Senior Information Systems Security Representative – Technical Lead

Guidehouse

Senior Information Systems Security Representative leading security compliance efforts for major federal mission. Collaborating with technical teams to ensure continuous compliance and risk management.

Posted 5/10/2026full-timeArlington • Virginia, Washington • 🇺🇸 United StatesSenior💰 $113,000 - $188,000 per yearWebsite

Tech Stack

Tools & technologies

Cyber Security

About the role

Key responsibilities & impact

Ensure controlled systems operate in accordance with approved SAA/ATO requirements and agency security policies
Lead and manage the SAA process for new systems, legacy systems onboarding, and systems migrating into the governance, risk, and compliance (GRC) platform
Guide system owners on baseline security controls, system categorization, impact levels, and authorization boundary definition
Provide recommendations to the Authorizing Official on classification decisions, boundary updates, and risk posture
Oversee creation and maintenance of system entries within the GRC tool, ensuring categorizations and metadata remain current
Initiate, coordinate, and recommend ISAs, MOUs, and MOAs required for interconnections between controlled systems and external partners
Conduct independent reviews of System Security Plans (SSPs), ensuring accuracy, completeness, and alignment with federal requirements
Determine appropriate assessment levels and coordinate testing activities with assessment teams and Authorizing Officials
Schedule and support security control assessments, inspections, and system reviews in partnership with system owners and assessors
Compile and submit complete SAA/ATO packages for executive authorization decisions
Track and ensure serialization of ATO documentation within agency tracking systems (e.g., Sentinel)
Advise Authorizing Officials on vulnerabilities, residual risks, and recommended risk acceptance or remediation actions
Oversee POA&M management to ensure remediation actions are tracked, completed, and re‑tested
Coordinate event‑driven reauthorization activities when major system changes or incidents occur
Support the decommissioning and secure retirement of controlled systems in collaboration with ISSOs, ISSEs, and system owners

Requirements

What you’ll need

Bachelor’s degree in Cybersecurity, Information Systems, Computer Engineering, or related technical field
Minimum of TEN (10) years of professional IT or cybersecurity experience, including substantial senior‑level responsibilities
Minimum of SEVEN (7) years of direct ISSR or A&A/SAA experience supporting cleared federal environments
An ACTIVE and CURRENT TOP SECRET federal or DOD security clearance
Strong understanding of security frameworks and compliance standards (e.g., NIST, RMF SP 800-53 Rev 5, DoD 8570)
Demonstrated leadership in RMF lifecycle execution, SAA/ATO process management, and security governance
In‑depth knowledge of NIST guidance, security authorization processes, and federal cybersecurity compliance frameworks
Proven ability to work with Authorizing Officials, senior stakeholders, and diverse technical teams
Strong analytical, documentation, communication, and mentoring skills
Demonstrated ability to lead cross-functional teams and complex technical projects
Strong analytical and problem-solving skills
Excellent communication skills with the ability to convey technical concepts to non-technical stakeholders.

Benefits

Comp & perks

Medical, Rx, Dental & Vision Insurance
Personal and Family Sick Time & Company Paid Holidays
Parental Leave
401(k) Retirement Plan
Group Term Life and Travel Assistance
Voluntary Life and AD&D Insurance
Health Savings Account, Health Care & Dependent Care Flexible Spending Accounts
Transit and Parking Commuter Benefits
Short-Term & Long-Term Disability
Tuition Reimbursement, Personal Development, Certifications & Learning Opportunities
Employee Referral Program
Corporate Sponsored Events & Community Outreach
Care.com annual membership
Employee Assistance Program
Supplemental Benefits via Corestream (Critical Care, Hospital Indemnity, Accident Insurance, Legal Assistance and ID theft protection, etc.)
Position may be eligible for a discretionary variable incentive bonus

ATS Keywords

✓ Tailor your resume

Applicant Tracking System Keywords

Tip: use these terms in your resume and cover letter to boost ATS matches.

Hard Skills & Tools

SAAATOGRCSystem Security Plans (SSPs)POA&M managementNISTRMF SP 800-53 Rev 5DoD 8570security frameworkscybersecurity compliance

Soft Skills

leadershipanalytical skillsdocumentation skillscommunication skillsmentoring skillsproblem-solving skillscross-functional team leadershipstakeholder engagementproject managementtechnical concept communication

Certifications

TOP SECRET security clearance