Principal Systems Security Engineer (Onsite - Sterling, VA)

VulnU; Sterling (VA); On-site; USD 118,000 - 225,000; Full time

Benefits offered by this job

Medical, dental, and vision insurance

401(k) plan with employer matching

Tuition reimbursement program

Employee assistance program

Job summary

RTX Collins Aerospace in Sterling, VA seeks a Systems Security Engineer to strengthen enterprise environments supporting DoD missions. You will implement RMF-compliant architectures, secure Windows/Linux environments, and develop IaC with Ansible for repeatable provisioning.

The role requires active SECRET clearance, onsite work in Sterling, and hands-on security architecture, auditing, and accreditation support across multi‑platform systems.

Qualifications

• Degree in Science, Technology, Engineering or Mathematics (STEM) required with minimum 5 years of relevant experience, or an advanced degree with minimum 3 years.
• Active and transferable U.S. government issued Secret security clearance is required prior to start date.
• Experience with Linux or Windows environments and administrative tasks.

Responsibilities

• Develop, implement, and maintain secure system architectures meeting DoD RMF requirements with focus on risk reduction, automation, and control effectiveness.
• Engineer, deploy, and harden enterprise network and system solutions for high security, resilience, and performance.
• Configure, secure, and maintain Windows and Linux environments using approved baselines and automation.
• Create and secure IaC artifacts (Ansible, VMware templates) for repeatable, auditable provisioning.
• Design and optimize Ansible workflows for configuration compliance and patch management across multi‑platform systems.
• Support RMF accreditation activities with Government ISSM through documentation and assessment coordination.
• Install, configure, and troubleshoot enterprise firewalls/routers/switches for secure network segmentation.
• Conduct vulnerability analysis and security validation to ensure compliant, reliable system functionality.

Skills

RMF compliance

Windows/Linux admin

Active Directory

VMware

SIEM tools

Trellix Endpoint Security

Tenable

Ansible

IaC

Education

STEM degree

Advanced degree (related field)

Tools

VMware vCenter

vSphere

ESXi

Windows Server

Linux

Job description

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.Collins Aerospace is seeking a highly skilled Systems Security Engineer to strengthen and secure enterprise environments supporting Department of Defense (DoD) missions. The ideal candidate will bring deep expertise in Risk Management Framework (RMF) compliance, secure network architecture, operating system administration, and cybersecurity best practices. This role requires hands-on proficiency across Windows and Linux platforms, network infrastructure, and security control implementation, along with the ability to support accreditation activities and sustain mission‐critical systems. The selected candidate will play a pivotal role in designing, securing, and optimizing infrastructure to ensure operational resilience, regulatory compliance, and performance excellence within a high‐security environment. This role will be worked onsite in Sterling, VA and requires an active and transferrable SECRET clearance. Relocation assistance is not available. What You Will Do:Develop, implement, and maintain secure system architectures and technical solutions that meet all DoD RMF requirements, with a focus on risk reduction, automation, and control effectivenessEngineer, deploy, and harden enterprise network and system solutions to ensure high security, resilience, scalability, and performance across legacy and emerging infrastructuresConfigure, secure, and maintain Windows and Linux environments using industry best practices, approved security baselines, and automated configuration management toolsCreate, manage, and secure Infrastructure as Code (IaC) artifacts—such as Ansible and VMWare templates—to enable repeatable, auditable, and secure system provisioningDesign and optimize Ansible automation workflows to enforce configuration compliance, patch management, and secure baseline deployment across multi‐platform systemsSupport RMF accreditation activities in collaboration with the Government ISSM, including documentation development, control implementation, assessment coordination, and continuous monitoringInstall, configure, and troubleshoot enterprise firewalls, routers, and switches to maintain secure network segmentation, traffic integrity, and a robust defensive security postureConduct structured hardware and software testing, vulnerability analysis, and security validation to ensure secure, reliable system functionality and compliance with security standards Qualifications You Must Have:Typically requires a degree in Science, Technology, Engineering or Mathematics (STEM) and minimum 5 years prior relevant experience or an Advanced Degree in a related field and minimum 3 years of experienceActive and transferable U.S. government issued Secret security clearance is required prior to start dateLinux or Windows experienceExperience with Active Directory, VMware, Administration, SIEM Tools (Splunk or Kiwi), backup and recovery software, Trellix Endpoint Security and TenableQualifications We Prefer:Department of Defense Directive (DoDD) 8140 / 8570 Certification requirements (CompTIA Security CE or equivalent certification and an Operating System Certification)Experience with NISPOM, JAFAN, JSIG, DFARS and/or DoD/RMFExperience with data storage, NAS, and SAN technologies and solutionsExperience using VMWare vCenter, vSphere, and ESX and/or other virtual computing methodsExperience supporting engineers in software, simulations, and hardware developmentExperience with Microsoft WSUSExchange scripting experience 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! Learn More & Apply Now!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 118,300 USD - 224,900 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.