Job Description A defense client is seeking a Linux System Admin to support secure, mission-critical infrastructure within a classified environment. This individual will administer and optimize Red Hat Enterprise Linux (RHEL) systems, implement infrastructure automation through tools such as Ansible, perform system hardening and STIG compliance activities, and support the deployment and maintenance of secure computing environments. Responsibilities include monitoring system health, installing and maintaining monitoring agents, troubleshooting infrastructure issues, managing system configurations, and ensuring systems meet strict cybersecurity, availability, and resilience requirements. Skills and Requirements Active Secret or TS/SCI Clearance4-7 years of Systems Administration and/or Systems Engineering experienceRed Hat Enterprise Linux (RHEL) administrationExperience hardening systems and applying STIGsSystem monitoring, troubleshooting, and performance optimizationSecurity+ CE, CCNA Security, or higher certificationExperience with virtualization technologiesExperience with backup and disaster recovery solutionsPrevious DoD and/or Intelligence Community (IC) experienceAWS administration experience (EC2, S3, IAM, VPC, RDS, CloudWatch, Lambda)Terraform, CloudFormation, and/or AnsibleAWS AMI creation, security, and maintenanceCI/CD pipeline experienceBuild automation and automated testing frameworks We are a company committed to creating diverse and inclusive environments where people can bring their full, authentic selves to work every day. We are an equal employment opportunity/affirmative action employer that believes everyone matters. Qualified candidates will receive consideration for employment without regard to race, color, ethnicity, religion, sex (including pregnancy), sexual orientation, gender identity and expression, marital status, national origin, ancestry, genetic factors, age, disability, protected veteran status, military or uniformed service member status, or any other status or characteristic protected by applicable laws, regulations, and ordinances. If you need assistance and/or a reasonable accommodation due to a disability during the application or the recruiting process, please send a request to HR@insightglobal.com.