Senior Information System Security Officer (ISSO)

Overview

Remote
$64 - $68
Contract - W2
Contract - 5 Year(s)
No Travel Required

Skills

CISSP
CISM
CISA
Cyber Security
Continuous Monitoring
FedRAMP
HBSS
ICAM
Mentorship
Documentation
FISMA
RMF
Risk Management Framework
Risk Assessment
Regulatory Compliance
Vulnerability Scanning
XACTA
eMASS
STIG
Testing
NIST SP 800 Series
EMC RSA Archer
Splunk

Job Details

Position Title: Senior Information System Security Officer (ISSO) Federal Modernization

End Client: US Coast Guard

Location: Washington, DC (100% remote)

Clearance Requirements: Unclassified (U.S. Citizenship required for future Secret clearance eligibility)

Position Status: Full Time, Long-Term-Contract

Pay Rate: W-2 $64 $68/hr., commensurate with experience and location

Position Description:
Join a federal IT modernization and sustainment program supporting mission-critical systems. As the Senior ISSO, you will lead cybersecurity strategy across the full SDLC embedding security into cloud migrations, microservices, and ongoing operations while maintaining continuous compliance with federal standards. You ll own ATO packages, drive continuous monitoring, and partner with engineering and program leadership to ensure secure, compliant, and resilient platforms.

What you ll do (key responsibilities):

  • Serve as security lead for assigned systems through design, modernization, deployment, and sustainment.
  • Own and maintain ATO packages (SSP, SAR, POA&M) and Continuous Monitoring reports.
  • Embed security in upgrades, containerized services, and cloud adoption (AWS GovCloud/Azure Government).
  • Perform vulnerability scanning, risk assessments, and plan/track remediation.
  • Ensure compliance with RMF, NIST SP 800-53, FISMA, DHS 4300A, CNSSI 1253, and DoD STIGs.
  • Lead audit readiness; coordinate responses to internal/external assessments.
  • Partner with architects, developers, and operations to validate controls and secure data flows.
  • Mentor junior cyber staff and act as liaison to program leadership and government security stakeholders.

Day-to-day (examples):

  • Review security logs, vulnerability results, and compliance dashboards; escalate risks with recommended fixes.
  • Update SSPs/POA&Ms; verify control implementations and configuration baselines (STIG/CIS).
  • Validate end-to-end workflows after changes (e.g., new services, integrations) and track findings to closure.
  • Provide concise security posture reports for leadership and participate in program stand-ups.

Required Skills/Education:

  • 10+ years of IT/cybersecurity experience with 5+ years as an ISSO (or equivalent).
  • Deep knowledge of RMF, NIST SP 800-53, FISMA, DHS 4300A, CNSSI 1253, DoD STIGs.
  • Hands-on with security/monitoring tools such as Tenable/Nessus, ACAS, Splunk, HBSS/EDR (or similar).
  • Experience preparing/maintaining ATO artifacts and running ConMon in production environments.

Nice to Have (boosters):

  • Familiarity with cloud modernization (AWS/Azure), containers/Kubernetes/OpenShift, and DevSecOps concepts.
  • FedRAMP, eMASS/Xacta/Archer/CSAM experience; Zero Trust/ICAM; IaC & container security (SAST/DAST/SCA/SCAP); audit leadership for large/complex systems; automation mindset and AI-assisted documentation/testing.
  • CISSP, CAP, CISM, or CISA strongly preferred.
  • S. Citizenship. Bachelor s degree in a related field (or equivalent practical experience) is preferred.

SEO keywords to aid discovery: Senior ISSO, Information Systems Security Officer, RMF, NIST 800-53, FISMA, ATO, POA&M, SSP, Continuous Monitoring, DHS 4300A, CNSSI 1253, DoD STIG, Tenable, Nessus, ACAS, Splunk, HBSS, FedRAMP, AWS GovCloud, Azure Government, Kubernetes, DevSecOps, eMASS, Xacta.

About Seneca Resources

At Seneca Resources, we are more than just a staffing and consulting firm, we are a trusted career partner. With offices across the U.S. and clients ranging from Fortune 500 companies to government organizations, we provide opportunities that help professionals grow their careers while making an impact.
When you work with Seneca, you re choosing a company that invests in your success, celebrates your achievements, and connects you to meaningful work with leading organizations nationwide. We take the time to understand your goals and match you with roles that align with your skills and career path. Our consultants and contractors enjoy competitive pay, comprehensive health, dental, and vision coverage, 401(k) retirement plans, and the support of a dedicated team who will advocate for you every step of the way.
Seneca Resources is proud to be an Equal Opportunity Employer, committed to fostering a diverse and inclusive workplace where all qualified individuals are encouraged to apply.

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