Principal Embedded System Security Engineer (Onsite - Largo, FL) Secret clearance required

Prattwhitney; Largo (FL); On-site; USD 108,000 - 205,000; Full time

Benefits offered by this job

Medical, dental, and vision insurance

Three weeks of vacation

401(k) plan with employer matching

Tuition reimbursement

Employee assistance program

Life insurance and disability coverage

Job summary

RTX Collins Aerospace in Largo, FL is seeking a Principal Embedded System Security Engineer to lead security across defense programs. The role supports DoD missions, requires active SECRET clearance and US citizenship, and is onsite in Largo with relocation assistance available.

You will work within the Product Cybersecurity Organization, coordinating with systems engineers and developers to ensure security is foundational in design, testing, and deployment of mission-critical embedded systems

Qualifications

• Degree in Science, Technology, Engineering or Mathematics (STEM) or advanced related degree with relevant experience.

Responsibilities

• Lead system certification and RMF ATO activities including NSA Type 1 certification.
• Decompose requirements, allocate and verify security across the system.
• Identify security vulnerabilities in requirements and architecture.
• Collaborate with engineers to integrate security into design and verification.
• Develop security test plans and conduct evaluations with remediation analysis.

Skills

System Security Engineering

RMF

Security clearance

US citizenship

Technical writing

Requirements decomposition

Software/hardware security

Education

B.S. in STEM

Advanced degree in related field

Tools

DOORS

JIRA

Confluence

CAMEO MBSE

Job description

Date Posted: 2026-10-28 Country: United States of America Location: US-FL-LARGO-382SR ~ 7887 Bryan Dairy Rd ~ BLDG 600 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: Secret - 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. Collins Aerospace is a leader in technologically advanced, intelligent solutions that help redefine the aerospace and defense industry. With a comprehensive portfolio and deep technical expertise, we help customers meet the demands of the global market. Join us and help shape the future of aerospace and defense. You will be a member of the Collins Product Cybersecurity Organization (PCO) supporting strategic defense and protected communication systems programs. We are a growing business developing new products in an aggressive andcompetitive market. The new designs are exciting and technically challenging. The Product Cybersecurity Engineering DoD East Florida team is hiring a Principal Embedded System Security Engineer to support programs for our US military and various international customers, keeping the world safe from foreign threats. This team supports multiple Collins contracts and is seeking to fill roles across several open contracts – our goal is to align each new hire with a position that best suits their skills and allows for career growth. The ideal candidate will be skilled in requirement allocation and decomposition, analyzing system architectures, designing security features and principles, assessing security vulnerabilities (scanning), and formal cybersecurity test and evaluation (CT&E). The candidate will report to the Senior Manager of Cybersecurity Engineering in Largo FL and work collaboratively with cross-functional engineering teams on the program they support. This role will be worked onsite in Largo, FL and will require an active SECRET clearance. Relocation assistance is available.

What You Will Do:

• Lead system certification and accreditation efforts, including Risk Management Framework (RMF) Authorization To Operate (ATO) and National Security Agency (NSA) Type 1 Cryptographic Certification
• Lead cybersecurity requirement decomposition, allocation, implementation, and verification utilizing system engineering practices.
• Analyze system requirements, models, and diagrams to identify potential security vulnerabilities.
• Participate in system design discussions and provide security engineering input
• Collaborate with systems engineers and developers to integrate security considerations into system design.
• Work as part of a team, contributing to a culture of collaboration and continuous learning
• Maintain awareness of evolving security threats and industry best practices
• Participate in Security focused-System Verification and Validation including writing test plans and procedures, performing test conduct, and providing remediation recommendation analysis

Qualifications You Must Have:

