Principal Systems Engineer (GNC Analyst) (Onsite)

RTX; Pasadena (CA); On-site; USD 118,000 - 225,000; Full time

Benefits offered by this job

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

Holidays

Job summary

RTX in Pasadena seeks a Guidance, Navigation, and Control Analyst (Principal Systems Engineer) to lead high-fidelity modeling of electromechanical actuators and sensors, validate simulations against testbed data, and drive risk reduction and requirements for next-generation mechanisms.

The role requires 8+ years in engineering, MATLAB/Simulink and C, experience with high-bandwidth mechatronics, and active TS/SCI clearance.

Qualifications

• Bachelor's in STEM and a minimum of 8 years of 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.
• Active and transferable TS/SCI clearance and U.S. citizenship.

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.
• Risk Reduction & Requirements: Use high-fidelity models to conduct risk reduction 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, 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 models reflect external hardware/software specs.
• Technical Versatility: Act as a flexible resource within a small team, providing overlap and support for other GNC functions.
• Communication: Translate complex simulation data into clear plots and PowerPoint presentations for internal and external stakeholders.

Skills

MATLAB

Simulink

C programming

Signal processing

System modeling

Presentations

Mechatronics

Precision pointing

Vendor liaison

TS/SCI clearance

US citizenship

Education

Bachelor's degree 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

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.

Job Title

Guidance, Navigation, and Control Analyst (Principal Systems Engineer)

Job 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.

Salary Range

118,300 USD - 224,900 USD

Benefits

• 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
• Holidays

Incentive Compensation

• 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.

Additional Information

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.

Equal Opportunity Employer Statement

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.