Principal Embedded Systems Security Engineer (Onsite - Marlborough, MA) Secret clearance required

globalhr; Marlborough (MA); On-site; USD 120,000 - 160,000; Full time

Benefits offered by this job

Medical insurance

Dental insurance

Vision insurance

401(k) retirement plan

Paid time off

Job summary

RTX’s Collins Product Cybersecurity team seeks a Principal Embedded System Security Engineer to support DoD and international programs from Marlborough, MA. The role requires deep security analysis, architecture reviews, and vulnerability assessment for aerospace systems.

As part of a collaborative engineering culture, you will contribute to certification activities, design reviews, and test and evaluation, ensuring robust protection of sensitive defense systems while staying ahead of evolving

Qualifications

• Degree in Science, Technology, Engineering or Mathematics (STEM) with 8+ years of experience, or advanced degree with 5+ years.
• U.S. citizenship is required and active SECRET clearance before start date.
• Experience applying RMF to mission systems in DoD environments.
• Strong writing skills for security documentation.

Responsibilities

• Support system certification and accreditation efforts including RMF ATO.
• Analyze requirements and identify potential security vulnerabilities.
• Contribute to security design discussions with cross-functional teams.
• Integrate security considerations into system design with engineers.
• Maintain awareness of evolving threats and best practices.
• Participate in Security focused System Verification and Validation and write test plans.

Skills

Security engineering

RMF

Security testing

Technical writing

Education

STEM degree

Advanced degree (optional)

Tools

DOORS

JIRA

Confluence

Cameo

Job description

Date Posted: 2026-09-30

Country: United States of America

Location: US-MA-MARLBOROUGH-MA1 ~ 1001 Boston Post Rd ~ BLDG 1

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

Raytheon Company, Managed by Collins Aerospace

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 and competitive 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 System Security Engineering and work collaboratively with cross-functional engineering teams on the program they support.

This role will be worked onsite in Marlborough, MA. Relocation assistance is supported.

What You Will Do:

• Support system certification and accreditation efforts, including Risk Management
• Framework (RMF) Authorization To Operate (ATO) and National Security Agency (NSA) Type 1 Cryptographic Certification
• Support 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 nd 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 a minimum of 8 years of prior relevant experience, or an Advanced Degree in a related field and a minimum of 5 years of experience.
• U.S. citizenship is required, as only U.S. citizens are eligible for a security clearance
• Active and transferable SECRET U.S. government issued security clearance is required prior to start date
• Experience with Risk Management Framework (RMF) applied to mission systems used in disconnected DoD environments. Familiarity with general technical security concepts, technologies, and implementations
• Technical writing skills and ability to develop security documentation
• Experience interpreting system models, diagrams, and architectures to assess security risks

Qualifications We Prefer:

• Experience with National Security Agency (NSA) cryptographic certification, Cross Domain Solution (CDS) requirements, and National Information Assurance Partnership (NIAP)
• Willingness to learn about satellite systems, communication systems, and evolving security
• Experience in at least two of the following areas: Systems Engineering, Test Engineering, Software Engineering, Mechanical Engineering, Electrical Engineering
• Exemplifies the RTX leadership behavior including collaboration, effective communications, courage, customer focus, develops talent, drives results, instills trust
• 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
• 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.

What We Offer:

Some of our competitive benefits package includes:

• 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