for this role. Onsite: 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.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.The salary range for this role is 118,300 USD - 224,900 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