Senior ISSO - Cloud Security, ATO Lead, Zero Trust

Base-2 Solutions, LLC.; Washington (District of Columbia); On-site; USD 140,000 - 210,000; Full time

Job summary

Base-2 Solutions, LLC. seeks a Senior Information Systems Security Officer (ISSO) in the Washington, DC area to shape and enhance cybersecurity initiatives across programs. You will lead security assessments, drive ATO activities, and ensure compliance with NIST guidelines while coordinating with ISSMs, AO, and development teams.

The role requires active TS/SCI with CI Poly, U.S. citizenship, and hands-on experience with XACTA, RMF processes, and security artifacts (SSPs, POA&Ms).

Qualifications

• Active Security+ or equivalent IAT II/III cert
• Experience with XACTA and RMF, including IATT/ATO
• Experience building and maintaining security artifacts (SSPs, SAPs, POA&M)
• Experience assessing IT architectures for security compliance (e.g., ICD 503)
• Strong ability to coordinate with ISSMs, ISSEs, owners, and AO

Responsibilities

• Conduct technical security assessments and contribute to the security Systems.
• Ensure system security compliance, manage risks, and support certification activities through the program life cycle.
• Collaborate with application leads, sysadmins, dbas, developers and testers to ensure security compliance and ATO.
• Answer questions to ensure systems are developed with security compliance built in.
• Support security assessment events and respond to questions from ISSMs and SCAs.
• Develop and maintain SSPs, POA&Ms, and security documentation using XACTA.
• Drive IATT and ATO efforts, coordinating with stakeholders, cyber, and AO.
• Implement and validate NIST 800-53 controls in cloud-native DPaaS environments.
• Apply Zero Trust principles to secure data services, including identity, segmentation, and flow control.

Skills

Security+ or IAT II/III cert

Cybersecurity initiative leadership

Stakeholder communication

Education

Bachelor's degree substitution rules (4 years) for BA/BS; Master for 6 years

Tools

XACTA

RMF process

Splunk

Job description

Base-2 Solutions, LLC. seeks a Senior Information Systems Security Officer (ISSO) in the Washington, DC area to shape and enhance cybersecurity initiatives across programs. You will lead security assessments, drive ATO activities, and ensure compliance with NIST guidelines while coordinating with ISSMs, AO, and development teams.

The role requires active TS/SCI with CI Poly, U.S. citizenship, and hands-on experience with XACTA, RMF processes, and security artifacts (SSPs, POA&Ms).