Hiring: Sr Systems Security Engineer / Sr. Core Applications Administrator Company: Sierra Nevada Corporation Location: Lone Tree, CO Job Posted Time: 2026-09-10 12:32:32 Employment Type: Remote Target Skills & Keywords : Ansible, Apache, Bash, CATIA, CI/CD, CentOS, Change Management, Configuration Management, Defense Industry, Docker, GitHub, GitHub Enterprise, GitLab, GitLab CI, IAM, Integration Testing, Java, Jenkins, Jira, Kubernetes, Linux, Nginx, OpenShift, PostgreSQL, Program Management, Python, RBAC, REST, RHEL, Red Hat, Requirements Management, SAML, SAST, SCA, SOAP, SSL, Security Clearance, Shell, Systems Engineering, TLS About the job Experience: •8+ years of experience in IT security or a related field. •12 years of related experience is required. •5+ years of hands-on application administration experience in Linux/RHEL environments — including application installation, configuration, patching, and performance tuning in a production or program-of-record context. Required Skills: •Manage the full application lifecycle for critical engineering and DevOps platform applications — installation, configuration, patching, version upgrades, and retirement across RHEL/Linux environments. •Administer backend application server infrastructure including Apache Tomcat, JBoss/WildFly, or equivalent Java EE application servers — including heap tuning, connection pool management, and log configuration. •Manage frontend application delivery including web server configuration (Apache HTTPD, Nginx), reverse proxy setup, SSL/TLS certificate management, and load balancer integration. •Develop and maintain application configuration baselines — version-controlled configuration files, environment-specific parameter management, and configuration drift detection. •Execute application patching and update cycles in alignment with program change management processes — including pre-patch testing, rollback planning, and post-patch validation. •Monitor application health, performance, and availability using platform-specific monitoring tools and enterprise monitoring solutions — proactively identify and resolve performance degradation before it impacts users. •Administer Red Hat Enterprise Linux (RHEL) and/or CentOS/Rocky Linux environments supporting engineering application workloads — including system installation, hardening, user management, and package management (RPM/YUM/DNF). •Manage Linux system services, startup configurations (systemd), file system management, and storage mount points for application data and log directories. Qualifications: •Maintain application licensing compliance — track license utilization, manage license server configurations, and coordinate renewals and procurement with program management. Compensation: •$143,487 - $197,294 / year •Flexible work environment (work from home / hybrid options) Interested candidates, please apply directly through the job posting on company's career page or try via AI auto apply on this platform. Don't miss this opportunity to join a forward-thinking team!