Information Systems Security Officer (ISSO)

This position is full time, on site in either Charleston, SC or Washington, DC metro area. Candidates must live in either of those areas as position is full time on site. This position requires the candidate have an Active Top Secret/Sensitive Compartmented Information (TS/SCI) clearance with the ability to obtain a Counterintelligence (CI) Polygraph.

Accelera Solutions is seeking an Information Systems Security Officer (ISSO) to support the authorization and ongoing security of mission applications, cloud infrastructure, and enterprise core services. The ISSO will work with Government security personnel, software developers, and infrastructure engineers to maintain security documentation, assess risk, and ensure systems meet applicable Department of Defense and Intelligence Community requirements.

This role requires someone who can connect security requirements to how systems are built and operated. Candidates should be comfortable reviewing technical evidence, investigating compliance gaps, and working with engineers to resolve findings as software, infrastructure, and system configurations change.

What You’ll Do:

*Support Risk Management Framework (RMF) activities to obtain and maintain Authority to Operate (ATO) for systems across applicable classification levels.
*Develop and maintain authorization documentation, including System Security Plans (SSPs), security control implementation statements, system boundary descriptions, and supporting evidence.
*Coordinate with system owners, Information System Security Managers (ISSMs), assessors, and engineering teams to prepare authorization packages and resolve assessment findings.
*Maintain Plans of Action and Milestones (POA&Ms), track remediation progress, and communicate unresolved risks and dependencies.
*Use the DISA Enterprise Mission Assurance Support Service (eMASS) to maintain authorization records, security control documentation, assessment evidence, and remediation status, as applicable.
*Review Assured Compliance Assessment Solution (ACAS) scan results, security configuration assessments, and application security testing reports; work with technical teams to prioritize and validate remediation.
*Assess the security impact of software releases, infrastructure changes, new integrations, and changes to the authorization boundary.
*Support continuous monitoring by maintaining current security evidence, reviewing control effectiveness, and reporting changes in system risk.
*Work with cloud and DevSecOps engineers to incorporate security requirements and evidence collection into development and deployment workflows.
*Review access controls, privileged access, audit logging, configuration baselines, and protection of sensitive data.
*Support security incident reporting, investigation, corrective actions, and updates to relevant documentation and procedures.
*Apply appropriate security overlays and support supply chain risk management activities.
*Prepare security status reports and brief Government stakeholders on authorization progress, findings, and remediation priorities.