Linux System Engineer

Systems Engineer - Linux

Core Responsibilities

High-Density Infrastructure Management

• Manage and optimize a mixed fleet of Ubuntu and RHEL servers, maintaining high availability for large volumes of concurrent remote sessions
• Oversee secure handoffs between RDP gateways and backend SSH environments
• Configure and tune Nginx as a high-performance reverse proxy and load balancer under peak traffic conditions
• Monitor and tune the Linux networking stack (TCP/IP limits, file descriptors, socket buffers) to prevent bottlenecks in high-density session environments

Critical Services & Messaging Operations

• Manage Postfix mail queues for transactional messaging and internal relay operations
• Support enterprise-scale printing via CUPS, resolving driver conflicts and spooling issues across a distributed environment

Security & Hardening

• Apply security best practices across Ubuntu and RHEL fleets using SELinux, AppArmor, and firewall configurations to maintain a defense-in-depth posture
• Harden SSH configurations and access entry points to limit lateral movement risk

Data Integration Support

• Monitor and maintain outbound data feed replication from Linux-based systems to Microsoft SQL Server environments
• Ensure the integrity of automated ETL scripts and data pipelines across heterogeneous systems

Qualifications

• Strong hands-on experience administering Ubuntu and RHEL in high-concurrency production environments
• Proficiency with Nginx, Linux kernel and network tuning, and SSH hardening
• Working knowledge of Postfix, CUPS, SELinux, and AppArm
• Familiarity with ETL pipelines and SQL Server replication
• Strong diagnostic instincts and a methodical approach to troubleshooting