Sr Systems Security Engineer

The ISR (Intelligence, Surveillance & Reconnaissance), Aviation, and Security (IAS) business area is a leader in ISR and aviation, it is a leading prime manned and unmanned aircraft systems integrator for innovative, high-performance ISR and aviation systems. Its end-to-end Command, Control, Computers, Communications and Intelligence, Surveillance & Reconnaissance (C4ISR) capabilities encompass design, integration, test, certification, ground/flight training and complete logistics support. IAS tailors solutions to customer cost, performance, and schedule requirements and designs to consistently exceed expectations – with an unrivaled record of on time and on (or under) budget deliveries. SNC has led thoughtful and disruptive change in the aerospace and defense industry for the past 60 years and now, we’re applying this tenacity and expertise to the U.S. Air Force’s (USAF) Survivable Airborne Operations Center (SAOC) mission. Join the SNC-led SAOC team and be a part of exciting and meaningful work to modernize and deliver the next-generation SAOC aircraft trusted by the President, Secretary of Defense and Chairs of the Joint Chiefs of Staff to ensure continued critical command, control and communication during national emergencies. If you’re passionate about building the airborne command post of the future, consider SNC for your next mission. Learn more about NC3 and SAOC [here](https://www.sncorp.com/capabilities/nc3-systems/). If you like solving complex IT and security problems using your deep analytical skills, this is the opportunity for you! As a Senior Systems Security Engineer, you will lead the design and implementation of our security infrastructure. You will manage complex security projects, provide strategic direction for security practices, and mentor junior engineers. **Responsibilities:** Application Administration — Backend & Frontend - 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 prepatch 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. - Maintain application licensing compliance — track license utilization, manage license server configurations, and coordinate renewals and procurement with program management. RHEL / Linux Systems Administration - 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. - Implement and maintain RHEL DISA STIG hardening — apply security controls, manage firewall rules (firewall/iptables), configure SELinux policies, and provide STIG compliance evidence for ATO/RMF packages. - Perform Linux performance tuning for application workloads — kernel parameter optimization, I/O scheduling, network stack tuning, and m…