Senior Security Controls Assessor – RMF & NIST Expert

ECS Corporate Services; Washington (District of Columbia); Hybrid; USD 150,000 - 168,000; Full time

Job summary

ECS Corporate Services is seeking a Security Controls Assessor to our Washington, DC hybrid office. The role supports a long‑term, full‑time contract with a U.S. Government civilian agency, performing risk and control assessments under RMF guidelines.

Applicants must hold an active security clearance and have extensive experience with NIST SP 800‑53, RMF, and federal information security requirements, with travel to CONUS and occasional OCONUS locations expected.

Qualifications

• Active Secret clearance required with eligibility to obtain Top Secret clearance.
• Minimum five (5) years of information security experience.
• Minimum three (3) years of experience supporting security assessment teams, including planning assessments.
• Two (2) years of experience using GRC tools.
• Experience conducting full-scope technical security control testing across components.
• Working knowledge of RMF Steps 1‑6.
• Strong understanding of NIST SP 800‑53, NIST CSF, and related laws/regulations.
• Ability to analyze configurations and specifications against NIST controls.
• Experience developing risk-based documentation.

Responsibilities

• Review and update information security policies, standards, and procedures per regulations.
• Perform independent security and privacy control assessments for the client CSO.
• Assess FISMA systems and communicate findings and impacts of control weaknesses.
• Review A&A packages including SSP, Risk Assessments, ISCP, CMP, and POA&Ms for completeness.
• Develop and maintain test cases for control-level testing across system components.
• Develop and execute security and privacy assessment plans per NIST SP 800‑53A.
• Document findings and actionable recommendations clearly.
• Analyze security tool outputs to distinguish residual risk from false positives.
• CONUS and OCONUS travel to conduct system assessments.

Skills

Security assessment

RMF

NIST SP 800-53

NIST CSF

GRC tools

Education

Bachelor's degree in Computer Science, MIS/IT, Engineering, Information Security/Assurance, or a related field

Tools

GRC tools

Job description

ECS Corporate Services is seeking a Security Controls Assessor to our Washington, DC hybrid office. The role supports a long‑term, full‑time contract with a U.S. Government civilian agency, performing risk and control assessments under RMF guidelines.

Applicants must hold an active security clearance and have extensive experience with NIST SP 800‑53, RMF, and federal information security requirements, with travel to CONUS and occasional OCONUS locations expected.