Information System Security Officer (ISSO) with TS/SCI CI Poly Clearance Job at Maania Consultancy Services, Saint Louis, MO

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  • Maania Consultancy Services
  • Saint Louis, MO

Job Description

Responsibilities

  • Lead RMF/ICD-503 Assessment & Authorization (A&A) activities; coordinate with NGA DAOs/DAORs to achieve/maintain ATO.

  • Maintain security documentation (SSPs, POA&Ms, SIA/SIAs, CONOPS, ITDR) in Service+ (ServiceNow), XACTA/XACTA 360, and NPT/CIO tools.

  • Drive security changes via steering groups/review boards; track milestones and risk burn-down.

  • Perform/control testing of security controls; assess Zero Trust/defense-in-depth effectiveness and compliance with IC/DoD/NIST/DISA standards.

  • Operate the vulnerability management program across (U)/(S)/(TS) enclaves using Nessus and Tenable-ACAS; analyze results, prioritize fixes, verify mitigations, and manage POA&M status.

  • Advise lab and operations teams on secure SDLC, hardening (e.g., STIGs), and best practices; resolve complex security issues.

  • Address IA/cyber directives, vulnerability and patch tasking; document changes, upgrades, and connectivity configurations.

  • Provide user training; manage access provisioning and IAA (identification, authentication, authorization).

  • Collaborate with Systems Engineers/Admins, Senior ISSO/ISSMs, Lab Team, and Corporate Security to sustain an effective security posture.

Basic Qualifications

  • U.S. citizenship (per contract).

  • BS degree and 8–12 years of relevant ISSO/ cybersecurity experience.

  • Demonstrated application of ICD-503 and NIST RMF; familiarity with customer mission/security operations.

  • Experience with: XACTA (XACTA 360 preferred), HBSS, ACAS, Nessus, Splunk.

  • Strong written/verbal communication; ability to brief leadership and lead cross-functional efforts.

Preferred Qualifications

  • 3+ years operating/analyzing vulnerability scans (Nessus, Tenable Security Center or similar) with proven remediation outcomes.

  • Active CISSP or CISM.

  • Intelligence Community experience; knowledge of AWS/C2S and modern Zero Trust implementations.

Job Tags

Full time, Contract work,

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