ISC is the market-leading provider of banking systems to almost all commercial banks in Iran and many financial institutions with more than 2000 employees.•System Provisioning and Setup: Built, configured, and maintained over 50 Linux servers (both on-premise and cloud-based) to support business-critical applications, ensuring the environments met performance, security, and stability requirements.•Server and Application Monitoring: Implemented and managed monitoring systems (Prometheus, Grafana, Nagios) to monitor system health, application performance, and resource utilization, 90% decrease in unplanned downtimes through proactive alerts.•Configuration Management: Utilized tools like Ansible and Puppet to automate configuration management, leading to more consistent server setups, reducing human error by 90%, and improving overall system reliability.•Network Management: Configured and maintained firewalls, VPNs, and DNS servers, ensuring seamless communication between on-premise and remote resources while enforcing security policies.•Backup & Disaster Recovery: Developed and managed backup strategies using rsync, tar, and cloud storage solutions•Virtualization and Containerization: Deployed virtual machines using KVM and managed containers via Docker, streamlining the development and testing process, which reduced deployment times by 40% and resource overhead by 60%.•Security Hardening: Secured systems through user role management, SELinux, firewalls, and encryption tools. Implemented regular security audits, vulnerability assessments, and patched security holes, reducing security risks by 90%.•High Availability (HA) Setup: Designed and implemented HA systems using clustering technologies (e.g., Pacemaker, Corosync) and load balancers, ensuring continuous availability for mission-critical services.