Senior Specialist, Cyber Intelligence (ISSO)

L3Harris•Wilmington, MA

1d•Onsite

About The Position

L3Harris is seeking a highly skilled, experienced, and security-conscious ISSO to join our team in Wilmington, MA. The ideal candidate will have a strong background in Linux and Windows environments, with an emphasis on adhering to the Risk Management Framework (RMF). This role requires an active Top Secret clearance with SCI eligibility, and involves maintaining the integrity, confidentiality, and availability of classified information systems.

Requirements

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.
Minimum Security+ certification required in accordance with DoD 8570/8140.
Active Top-Secret Clearance with SCI Eligibility

Nice To Haves

10+ years of direct experience in cybersecurity, information assurance, and system accreditation in DoD environments.
Prior experience serving as Information System Security Manager (ISSM) or lead ISSO supporting multiple classified enclaves under DCSA oversight.
Experience with DAAG (formerly DAAPM), JSIG, and NIST RMF.
Experience leading and executing Risk Management Framework (RMF) activities for classified systems through all lifecycle phases—from system categorization through continuous monitoring.
Knowledge of Linux (Ubuntu, Red Hat) and Windows operating systems in mixed enclave environments, including patch automation, configuration hardening, and endpoint compliance.
Experienced in leading vulnerability management programs using ACAS/Nessus, SCAP, and STIG compliance tools, including interpreting and tracking POA&Ms for closure.
Experience with virtualization, containerization, and enclave segregation architectures supporting both legacy and emerging DoD systems.
Experience with toolsets such as Splunk, Tenable (Nessus), STIGViewer, SCAP, DISA Gold Disk/Secure Host Baseline (SHB), and SIEM platforms for compliance validation and log correlation.

Responsibilities

Serve as a technical lead for classified system security architecture, ensuring compliance with DCSA DAAG (formerly DAAPM), JSIG, and NIST RMF standards across multiple programs.
Oversee end-to-end system authorization processes—including security categorization, control implementation, validation, and continuous monitoring—to maintain active ATOs and alignment with enterprise cyber governance.
Develop and author advanced RMF documentation packages (SSP, SCTM, POA&M, RAR, etc.) and provide mentorship to ISSOs and System Administrators on control inheritance, risk acceptance, and test methodologies.
Lead vulnerability and compliance assessments leveraging Nessus, STIGViewer, SCAP, and coordinate with Engineering and Program Management to remediate findings and reduce enterprise risk.
Direct audit readiness and inspection efforts for DCSA and ensure all security evidence and technical artifacts meet DAAG (formerly DAAPM) and program standards.
Provide strategic security advisory support to ISSMs, FSOs, and Program Managers on architecture decisions, enclave segmentation, and classified lab operations.
Conduct advanced incident response coordination to ensure timely containment and recovery within the approved system boundary.
Drive the development and delivery of tailored cybersecurity awareness and privileged user training, reinforcing accountability and compliance across technical staff.
Maintain current knowledge of evolving cybersecurity threats, regulatory changes, and defense policy updates; proactively identify and mitigate gaps before they impact program operations.
Represent the Cyber Intelligence Team in cross-functional engineering reviews, change control boards (CCBs), and capital planning discussions as needed.