Principal Systems Engineer (GNC Analyst) (Onsite)

RTX (Raytheon); Pasadena, Town of Oak Grove (CA, WI); On-site; USD 150,000 - 190,000; Full time

Job summary

RTX (Raytheon) in Pasadena, California, is seeking a Guidance, Navigation, and Control Analyst (Principal Systems Engineer) to lead high-fidelity modeling and validation of electromechanical actuators and sensors. The role focuses on risk reduction, requirements definition, and integration into larger system simulations.

You will distill complex models into surrogate versions, support rapid studies, and maintain the central simulation environment, working with vendors and internal stakeholders

Qualifications

• Bachelor's degree in Science, Technology, Engineering, or Mathematics (STEM) preferred.
• Minimum of 8 years of prior engineering experience.
• Experience with MATLAB, Simulink, and C programming language.

Responsibilities

• Maintain, modify, and develop high-fidelity simulations of electromechanical actuators and sensors.
• Tune and validate simulations against actual testbed data for accuracy.
• Use high-fidelity models to drive risk reduction and establish technical requirements.
• Create and maintain low-fidelity surrogate models for larger system simulations.
• Perform rapid-turnaround studies (2–3 weeks) and present results with plots and slides.
• Maintain the project’s primary simulation environment for stability across stakeholders.
• Engage with external vendors and hardware suppliers to reflect hardware/software specs.
• Be a flexible, multi-role contributor within a small team and communicate complex data clearly.

Skills

MATLAB

Simulink

C programming

Signal processing

System modeling

Presentations

Vendor collaboration

Mechatronics

Education

Bachelor's in STEM

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

Company Overview

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.

Position

Raytheon is seeking a Guidance, Navigation, and Control Analyst (Principal Systems Engineer) : Location: Pasadena, California

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.

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 processing
• Experience 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 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