• Typically requires a degree in Science, Technology, Engineering or Mathematics (STEM) and minimum 8 years prior relevant experience or an Advanced Degree in a related field and minimum 5 years of experience
• Active and transferable SECRET clearance is required prior to start date
• U.S. citizenship is required, as only U.S. citizens are eligible for a security clearance
• Direct experience in System Security Engineering
• Experience with Risk Management Framework (RMF) applied to mission systems used in disconnected DoD environments
• Experience with general technical security concepts, technologies, and implementations
• Technical writing skills and ability to develop security documentation
• Analytical skills with the ability to perform deep dives into system requirements
• Experience interpreting system models, diagrams, and architectures to assess security risks
• Willingness to learn about satellite systems, communication systems, and evolving security technologies

Qualifications We Prefer:

• Experience with National Security Agency (NSA) cryptographic certification, Cross Domain Solution (CDS) requirements, and National Information Assurance Partnership (NIAP)
• Experience in at least two of the following areas: System, Test, Software, Mechanical, Electrical Engineering
• Familiarity with DOORS, JIRA, Confluence, Cameo (MBSE experience), or other systems modeling and agile tools
• Advanced Security-related certifications (e.g., CISSP, Sec+, etc.) and Electrical or Computer Engineering Degree
• Prior experience working with security protocols used in embedded systems and communications for aerospace environments
• Familiarity with DoD focused security assessment tools, e.g. SCC, NMAP, Evaluate-STIG,Nessus, ACAS, Vulnerator, eMASSster, etc.
• Willingness to learn about satellite systems, communication systems, and evolving security technologies
• Exemplifies the RTX leadership behavior including collaboration, effective communications, courage, customer focus, develops talent, drives results, instills trust

What We Offer:

• Medical, dental, and vision insurance
• Three weeks of vacation for newly hired employees
• Generous 401(k) plan that includes employer matching funds and separate employer retirement contribution, including a Lifetime Income Strategy option
• Tuition reimbursement program
• Student Loan Repayment Program
• Life insurance and disability coverage
• Optional coverages you can buy pet insurance, home and auto insurance, additional life and accident insurance, critical illness insurance, group legal, ID theft protection
• Birth, adoption, parental leave benefits
• Carrot Health, fertility, and family planning
• Adoption Assistance
• Autism Benefit
• Employee Assistance Plan, including up to 10 free counseling sessions
• Healthy You Incentives, wellness rewards program
• Doctor on Demand, virtual doctor visits
• Bright Horizons, child and elder care services
• Teladoc Medical Experts, second opinion program
• And more!

Collins Aerospace, an RTX company, is a leader in technologically advanced and intelligent solutions for the global aerospace and defense industry. Collins Aerospace has the capabilities, comprehensive portfolio, and expertise to solve customers’ toughest challenges and to meet the demands of a rapidly evolving global market. Collins Aerospace makes modern flight possible. Of course, that wouldn’t be possible without the capabilities and technologies of our organization, as well as our engineers – a highly skilled, accomplished network that spans more than 180 sites, 24 countries and 6 Strategic Business Units (SBUs). Our industry‑leading experts are setting the standards for the aerospace industry and paving the way for the future. But as new challenges present themselves, we need fresh, creative and motivated minds to overcome these hurdles, help us break barriers and achieve new levels of innovation. Do you have what it takes to join a global organization that doesn’t shy away from big opportunities? If so, we invite you to join our ranks and create the next generation of aerospace technologies. Together, we will nurture an engineering culture that values intellectual curiosity, risk takers and integrity. A place where we will challenge ourselves, our teams, and the status quo and where we will work to find a way – the right way – to achieve what others can only dream of.

*Please ensure the role type (defined below) is appropriate for your needs before applying to this role. This position is classified as: 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 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.

RTX is an aerospace and defense company that provides advanced systems and services for commercial, military and government customers worldwide. It comprises three industry‑leading businesses – Collins Aerospace, Pratt & Whitney, and Raytheon. Its 195,000 employees enable the company to operate at the edge of known science as they imagine and deliver solutions that push the boundaries in quantum physics, electric propulsion, directed energy, hypersonics, avionics and cybersecurity. The company, formed in 2020 through the combination of Raytheon Company and the United Technologies Corporation aerospace businesses, is headquartered in Arlington, Virginia.