Senior Information Systems Security Officer (ISSO)

REDLattice-posted 3 days ago

Full-time • Mid Level

Onsite • Chantilly, VA

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RedLattice is seeking a skilled Senior Information Systems Security Officer (ISSO). The ISSO provides system security support for ongoing and future system development within the customer organization. This role supports full life-cycle system security activities, including accreditation and authorization (A&A), risk management, and continuous monitoring. The ISSO serves as a key liaison between project teams, system owners, and accreditation authorities, ensuring compliance with customer security policies and requirements across multiple mission systems. This is a fully on-site position supporting mission-critical operations.

Support organization-wide activities to maintain A&A compliance for all systems across the full system life cycle
Collaborate closely with Information Systems Security Manager (ISSM) staff to manage accreditations and resolve security issues
Serve as the primary point of contact between project teams and the accreditation office
Review and assess network diagrams, system schematics, and security architectures
Analyze system vulnerability scans and work with project teams to remediate findings
Resolve inconsistencies and irregularities in A&A documentation submissions
Prepare assessment reports addressing organizational risk and ad-hoc customer requests involving policy interpretation and analysis
Manage software compliance, laptop certification, patch management, and continuous monitoring/scanning
Develop, maintain, and update System Security Plans (SSPs)
Generate and review the Body of Evidence (BOE) and supporting accreditation artifacts
Coordinate with SETA and development contractors throughout the A&A process
Maintain system security posture while supporting multiple concurrent projects

Bachelors degree in engineering, science, or a related technical discipline with 12+ years of relevant experience OR Masters degree with 10+ years of relevant experience OR PhD with 7+ years of relevant experience
Strong knowledge of Risk Management Framework (RMF) and Certification & Accreditation processes
Experience with system vulnerability scanning, remediation, and continuous monitoring
Proven background in patch management and security compliance across multiple domains
Ability to develop and implement continuous monitoring plans
Familiarity with cloud computing security concepts and cross-domain solutions
Working knowledge of digital communications and IT infrastructure technologies
Experience preparing and maintaining SSPs, BOE artifacts, and compliance documentation
Strong time management and multitasking abilities
Ability to support multiple projects simultaneously
Excellent written and verbal communication skills
Proactive, forward-leaning problem solver
Strong interpersonal skills with the ability to work independently and collaboratively
Demonstrated ability to quickly ramp up in customer environments
Active TS/SCI with a current polygraph

Prior experience as an ISSM, ISSO, or ISSE supporting the same customer
Previous direct experience working within the customer organization

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