Senior Federal ISSO - RMF/ATO Leader (Remote)

Apex Systems; Oxon Hill (MD); Remote; USD 140,000 - 175,000; Full time

Benefits offered by this job

Medical, dental, vision

401K with company match

ESPP and HSA

Job summary

Everforth Apex Systems seeks a Senior ISSO to drive RMF lifecycle and ATO management for a federal cybersecurity program. The role emphasizes remediation, stabilization, and a future move toward automation across ~90 systems.

You will advise senior leadership, coordinate with PMOs, and ensure compliance with federal standards. The ideal candidate has 15+ years in information security, strong RMF/NIST knowledge, and experience leading security programs in federal environments.

Qualifications

• Bachelor's degree and 15+ years of relevant experience; or Associate's degree and 17+ years of relevant experience; or 21+ years of relevant experience in lieu of a degree.
• Deep expertise in RMF lifecycle and ATO process.
• Strong knowledge of FISMA, NIST 800-37/800-53, and DHS 4300 Series requirements.

Responsibilities

• Lead the full RMF lifecycle and ATO process end-to-end.
• Develop and maintain SSPs, POA&Ms, CM Plans, Contingency Plans, and Incident Response Plans.
• Serve as the primary cybersecurity lead for system owners, PMOs, and senior leadership.
• Conduct risk assessments, annual security assessments, and continuous monitoring activities.
• Manage POA&Ms remediation planning, audit findings, and compliance tracking.
• Perform Security Impact Analyses and review change requests.
• Develop authorization boundary diagrams, security architectures, and traceability matrices.
• Support security audits, compliance reviews, and accreditation efforts.

Skills

RMF lifecycle

ATO process

FISMA/NIST 800-37/800-53

Security risk assessments

Executive risk briefs

Education

Bachelor's degree or equivalent experience

Tools

CSAM

RegScale

eMASS

Job description

Everforth Apex Systems seeks a Senior ISSO to drive RMF lifecycle and ATO management for a federal cybersecurity program. The role emphasizes remediation, stabilization, and a future move toward automation across ~90 systems.

You will advise senior leadership, coordinate with PMOs, and ensure compliance with federal standards. The ideal candidate has 15+ years in information security, strong RMF/NIST knowledge, and experience leading security programs in federal environments.