Senior Systems Engineer (GNC Analyst) (Onsite)

RTX (Raytheon); Pasadena (CA); On-site; USD 125,000 - 150,000; Full time

Job summary

RTX in Pasadena seeks a senior engineer to lead high-fidelity modeling of electromechanical actuators and sensors, validate simulations with testbed data, and drive requirements for future hardware iterations. You will develop low-fidelity surrogates for integration into larger simulations and deliver rapid insights to sponsors.

The role requires 5+ years in engineering, strong Matlab/Simulink/C programming skills, and an active TS/SCI clearance.

Qualifications

• Typically requires a Bachelor's in Science, Technology, Engineering, or Mathematics (STEM preferred) and a minimum of 5 years of prior engineering experience.
• Experience in Matlab, Simulink and the C programming language.
• Experience developing clear and adaptable models of complex electromechanical systems.
• Experience delivering professional presentations.
• 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.

Responsibilities

• 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 for larger system simulations.
• Study Support: Execute rapid-turnaround tasks (2-3-week cycles) to support sponsor-driven studies.
• Simulation Maintenance: Maintain the project’s primary simulation environment for stakeholders.
• Vendor Technical Integration: Participate in vendor meetings to reflect external hardware/software specs in models.
• Technical Versatility: Be a flexible resource within a small team across GNC functions.
• Communication: Translate simulation data into plots and PowerPoint presentations.

Skills

Electromechanical modeling

Vendor collaboration

Presentation delivery

System-level simulations

Education

Bachelor's degree in STEM

Tools

MATLAB

Simulink

C programming

Job description

Date Posted: 2026-09-16
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 1

At 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.

What You Will Do

This 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.

• 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 5 years of prior engineering experience.
• Experience in Matlab, Simulink and the C programming language.
• Experience developing clear and adaptable models of complex electromechanical systems.
• Experience delivering professional presentations.
• 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

• Experience in signal Processing.
• Experience with high-bandwidth mechatronics and dynamics.
• Experience in research and development of precision pointing systems.
• Work in a complex multi-task, schedule-driven environment.
• Perform effectively with minimal day-to-day oversight.
• Advanced degree.

What We Offer

Our 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 available

Onsite : Employees who are working in Onsite roles will work primarily onsite. This includes all production and maintenance employees, as they are essent