ACAS Engineer

Location: Washington

Peraton Overview Peraton is a next-generation national security company that drives missions of consequence spanning the globe and extending to the farthest reaches of the galaxy. As the world’s leading mission capability integrator and transformative enterprise IT provider, we deliver trusted, highly differentiated solutions and technologies to protect our nation and allies. Peraton operates at the critical nexus between traditional and nontraditional threats across all domains: land, sea, space, air, and cyberspace.

The company serves as a valued partner to essential government agencies and supports every branch of the U.S. armed forces. Each day, our employees do the can’t be done by solving the most daunting challenges facing our customers. Visit  to learn how we’re keeping people around the world safe and secure.

Responsibilities

Position Overview We are seeking a qualified ACAS Engineer to support vulnerability management, security compliance, and continuous monitoring operations across classified government enterprise environments. The ideal candidate will possess hands-on experience administering the Defense Information Systems Agency (DISA) Assured Compliance Assessment Solution (ACAS), including Tenable Security Center and Nessus scanners, to identify, assess, validate, and report vulnerabilities across complex, segmented networks.

The ACAS Engineer will support enterprise security operations by maintaining scanning infrastructure, executing vulnerability and compliance assessments, analyzing scan results, validating findings, and providing actionable remediation guidance to system owners, information system security teams, and government leadership. This role requires a strong understanding of DISA security requirements, Risk Management Framework (RMF) processes, and classified network security operations.

Key Responsibilities Administer and maintain Tenable Security Center, including user access controls, repository configurations, scan zones, scanning policies, and enterprise vulnerability management operations.

Maintain, configure, monitor, and troubleshoot distributed Nessus scanner infrastructure.

Plan, configure, and execute network discovery, vulnerability, and compliance scans across classified and unclassified government information systems, as authorized.

Analyze ACAS scan results to identify security weaknesses, validate findings, investigate anomalies, and resolve false positives through technical verification and documented analysis.

Map identified vulnerabilities to applicable security requirements and provide system owners with clear, prioritized remediation recommendations, supporting evidence, and risk-based corrective actions.

Develop and maintain vulnerability and compliance dashboards, executive summaries, and technical reports for government leadership, cybersecurity stakeholders, and laboratory security teams.

Support ongoing security assessment activities by monitoring scan coverage, identifying assessment gaps, tracking remediation progress, and maintaining accurate vulnerability status information.

Coordinate with cybersecurity operations, system administrators, network engineers, and information system security personnel to resolve scanning issues and improve assessment effectiveness.

Maintain standard operating procedures, scan configurations, troubleshooting documentation, and operational metrics in accordance with contract requirements and government security policies.

Perform all duties in accordance with applicable government security policies, classification requirements, access restrictions, and approved system operating procedures.

Qualifications

Required Qualifications Minimum of 8 years with BS/BA;
Minimum of 6 years with MS/MA;
Minimum of 3 years…