Top 173 System security engineer principal Jobs in Littleton, Co

Principal Systems Engineer
Raytheon —Aurora, CO
- $107,500 - $204,500 a year
- Full-time
- Engineering
- System design
- 8 years
- Paid holidays
- Disability insurance
Principal Lead Systems Trainer – Level 3
Northrop Grumman —Aurora, CO
- $114,000 - $171,000 a year
- 12 hour shift
- Microsoft Outlook
- Master's degree
- Bachelor's degree
- Paid holidays
- Disability insurance
Principal Satellite Systems Engineer
Vantor Holdings Inc. —Westminster, CO
- $135,000 - $198,000 a year
- Full-time
- 6 years
- Writing skills
- Engineering
- 401(k) matching
- Pet insurance
Quick Apply
13d
Principal Systems Engineer Int & Test – Automated Testing
Raytheon —Aurora, CO
- $107,500 - $204,500 a year
- Full-time
- Microsoft Excel
- 8 years
- Senior level
- Paid holidays
- Disability insurance
Principal Systems Engineer
Raytheon —Aurora, CO
- $107,500 - $204,500 a year
- Full-time
- 8 years
- Scripting
- APIs
- Paid holidays
- Disability insurance
Principal Scrum Master (Onsite)
Raytheon —Aurora, CO
- $107,500 - $204,500 a year
- Full-time
- Java
- 8 years
- In-person
- Paid holidays
- Disability insurance
System Security Engineer - Principal
BAE Systems Inc. —Broomfield, CO
- $118,095 - $200,762 a year
- Full-time
- Laboratory
- Bachelor of Science
- Office
- Health savings account
- Paid holidays
5d
Principal Cyber Security Engineer
MANTECH —Denver, CO
- Full-time
- 7 years
- System design
- Research
- Opportunities for advancement
Senior Presales Systems Engineer
Boomi —Denver, CO
- $175,000 - $219,000 a year
- Remote
- Azure
- AWS
- Senior level
(USA) Principal, Systems and Infrastructure Engineer, Information Security
Vizio —Denver, CO
- $121,000 - $242,000 a year
- Azure
- Computer Science
- High school
- Paid jury duty
- Disability insurance
Principal Systems Security Engineer / Senior ISSM
Sierra Nevada Corporation —Lone Tree, CO
- $165,010.21 - $226,889.04 a year
- Full-time
- 11+ years
- Office
- Presentation skills
- Health insurance
- Dental insurance
Principal Systems Engineer (Clearance Required)
Sierra Space —Centennial, CO
- $173,748.00 - $238,903.50 a year
- Full-time
- Engineering
- 11+ years
- Bachelor's degree
- Health insurance
- Dental insurance
Principal Software Engineer
Sierra Nevada Corporation —Lone Tree, CO
- $165,010.21 - $226,889.04 a year
- Full-time
- Hybrid work
- Computer Science
- 11+ years
- Java
- Health insurance
- Dental insurance
Machine Learning Engineer / Specialist
DCCA —Littleton, CO
- $75,000 - $230,000 a year
- Computer science
- Azure
- Computer Science
- Disability insurance
- Health insurance
Principal Platform Engineer, AI & Infrastructure
True Anomaly —Denver, CO
- $255,000 - $375,000 a year
- Hybrid work
- Azure
- Office
- AWS
- Health savings account
- Paid holidays
Systems Engineering
DCCA —Denver, CO
- $75,000 - $260,000 a year
- Bachelor's degree
- Mentoring
- Entry level
- Disability insurance
- Health insurance
Principal Test Engineer
Sierra Nevada Corporation —Lone Tree, CO
- $143,487.14 - $197,294.82 a year
- Full-time
- Bachelor of Science
- System design
- 11+ years
- Health insurance
- Dental insurance
Principal Data Engineer
Empower Annuity Insurance Company of America —Greenwood Village, CO
- $151,800 - $220,050 a year
- Remote
- Computer Science
- Office
- SQL
- Paid parental leave
- Paid holidays
Principal Deep Space RF Communications Architect
Blue Origin —Denver, CO
- $169,624.00 - $237,473.25 a year
- Full-time
- Background check
- 11+ years
- Office
- Paid parental leave
- Paid holidays
Engineer Senior Principal – Systems – Part-Time
BAE Systems Inc. —Broomfield, CO
- $132,962 - $226,035 a year
- Part-time
- Hybrid work
- Bachelor of Science
- Office
- Presentation skills
- Health savings account
- Paid holidays
11d

