ISSE Security Engineer: RMF/eMASS, Onsite San Diego

The Marlin Alliance, Inc.; San Diego (CA); On-site; USD 95,000 - 125,000; Full time

Job summary

The Marlin Alliance, Inc. is seeking an Information System Security Engineer (ISSE) to support a Navy client’s cybersecurity accreditation efforts in San Diego, CA.

The ISSE will own an eMASS package, drive interim authorization and contribute to RMF compliance, including STIG assessments and Microsoft 365 DDIL testing. The company emphasizes agile, solution-oriented work and seeks professionals with strong communication skills ready to deliver practical results.

Qualifications

• Bachelor's degree in Computer Science, Information Systems, or a related field.
• 3–5 years of experience in information systems security engineering or RMF/cybersecurity accreditation support.
• Active CISSP, CISM, CASP+, or CGRC certification (DoD 8140 / IAM Level II).
• Experience navigating eMASS workflows, managing POA&Ms, and preparing IATT/ATO artifacts.
• Knowledge of STIG assessment and remediation processes.
• Strong written and verbal communication skills.
• U.S. citizen with an active SECRET security clearance.

Responsibilities

• Serve as the primary point of accountability for an assigned eMASS package, ensuring accuracy and currency of all documentation.
• Lead and execute Interim Authorization to Test (IATT) extension activities to maintain testing authority.
• Develop, update, and maintain Plans of Action and Milestones (POA&Ms) in support of ongoing accreditation efforts.
• Conduct Security Technical Implementation Guide (STIG) assessments and coordinate remediation activities across relevant systems.
• Support Microsoft 365 DDIL testing from a security engineering perspective.
• Prepare and review authorization artifacts per RMF and DoD guidance.
• Coordinate with ISSMs and Authorizing Officials to support accreditation decisions.
• Monitor and report on security posture and track vulnerabilities to closure.
• Assist in development and maintenance of security control documentation.

Education

Bachelor's degree in Computer Science, Information Systems, or a related field

Master's degree in Computer Science, Information Systems, or a related field

Job description

The Marlin Alliance, Inc. is seeking an Information System Security Engineer (ISSE) to support a Navy client’s cybersecurity accreditation efforts in San Diego, CA.

The ISSE will own an eMASS package, drive interim authorization and contribute to RMF compliance, including STIG assessments and Microsoft 365 DDIL testing. The company emphasizes agile, solution-oriented work and seeks professionals with strong communication skills ready to deliver practical results.