Zeljko Stojevic

System Engineer experienced in Linux and windows administration. My current focus and area of learning, implementing and improving is Building, deploying and automating configuration of on-premise virtual machines and containers. Along with build and deployment comes a very important factor called Cyber security for which I maintaining highest possible level of privacy and network security. Besides the on-premise infrastructure for which I dedicate a large portion of my time to protect mission critical and sensitive data, I offer service of VM deployment into private cloud within OpenStack. Nothing would be briefly possible without data integrity and firm IPS and IDS as well as DR. I am very passionate about legacy systems, Operations technology and older technologies which can still be used today due to their reliability and resilience, such as: IBM AS/400, AS z/OS and backing up data on old school lto tape drives. Sometimes we need to take a step backward in order to leap forward and preserve and protect our data. I offer services of building and maintaining Air-Gap networks for highest level of security from outside threats even with low-performing hardware which can still run light weight Linux such as: Debian minimal, Alpine OS, TinyCore, Lubuntu, Qubes OS, Tails OS. My work with deployment, configuration automation, and provisioning include:

• Kali OS (Host)

• VM (Ubuntu, Debian, Alpine OS)

• Scripting (Bash)

• Configuration (Ansible)

• Provisioning ( Vagrant )

• Version control system ( Bitbucket)

• Virtualization tools (Virtualbox, Vmware, QEMU)

• Backup and recovery of my work (rsync, UrBackup)

For my OT path I am using sandboxes within virtualbox to emulate:

• SCADA Server and HMI (ScadaBR)

• PLC Nodes and simulator (OpenPLC)

• Network Monitor (Wireshark)

For example of my work and documentation I kindly ask of you to visit:

https://bitbucket.org/ovozemaljskibog/workspace/repositories/