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Principal Systems Engineer

Raytheon -
Aurora, CO

Apply Now

Job Details

Full-time
$107,500 - $204,500 a year

Benefits

Paid holidays
Disability insurance
Health insurance
Dental insurance
Flexible spending account
Paid time off
Parental leave
Employee assistance program
Vision insurance
401(k) matching
Flexible schedule
Life insurance

Qualifications

Software engineering
Systems analysis
Design (software development lifecycle)
Data analysis software

Full Job Description

Date Posted:

2026-07-24

Country:

United States of America

Location:

US-CO-AURORA-S75 ~ 16800 E Centretech Pkwy ~ BLDG S75

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:

DoD Clearance: Secret

Security Clearance Status:

Active and existing security clearance required on day 1

At Raytheon, the foundation of everything we do is rooted in our values and a higher calling – to help our nation and allies defend freedoms and deter aggression. We bring 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. Our team solves tough, meaningful problems that create a safer, more secure world.

We have an exciting opportunity for a Principal Systems Engineer – Modeling, Simulation & Analysis supporting one of our premier programs within Raytheon, an RTX Business. In this role, your experience with modeling and simulation, systems engineering analysis, software development, and performance assessment will be instrumental in the development of next-generation missile and sensor systems. You will collaborate across integrated product teams consisting of Guidance, Navigation & Control (GNC), Signal Processing, and Performance Simulation engineers to develop and evaluate high-fidelity simulation environments supporting mission-critical defense capabilities. The work is on-site in Aurora, CO.

What You Will Do

Develop high-fidelity models and simulations to support missile design, performance assessment, and flight test activities
Design, develop, and implement modeling and simulation solutions while conducting trade studies and evaluating system and subsystem performance
Collaborate with Guidance, Navigation & Control (GNC), Signal Processing, and Systems Engineering teams to execute simulation activities in support of program objectives and schedules
Analyze simulation results and provide technical recommendations that influence system architecture and design decisions
Support product development throughout the entire lifecycle, from initial concept through fielded deployment
Provide technical leadership and guidance to engineering teams while supporting design reviews, technical interchange meetings, and customer engagements
Contribute to the development of technology roadmaps and innovative modeling solutions that support future mission capabilities

Qualifications You Must Have

Typically requires a Bachelor's Degree in Engineering, Science, Physics, Mathematics, or another STEM discipline and a minimum of 8 years of prior relevant experience
Experience applying object-oriented software design and programming using C or C++
Experience using Python or MATLAB to analyze engineering data and evaluate system performance
Experience developing models or simulations of physical systems and applying modeling, simulation, statistical analysis, or engineering analysis to evaluate system solutions
Active and transferable DoD Secret U.S. government-issued security clearance is required prior to start date, with the ability to obtain Special Program Access after start. U.S. citizenship is required, as only U.S. citizens are eligible for a security clearance.

Qualifications We Prefer

Advanced Degree in Engineering, Science, Mathematics, or another STEM discipline
Experience applying systems engineering principles within multi-disciplinary engineering teams
Experience developing and presenting technical briefings to customers and engineering leadership
Experience developing Guidance, Navigation & Control (GNC) algorithms, signal processing algorithms, or missile performance models
Experience with control hardware design, hardware/software integration, or systems integration and test
Experience modeling flight dynamics, physics-based systems, or missile performance characteristics
Experience working in UNIX or Linux environments and using software configuration management tools such as Git
Coursework or experience in radar, signal and image processing, EO/IR systems, digital communications, probability and statistics, linear algebra, estimation theory, optimal control, system architecture, inertial navigation, or guidance theory

What We Offer

Our values drive our actions, behaviors, and performance with a vision for a safer, more connected world. At RTX we value: Safety, Trust, Respect, Accountability, Collaboration, and Innovation
Relocation eligible

Learn 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.
This position requires a security clearance. DCSA Consolidated Adjudication Services (DCSA CAS), an agency of the Department of Defense, handles and adjudicates the security clearance process. More information about Security Clearances can be found on the U.S. Department of State website here: https://www.state.gov/m/ds/clearances/c10978.htm

Location:

Aurora, CO: https://careers.rtx.com/global/en/raytheon-aurora-co-location

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 107,500 USD - 204,500 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.

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