Linux System Engineer

Systems Engineer - LinuxCore ResponsibilitiesHigh-Density Infrastructure ManagementManage and optimize a mixed fleet of Ubuntu and RHEL servers, maintaining high availability for large volumes of concurrent remote sessionsOversee secure handoffs between RDP gateways and backend SSH environmentsConfigure and tune Nginx as a high-performance reverse proxy and load balancer under peak traffic conditionsMonitor and tune the Linux networking stack (TCP/IP limits, file descriptors, socket buffers) to prevent bottlenecks in high-density session environmentsCritical Services & Messaging OperationsManage Postfix mail queues for transactional messaging and internal relay operationsSupport enterprise-scale printing via CUPS, resolving driver conflicts and spooling issues across a distributed environmentSecurity & HardeningApply security best practices across Ubuntu and RHEL fleets using SELinux, AppArmor, and firewall configurations to maintain a defense-in-depth postureHarden SSH configurations and access entry points to limit lateral movement riskData Integration SupportMonitor and maintain outbound data feed replication from Linux-based systems to Microsoft SQL Server environmentsEnsure the integrity of automated ETL scripts and data pipelines across heterogeneous systemsQualificationsStrong hands-on experience administering Ubuntu and RHEL in high-concurrency production environmentsProficiency with Nginx, Linux kernel and network tuning, and SSH hardeningWorking knowledge of Postfix, CUPS, SELinux, and AppArmFamiliarity with ETL pipelines and SQL Server replicationStrong diagnostic instincts and a methodical approach to troubleshooting