Cloud Security Administrator - RHEL

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

Benefits offered by this job

Health and Wellness programs

Paid Leave and Retirement

Competitive compensation

Job summary

Leidos is seeking a Cloud Security Administrator to protect AWS cloud environments for the CSSP. The role requires senior-level RHEL administration to support RMF/ATO and continuous monitoring across enterprise environments.

You will manage security controls (IAM, CloudTrail, CloudWatch, Security Hub, GuardDuty, KMS, VPC) and coordinate vulnerability remediation. The position is in Adelphi, MD, hybrid with 3 onsite days per week.

Qualifications

• 8+ years of relevant experience with a Bachelor's or 4+ years with a Master's in a related field.
• Hands-on experience administering security controls in AWS or other enterprise cloud environments.
• Experience with AWS security services: IAM, CloudTrail, CloudWatch, Security Hub, GuardDuty, KMS, and VPC controls.
• Experience with vulnerability management, compliance monitoring, patching, and remediation tracking.
• Hands-on RHEL administration in production/enterprise environments.
• Experience with Ansible for automation and DoD RMF/ATO, NIST SP 800-53, DISA STIG/SRG knowledge.
• Experience with SIEM, endpoint security, and enterprise logging.

Responsibilities

• Administer, monitor, and maintain cloud security controls across AWS 2.0 and CSSP subscriber environments.
• Diagnose and resolve Linux OS, service, storage, networking, authentication, and application issues.
• Identify, coordinate remediation of cloud vulnerabilities and misconfigurations.
• Manage AWS security tooling: IAM, CloudTrail, CloudWatch, Security Hub, GuardDuty, KMS, and VPC controls.
• Support RMF, ATO, and continuous monitoring with assessments and documentation.
• Conduct security configuration reviews across AWS resources and Linux/Windows systems.
• Onboard CSSP subscribers to centralized logging, vulnerability management, and Elastic Defender services.
• Coordinate patching, access reviews, change management, and incident response.
• Develop and maintain security runbooks and compliance evidence.

Skills

RHEL administration

Cloud security

Vulnerability management

RMF/ATO understanding

DoD 8140 knowledge

Documentation

Education

Bachelor's degree

Tools

AWS IAM

AWS CloudTrail

AWS CloudWatch

AWS Security Hub

GuardDuty

KMS

VPC security controls

Ansible

RMF tooling

Tenable.sc/ACAS

Elastic Security

Elastic Agent Defend

Job description

Description

Help secure mission-critical cloud environments supporting our nation's cyber defense.

Leidos is seeking a Cloud Security Administrator with senior-level RHEL administration experience to support the U.S. Army C5ISR Cyber Security Service Provider (CSSP). In this role, you'll help secure and sustain AWS cloud environments by managing security controls, identifying vulnerabilities, coordinating remediation, and supporting continuous compliance monitoring.

You’ll collaborate with cloud engineers, cybersecurity specialists, and mission partners to strengthen cloud security, streamline remediation, and maintain operational readiness across enterprise environments.

If you’re passionate about AWS security, vulnerability management, and protecting critical defense infrastructure in RHEL environment, this is an opportunity to apply your expertise to a mission that matters.

Location: Adelphi, MD | Hybrid (3 Days Onsite)

Clearance: U.S. citizenship with an active Secret Required | TS/SCI Required for Position

Primary Responsibilities

• Administer, monitor, and maintain cloud security controls across AWS 2.0 and CSSP subscriber environments.
• Ability to 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 Risk Management Framework (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.

