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Senior Information System Security Officer - PLACEMENT

Job in Oxon Hill, Prince George's County, Maryland, 20745, USA
Listing for: Apex Systems
Full Time position
Listed on 2026-08-03
Job specializations:
  • IT/Tech
    Cybersecurity, Information Security & Data Protection
Salary/Wage Range or Industry Benchmark: 140000 - 180000 USD Yearly USD 140000.00 180000.00 YEAR
Job Description & How to Apply Below

Job#: 3041526

Job Description:

Position
:
Sr. ISSO x7 OPENINGS

Location
: FEMA St. Elizabeth Campus (SE DC) - Currently remote but must be comfortable coming on-site when needed

Duration
: 6 Month Contract to Hire (Brand New 5 Year Contract)

MUST HAVES:

  • Ability to obtain and maintain a DHS Public Trust up to a Top Secret Clearance
  • BS & 10 YOE OR AS & 13 YOE OR 16+ YOE
  • Experience manage RMF process and POA&Ms
  • Comfortable managing multiple systems at once and assisting with automating systems

Shift: Monday - Friday, 9 AM - 5 PM

7 OPENINGS: Sr. Level ISSO

Environment:

  • In discussions with the CISO, it was clear that the security program and systems have been neglected for at least a year, if not longer.
  • While documentation, artifacts, and security plans may exist, there is little confidence that they are current, complete, or in good condition.
  • The CISO's primary goal is to get the environment back on track and clean up existing security and compliance issues.
  • Focused on increasing automation wherever possible to improve efficiency and reduce manual effort.
  • The immediate focus is remediation and stabilization, with automation initiatives to follow once processes are back under control.
  • The environment consists of roughly 90 systems, although the exact number is unclear.
  • The team wants to move away from assigning ISSOs to individual systems and instead organize responsibilities by security control areas (e.g., Access Control, Configuration Management) across all systems.
  • Rather than owning a specific set of systems, ISSOs would be responsible for managing and monitoring their assigned control families enterprise-wide.
  • There is not a high level of confidence in the current patch management process and patching posture across the environment.

Skillset:

  • Senior ISSO with 10+ years of Information Security experience supporting federal systems
  • Deep expertise leading the full RMF lifecycle and ATO process end-to-end
  • Strong knowledge of FISMA, NIST 800-37, NIST 800-53, DHS 4300 Series, and federal cybersecurity requirements
  • Experience serving as the primary cybersecurity lead/advisor for system owners, PMOs, and senior leadership
  • Hands-on experience developing and maintaining SSPs, POA&Ms, Configuration Management Plans, Contingency Plans, and Incident Response Plans
  • Experience conducting risk assessments, annual security assessments, vulnerability assessments, and continuous monitoring activities
  • Ownership of POA&M management, remediation planning, audit findings, and compliance tracking
  • Experience performing Security Impact Analyses, change request reviews, and configuration management activities
  • Ability to develop and maintain authorization boundary diagrams, security architectures, and security requirement traceability matrices
  • Experience with security control implementation, self-assessments, control inheritance, and business impact analyses
  • Strong background supporting security audits, ATO packages, compliance reviews, and accreditation efforts
  • Experience developing remediation plans and advising stakeholders on cybersecurity risks and compliance requirements
  • Familiarity with CSAM, eMASS, Reg Scale, or similar GRC platforms
  • Knowledge of cloud security and FedRAMP authorization processes
  • Strong communication skills with the ability to brief executives, present risk findings, and work directly with senior leadership
  • Preferred experience supporting DHS, FEMA, DoD, or other federal agencies
  • CISSP, CISM, or CASP+ certification preferred (IAT Level III equivalent)

EEO Employer

Apex Systems is an equal opportunity employer. We do not discriminate or allow discrimination on the basis of race, color, religion, creed, sex (including pregnancy, childbirth, breastfeeding, or related medical conditions), age, sexual orientation, gender identity, national origin, ancestry, citizenship, genetic information, registered domestic partner status, marital status, disability, status as a crime victim, protected veteran status, political affiliation, union membership, or any other characteristic protected by law.

Apex will consider qualified applicants with criminal histories in a manner consistent with the requirements of applicable law.

  • Everforth Apex offers a range of supplemental benefits, including medical, dental, vision, life, disability, and other insurance plans that offer an optional layer of financial protection.
  • We offer an ESPP (employee stock purchase program) and a 401K program which allows you to contribute typically within 30 days of starting, with a company match after 12 months of tenure.
  • Everforth Apex also offers a HSA (Health Savings Account on the HDHP plan), a Support Linc Employee Assistance Program (EAP) with up to 8 free counseling sessions, a corporate discount savings program and other discounts.
  • In terms of professional development, Everforth Apex hosts an on-demand training program, provides access to certification prep and a library of technical and leadership courses/books/seminars once you have 6+ months of tenure, and certification discounts and…
Position Requirements
10+ Years work experience
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