Security Control Assessor

Main Sail • Oak Ridge, TN

14h • Onsite

About The Position

Main Sail is seeking experienced Security Control Assessors to support cybersecurity and accreditation operations for a National Nuclear Security client located in Oak Ridge TN. Candidates must be a United States Citizen (no dual status) per contract requirements. The role involves implementing and maintaining security controls, supporting system authorization, monitoring security posture, and preparing systems for security assessments.

Requirements

• Level 3: Bachelor's Degree w/ 2-5 yrs responsibilities experience; or Associates Degree w/ 5-10 yrs experience.
• Level 4: Master's Degree w/ 2-5 yrs responsibilities experience; or Bachelor's Degree w/ 5-10 yrs experience; or Associates Degree w/ 10-15 yrs experience.
• Level 5: Master's Degree w/ 5-10 yrs responsibilities experience; or Bachelor's Degree w/ 10-15 yrs experience; or Associates Degree w/ 15-20 yrs experience.
• Firm understanding of NIST SP 800-37 and NIST SP 800-53.
• Requires current active DoE Q; or DoW TS.
• Must be a United States Citizen (no dual status).

Nice To Haves

• CNSSI 1253 experience a plus.

Responsibilities

• Implements and maintains security controls aligned with approved baselines and organizational requirements.
• Supports system authorization activities, including the development and maintenance of security documentation such as System Security Plans (SSPs) and Plans of Action and Milestones (POA&Ms).
• Monitors system security posture and identifies risks, vulnerabilities, and compliance gaps.
• Tracks and manages POA&Ms and coordinates remediation activities with system stakeholders.
• Assesses the security impact of system changes and supports configuration and change management processes.
• Supports continuous monitoring activities, including vulnerability management and security reporting.
• Serves as a security liaison between system teams, cybersecurity operations, and governance bodies.
• Prepares systems for security assessments, audits, and Authorizing Official reviews.

What This Job Offers

• Job Type: Full-time
• Career Level: Mid Level
• Education Level: Associate degree