Senior Cloud Security Administrator - AWS & DoD RMF

Leidos; Adelphi (MD); Hybrid; USD 108,000 - 195,000; Full time

Job summary

Leidos is seeking a Cloud Security Administrator to secure mission-critical cloud environments and support the U.S. Army CSSP. The role requires senior RHEL admin experience, familiarity with AWS security services, and DoD RMF/ATO processes.

Hybrid onsite in Adelphi, MD with active clearance requirements. You’ll manage cloud security controls, perform vulnerability remediation, and coordinate security operations across Linux and Windows, contributing to continuous compliance and secure mission

Qualifications

• 8+ years of relevant experience or 4+ with master’s degree.
• Hands-on experience administering security controls in AWS or other enterprise cloud environments.
• Experience with RMF/ATO, NIST SP800-53, DISA STIG/SRG.
• Experience with vulnerability management and remediation tracking.
• Proficient in Linux security administration (RHEL) in production.
• Experience with Ansible for automation.

Responsibilities

• Administer, monitor, and maintain cloud security controls across AWS 2.0 and CSSP subscriber environments.
• Diagnose and resolve Linux operating-system, service, storage, networking, authentication, and application issues.
• Identify, assess, track, and coordinate remediation of cloud vulnerabilities, misconfigurations, and compliance findings.
• Manage AWS security capabilities, including IAM, CloudTrail, CloudWatch, Security Hub, GuardDuty, KMS, and VPC security controls.
• Support RMF, Authorization to Operate (ATO), and continuous monitoring through security assessments, control validation, and compliance documentation.
• Conduct security configuration reviews across AWS resources, Linux and Windows systems, and supporting cloud infrastructure.
• Support onboarding of CSSP subscribers into centralized logging, vulnerability management, Elastic Agent Defend, and other security services.
• Coordinate security patching, access reviews, change management, incident response, and ongoing security operations.
• Develop and maintain security procedures, operational runbooks, compliance evidence, and technical documentation.

Skills

AWS security

RHEL administration

Ansible automation

Vulnerability management

Security monitoring

Education

Bachelor's degree

Master's degree

Tools

Tenable.sc

Elastic Agent Defend

GuardDuty

Job description

Leidos is seeking a Cloud Security Administrator to secure mission-critical cloud environments and support the U.S. Army CSSP. The role requires senior RHEL admin experience, familiarity with AWS security services, and DoD RMF/ATO processes.

Hybrid onsite in Adelphi, MD with active clearance requirements. You’ll manage cloud security controls, perform vulnerability remediation, and coordinate security operations across Linux and Windows, contributing to continuous compliance and secure mission