Senior Systems Engineer – Information Security

L3Harris Technologies; South Carolina; On-site; USD 120,000 - 180,000; Full time

Job summary

L3Harris Technologies in Greenville, TX seeks a Senior Specialist, Systems Engineer - Information Security to lead risk assessments, deliver security requirements, and coordinate program-level security actions. The role emphasizes collaboration across software and hardware teams to secure missions and certifications.

The candidate will drive security metrics, manage DOORS/JIRA requirements, and ensure A&A activities while performing on-site work in a defense-focused environment.

Qualifications

• Bachelor's degree in engineering or related field with at least 6 years of relevant experience.
• Graduate degree with a minimum of 4 years of directly related experience.
• In lieu of a degree, at least 10 years of related professional experience.
• Experience in the design, development, and deployment of Systems Security Engineering solutions.
• Experience translating NIST 800-53 security controls into actionable requirements for product teams.
• Experience drafting Systems Security Engineering requirements and communicating across teams.
• Experience with the Risk Management Framework, including NIST and DoD standards.
• Experience preparing security documentation for certifications.
• Active DoD Secret clearance with the ability to obtain a Top Secret clearance.
• Preferred skills include proposal development, networking knowledge, Linux administration, Bash scripting, Python, Windows PowerShell, Windows administration, Nessus, Wireshark, Nmap, and Elastic Stack.
• Preferred experience also includes Linux audit/logging architecture, Active Directory/LDAP, NIST publications, app hardening with code-scanning tools such as Coverity or Fortify, eMass or Xacta, and DoD deployment logistics.

Responsibilities

• Participate in risk and vulnerability assessments of information systems to identify weaknesses, threats, and protection requirements.
• Coordinate the development of Security Impact Assessments for proposed system changes.
• Combine software and hardware engineering knowledge to support secure system delivery.
• Prepare and present technical findings in internal and external program meetings.
• Develop, monitor, and report technical metrics.
• Manage requirements in DOORS or JIRA throughout the project lifecycle.
• Communicate across and outside the organization to help leadership adopt new practices and approaches.
• Track A&A status for assigned systems and oversee accreditation and re-accreditation actions.
• Improve existing processes or establish new ones where needed.
• Work cross-functionally to ensure security requirements are addressed throughout the mission system development lifecycle.
• Perform security compliance scans, vulnerability analysis, and drive remediation of identified issues.
• Conduct periodic network vulnerability scans and recommend remediation options while ensuring compliance with corporate security policies and best practices.
• Develop and maintain ATO Body of Evidence artifacts.
• Work fully on-site, as this role cannot be performed remotely.

Skills

Security engineering

Risk management

Cross-functional collaboration

Compliance awareness

System security architecture

Education

Bachelor's degree in engineering or related field

Graduate degree with 4+ years of related experience

10+ years of related experience in lieu of degree

Tools

DOORS

JIRA

Nessus

Wireshark

Nmap

Elastic Stack

Coverity

Fortify

eMass

Xacta

Active Directory

LDAP

Job description

Requirements

Must have:

• We need a bachelors degree in engineering or a related field such as cybersecurity, computer science, electrical, mechanical, systems, software, or physics, along with at least 6 years of relevant experience.
• We will also consider a graduate degree with a minimum of 4 years of directly related experience.
• In lieu of a degree, we require at least 10 years of related professional experience.
• We are looking for experience in the design, development, and deployment of Systems Security Engineering solutions.
• We need experience translating NIST 800-53 security controls into actionable requirements that product teams can implement.
• We require experience drafting Systems Security Engineering requirements and communicating them effectively across teams.
• We need experience with the Risk Management Framework, including NIST and DoD standards.
• We require experience preparing security documentation for various certifications.
• We require an active DoD Secret clearance with the ability to obtain a Top Secret clearance.
• Preferred skills include proposal development, networking knowledge, Linux administration, Bash scripting, Python, Windows PowerShell, Windows administration, Nessus, Wireshark, Nmap, and Elastic Stack.
• Preferred experience also includes Linux audit and logging architecture, Active Directory and LDAP, NIST publications, application hardening with code-scanning tools such as Coverity or Fortify, eMass or Xacta, and DoD deployment logistics, acquisition processes, exercise planning, data links, or edge computing.

Responsibilities:

• We participate in risk and vulnerability assessments of information systems to identify weaknesses, threats, and protection requirements.
• We coordinate the development of Security Impact Assessments for proposed system changes.
• We combine software and hardware engineering knowledge to support secure system delivery.
• We prepare and present technical findings in internal and external program meetings.
• We develop, monitor, and report technical metrics.
• We manage requirements in DOORS or JIRA throughout the project lifecycle.
• We communicate across and outside the organization to help leadership adopt new practices and approaches.
• We track A&A status for assigned systems and oversee accreditation and re-accreditation actions.
• We improve existing processes or establish new ones where needed.
• We work cross-functionally to ensure security requirements are addressed throughout the mission system development lifecycle.
• We perform security compliance scans, vulnerability analysis, and drive remediation of identified issues.
• We conduct periodic network vulnerability scans and recommend remediation options while ensuring compliance with corporate security policies and best practices.
• We develop and maintain ATO Body of Evidence artifacts.
• We work fully on-site, as this role cannot be performed remotely.

Company:

We are L3Harris, a trusted disruptor in defense technology, delivering end-to-end solutions across the space, air, land, sea, and cyber domains in support of national security. We foster an inclusive, engaging environment that supports professional growth, employee well-being, and work-life success. This Senior Specialist, Systems Engineer - Information Security role is based in Greenville, Texas and follows a 9/80 schedule, giving our employees every other Friday off. We are proud to be an equal opportunity employer, maintain a drug-free workplace, and support a security-focused hiring process that may include background checks and clearance eligibility screening.