Systems Administrator - Vulnerability Mitigation

Leidos • Chantilly, VA

8d • $116,350 - $210,325

About The Position

Leidos Intelligence Group is seeking a Senior Systems Administrator to lead vulnerability remediation and system hardening activities in a primarily Windows-based enterprise environment. This role involves close coordination with the Information Security (INFOSEC) team for vulnerability identification and prioritization. The Senior Systems Administrator will research, validate, and implement remediation actions, assessing potential system impacts before deployment. This position is crucial for achieving and maintaining System Authorization to Operate (ATO) and ongoing accreditation efforts. While the role is Windows-heavy, familiarity with Linux systems and basic administration is beneficial. The ideal candidate is proactive, execution-focused, takes ownership, and drives remediation to completion with minimal oversight.

Requirements

• Must have a Top Secret/SCI w/Poly to be considered.
• Must have a Bachelor’s degree and at least 12 years of experience OR a Master’s degree and at least 10 years of prior relevant experience preferred OR 16 years of relevant career experience in lieu of degree.
• Client/Server experience.
• Linux and Windows experience.
• You will be required to pass both a customer required and administered medical and psychological screening, as a condition of employment.

Nice To Haves

• Familiarity with Linux systems and basic administration is beneficial.

Responsibilities

• Lead remediation of vulnerabilities based on direction and prioritization from the INFOSEC team.
• Research remediation options and assess potential system and operational impacts prior to implementation.
• Translate vulnerability findings into system-level fixes (patching, configuration changes, registry updates, etc.).
• Execute and guide remediation efforts across Windows systems, with support for Linux where applicable.
• Independently drive remediation efforts to completion and remove blockers as they arise.
• Track remediation progress and provide clear status reporting to stakeholders.
• Research, validate, and recommend hardening changes with full awareness of system and application dependencies.
• Implement and refine security configurations based on established baselines and INFOSEC guidance.
• Disable or restrict insecure protocols, ports, and services (e.g., SMBv1, legacy TLS).
• Configure and maintain secure cipher suites and encryption standards.
• Apply and interpret STIGs, CIS Benchmarks, or organizational hardening standards across Windows systems, with awareness of equivalent practices in Linux environments.
• Design, implement, and manage Group Policy Objects (GPOs) to enforce security settings.
• Evaluate and test policy changes to understand enterprise-wide impact prior to deployment.
• Support domain-level security configurations and account policies.
• Troubleshoot complex policy application issues and ensure consistent enforcement.
• Support and contribute to activities required to achieve and maintain Authorization to Operate (ATO) and system accreditation.
• Ensure systems meet remediation timelines aligned with accreditation and compliance requirements.
• Provide detailed evidence and documentation for patching, hardening, and remediation activities.
• Assist with audits, assessments, and validation of security controls.
• Partner with INFOSEC and Client/Server teams to coordinate and execute remediation efforts.
• Communicate implementation strategies, risks, and system impacts to technical stakeholders.
• Participate in Windows patching activities in coordination with the WUS team.
• Validate patch applicability and remediation impact prior to deployment.
• Support testing and post-deployment validation of Windows updates.
• Troubleshoot complex update issues in collaboration with WUS and server teams.
• Ensure systems meet patch compliance requirements as defined by organizational standards.

Benefits

• Diverse and talented people
• Innovative solutions
• Contribution to communities
• Sustainable operations
• Commitment to do the right thing for our customers, our people, and our community

What This Job Offers

• Job Type: Full-time
• Career Level: Senior