Linux Engineer

Role Overview This position involves managing high-density Linux server infrastructures, ensuring reliable performance, and collaborating closely with application and development teams to support enterprise operations. The engineer will focus on high-availability server management, system tuning, security hardening, and supporting data integration workflows in a fast-paced, high-volume environment.

• Manage and optimize a mixed fleet of Linux servers (Ubuntu and RHEL), ensuring high availability and performance for thousands of concurrent users and remote sessions
• Configure, tune, and maintain web server platforms, including Nginx as a reverse proxy and load balancer under peak traffic conditions
• Monitor and optimize Linux networking components such as TCP/IP stack, socket buffers, and file descriptors to prevent bottlenecks in high-density session environments
• Support critical messaging and printing services, including Postfix email queues, enterprise printing solutions (CUPS), and related hardware/software integration
• Harden Linux systems using security best practices, including SELinux, App Armor, firewalls, and SSH hardening to minimize security risks and lateral movement
• Oversee data integration and replication workflows, including monitoring data feeds and maintaining automated ETL processes between Linux environments and SQL Server infrastructure
• Collaborate with development teams on application support, API integrations, and troubleshooting performance issues related to system resource utilization, particularly in environments involving COBOL-based applications running on Linux
• Diagnose and troubleshoot system and network issues, employing methodical approaches to resolve performance bottlenecks and system irregularities

• Proven hands‑on experience managing Ubuntu and RHEL in high‑concurrency, production environments
• Strong expertise in Linux system tuning, network configuration, and kernel parameters
• Proficiency with web server configuration and performance optimization, especially Nginx
• Experience with Linux security hardening including SELinux, App Armor, SSH configurations, and firewall management
• Familiarity with Postfix mail queue management, CUPS printing services, and related hardware/software support
• Understanding of data ETL pipelines, data replication, and workflows involving SQL Server or similar databases
• Excellent troubleshooting skills with a logical, analytical approach
• Ability to learn new systems quickly and adapt to evolving operational needs
• Critical thinker with strong problem‑solving skills and the capacity to work collaboratively with cross‑functional teams

• Experience supporting COBOL-based applications and understanding of legacy system integration
• Knowledge of site reliability engineering principles and practices
• Familiarity with scripting languages such as Bash, Python, or Perl for automation
• Exposure to cloud environments and containerization tools (e.g., Docker, Kubernetes)
• Prior experience working with enterprise POS systems and associated backend infrastructure

• Linux administration (Ubuntu, RHEL, CentOS)
• Web server platforms:
  Nginx, Apache
• Linux network tuning and kernel parameter optimization
• Security hardening: SELinux, App Armor, SSH hardening, firewall configuration
• Messaging systems:
  Postfix, enterprise email protocols
• Printing systems: CUPS, hardware/software integration
• Data workflows: ETL, data replication, SQL Server connectivity
• Monitoring and troubleshooting tools: tcpdump, netstat, ps, top, htop, Systemd

Career Impact This role offers the chance to lead mission‑critical Linux infrastructure operations, influence system security, and contribute to high‑availability…