Basic Qualifications

• Bachelor's degree with 8+ years of relevant experience or master's degree with 4+ years of relevant experience. Additional relevant experience may be considered in lieu of a degree.
• Hands-on experience administering security controls in AWS or other enterprise cloud environments.
• Working knowledge of AWS security services, including IAM, CloudTrail, CloudWatch, Security Hub, GuardDuty, Systems Manager, KMS, and VPC security controls.
• Experience with vulnerability management, security assessments, compliance monitoring, patch management, and remediation tracking.
• Demonstrated hands-on experience administering Red Hat Enterprise Linux (RHEL) systems in production or enterprise environments.
• Familiarity with Linux and Windows security administration, including host-level and cloud security findings.
• Experience using Ansible to automate routine system-administration tasks, such as configuration changes, account management, and compliance remediation.
• Understanding of DoD cybersecurity requirements, RMF/ATO, NIST SP 800-53, and DISA STIG/SRG standards.
• Experience with SIEM, endpoint security, enterprise logging, security monitoring, and ticketing platforms.
• Strong analytical, troubleshooting, documentation, and communication skills.
• Ability to meet applicable DoD 8140 qualification requirements at start and obtain required CSSP and Computing Environment certifications within 90 days, as applicable to the assigned work role.
• U.S. Citizenship with an active Secret security clearance required at start, with TS/SCI required for the position, subject to program access and eligibility requirements.

Preferred Qualifications

• Experience securing DoD cloud environments, including AWS GovCloud, IL4/IL5/IL6, Cloud One, or ECMA.
• Hands-on experience with Tenable.sc/ACAS, Elastic Security, Elastic Agent Defend, AWS Security Hub, or GuardDuty.
• Experience supporting RMF authorization packages, ATO assessments, and continuous-monitoring compliance activities.
• DoD 8140-aligned certification, such as CISSP, or equivalent certification appropriate to the assigned work role.
• AWS cloud or security certification and familiarity with scripting, automation, or infrastructure as code.

If you’re looking for comfort, keep scrolling. At Leidos, we outthink, outbuild, and outpace the status quo - because the mission demands it. We’re not hiring followers. We’re recruiting the ones who disrupt, provoke, and refuse to fail. Step 10 is ancient history. We’re already at step 30 - and moving faster than anyone else dares.

Original Posting:

November 6, 2026

For U.S. Positions: While subject to change based on business needs, Leidos reasonably anticipates that this job requisition will remain open for at least 3 days with an anticipated close date of no earlier than 3 days after the original posting date as listed above.

Pay Range:

Pay Range $107,900.00 - $195,050.00

The Leidos pay range for this job level is a general guideline only and not a guarantee of compensation or salary. Additional factors considered in extending an offer include (but are not limited to) responsibilities of the job, education, experience, knowledge, skills, and abilities, as well as internal equity, alignment with market data, applicable bargaining agreement (if any), or other law.

About Leidos

Leidos is an industry and technology leader serving government and commercial customers with smarter, more efficient digital and mission innovations. Headquartered in Reston, Virginia, with 47,000 global employees, Leidos reported annual revenues of approximately $16.7 billion for the fiscal year ended January 3, 2025. For more information, visit www.Leidos.com.

Pay and Benefits

Pay and benefits are fundamental to any career decision. That's why we craft compensation packages that reflect the importance of the work we do for our customers.

• competitive compensation
• Health and Wellness programs
• Income Protection
• Paid Leave and Retirement

More details are available at www.leidos.com/careers/pay-benefits.

Securing Your Data

Beware of fake employment opportunities using Leidos' name. Leidos will never ask you to provide payment-related information during any part of the employment application process (i.e., ask you for money), nor will Leidos ever advance money as part of the hiring process (i.e., send you a check or money order before doing any work). Further, Leidos will only communicate with you through emails that are generated by the Leidos.com automated system - never from free commercial services (e.g., Gmail, Yahoo, Hotmail) or via WhatsApp, Telegram, etc. If you received an email purporting to be from Leidos that asks for payment-related information or any other personal information (e.g., about you or your previous employer), and you are concerned about its legitimacy, please make us aware immediately by emailing us at [e-mail].

If you believe you are the victim of a scam, contact your local law enforcement and report the incident to the U.S. Federal Trade Commission.

Commitment to Non-Discrimination

All qualified applicants will receive consideration for employment without regard to sex, race, ethnicity, age, national origin, citizenship, religion, physical or mental disability, medical condition, genetic information, pregnancy, family structure, marital status, ancestry, domestic partner status, sexual orientation, gender identity or expression, veteran or military status, or any other basis prohibited by law. Leidos will also consider for employment qualified applicants with criminal histories consistent with relevant laws.