Senior Specialist, Information Security Systems Engineer (ISSE)

L3Harris Technologies; Palm Bay (FL); On-site; USD 110,000 - 150,000; Full time

Job summary

L3Harris is seeking an experienced Information Security Systems Engineer (ISSE) to join the Palm Bay team, focusing on secure designs and RMF-based authorization. You will ensure systems meet security, compliance, and mission requirements across environments, and prepare ATO documentation to support security authorizations.

The role requires TS/SCI with CI Poly, IAT II within 3 months, and experience strengthening secure systems throughout the lifecycle.

Qualifications

• Bachelor’s degree with 6+ years of relevant experience; graduate degree with 4+ years; or 10 years without degree.
• Active TS/SCI clearance with CI Poly is required.
• IAT Level II minimum within 3 months of start (Security+ CE, CCNA Security, or equivalent).
• Security certifications such as Security+ or CISSP are preferred.

Responsibilities

• Prepare and manage RMF-based ATO documentation to achieve security authorization.
• Design, integrate, and maintain secure on-premises architectures.
• Apply cybersecurity principles across the system development lifecycle.
• Analyze requirements to derive security controls and technical solutions.
• Perform security assessments, gap analyses, and risk evaluations.
• Identify vulnerabilities and support remediation efforts across disciplines.
• Support audits and customer assessments with technical evidence.
• Communicate risks and recommendations to technical and non-technical stakeholders.

Skills

Active TS/SCI clearance

IAT Level II

Security+ or CISSP

DevSecOps familiarity

Education

Bachelor’s Degree with 6+ years of relevant experience; Graduate Degree with 4+ years; or 10 years without degree

Tools

RMF / NIST RMF

Job description

L3Harris is dedicated to recruiting and developing high-performing talent who are passionate about what they do. Our employees are unified in a shared dedication to our customers’ mission and quest for professional growth. L3Harris provides an inclusive, engaging environment designed to empower employees and promote work-life success. Fundamental to our culture is an unwavering focus on values, dedication to our communities, and commitment to excellence in everything we do.

L3Harris is the Trusted Disruptor in defense tech. With customers’ mission-critical needs always in mind, our employees deliver end-to-end technology solutions connecting the space, air, land, sea and cyber domains in the interest of national security.

Job Title: Senior Specialist, Information Security Systems Engineering (ISSE)

Job Code: 41354

Job Location: Palm Bay, FL

Job Schedule: 9/80: Employees work 9 out of every 14 days – totaling 80 hours worked, and have every other Friday off

Job Description

L3Harris is looking for an experienced Information Security Systems Engineer (ISSE) to join the Engineering team in Palm Bay, FL supporting the design, implementation, and sustainment of secure information systems across enterprise and program environments. This role is responsible for applying cybersecurity engineering principles throughout the system lifecycle, helping ensure systems meet security, compliance, and mission requirements. The ideal candidate will be able to prepare and manage the Assessment & Authorization documentation using NIST Risk Management Framework (RMF) to achieve system Authorization to Operate (ATO).

Essential Functions

• Prepare and manage Assessment and Authorization documentation using RMF and derivative processes (e.g., DOD 8510, JSIG, ICD-503, CNSSI 1253) to achieve security authorization of supported systems.
• Support the design, integration, and maintenance of secure system architectures for on-premises environments.
• Apply cybersecurity principles and security-by-design practices throughout the system development lifecycle.
• Analyze system requirements and derive security requirements, controls, and technical solutions.
• Perform security assessments, gap analyses, and risk evaluations for information systems and supporting infrastructure.
• Perform research required to identify vulnerability details and solutions to assist other cyber disciplines with their correction or mitigation.
• Support implementation and validation of security controls in alignment with applicable regulatory, contractual, and organizational requirements.
• Participate in Linux & Windows system hardening, secure configuration, patch management, and vulnerability remediation activities.
• Contribute to development of policies, standards, procedures, and technical documentation related to information security engineering.
• Support audits, inspections, and customer assessments by providing technical evidence and responses.
• Communicate technical risks, findings, and recommendations to both technical and non-technical stakeholders.

Qualifications

• Bachelor’s Degree and minimum 6 years of prior relevant experience. Graduate Degree and a minimum of 4 years of prior related experience. In lieu of a degree, minimum of 10 years of prior related experience.
• Active clearance: TS/SCI w/CI Poly.
• Must have or be able to obtain and maintain IAT Level II minimum (Security+ CE, CCNA Security, or equivalent) within 3-months of start.

Preferred Additional Skills

• Familiarity with emerging technologies such as cloud computing, containerization, and microservices, and their security implications (e.g. Understanding of security control inheritance in cloud-based systems.)
• Familiarity with STIG/SRG compliance validation and automated compliance scanning tools.
• Experience with security tools such as IDS/IPS, vulnerability scanners, and endpoint protection solutions.
• Professional certifications such as Security+, CISSP, or similar.
• Familiarity with DevSecOps practices, CI/CD pipeline security, and infrastructure as code security principles.
• Experience in regulated environments such as defense, aerospace, government contracting, or critical infrastructure.

L3Harris Technologies is proud to be an Equal Opportunity Employer. L3Harris is committed to treating all employees and applicants for employment with respect and dignity and maintaining a workplace that is free from unlawful discrimination. All applicants will be considered for employment without regard to race, color, religion, age, national origin, ancestry, ethnicity, gender (including pregnancy, childbirth, breastfeeding or other related medical conditions), gender identity, gender expression, sexual orientation, marital status, veteran status, disability, genetic information, citizenship status, characteristic or membership in any other group protected by federal, state or local laws. L3Harris maintains a drug-free workplace and performs pre-employment substance abuse testing and background checks, where permitted by law.

Please be aware many of our positions require the ability to obtain a security clearance. Security clearances may only be granted to U.S. citizens. In addition, applicants who accept a conditional offer of employment may be subject to government security investigation(s) and must meet eligibility requirements for access to classified information.

By submitting your resume for this position, you understand and agree that L3Harris Technologies may share your resume, as well as any other related personal information or documentation you provide, with its subsidiaries and affiliated companies for the purpose of considering you for other available positions.