~/cojan.ro
andrei@cojan: ~ — bash

andrei@cojan:~$ whoami

Andrei Cojan

Linux System Administrator

andrei@cojan:~$ cat about.txt

Linux systems. Human solutions.

I help teams run reliable hosting, servers, and networks.

focus:
hosting / networks / automation
experience:
since 2009
Let's talk
Explore my expertise

andrei@cojan:~$ map --expertise

Cojan connects Linux, hosting, networks, and automation.

BGP / IPv6 / Proxmox / Bash

andrei@cojan:~$ ./expertise.sh --list

Linux & hosting

Production servers, cPanel/WHM, and practical operations.

Networks & routing

BGP, IPv6, peering, and resilient connectivity.

Automation

Bash workflows that reduce repetitive work.

andrei@cojan:~$ ls ~/field-notes/

all writing
why-i-built-pmxspan-proxmox-reinstalls.md

Reinstalling a Proxmox VM Shouldn't Be a Manual Job: Why I Built PMXSpan

Reinstalling a Proxmox guest by hand is five small steps and plenty of room for mistakes. I built PMXSpan to rebuild VMs and containers from fresh vendor images while keeping the VMID, MACs and IPs, with an IPAM that refuses to guess.
sshspan-local-first-ssh-key-manager.md

SSH Keys Shouldn't Need Another Cloud Account: Why I Built SSHSpan

SSH keys are simple until you have enough of them. I built SSHSpan to manage, encrypt, organize and deploy them locally without another cloud account, subscription or piece of infrastructure to babysit.
andrei@cojan:~$ cat credentials.logexperience & certifications

experience.log

Web Hosting Management
Managed cPanel/WHM, DirectAdmin, ISPConfig, WHMCS, HostBill (and more) environments for multiple clients since 2009.
Infrastructure Automation
Lead technical operations and automation for IT/telecom services, streamlining infrastructure performance.
Data Center Operations
Managed virtualization and telecom projects in datacenter environments at LayerBridge and other DCs.
Network Engineering
Configured and maintained BGP, IPv6, RPKI, OSPF across Cisco, Juniper, Arista, and pfSense platforms.
Cloud & On-Prem Infrastructure
Managed hybrid infrastructure with focus on monitoring, security, and performance optimization.
Virtualization Deployment
Implemented and managed VMware, Proxmox, Ovirt, OpenVZ, SolusVM (and more) environments for production use.
Linux System Administration
15+ years managing Debian, Ubuntu, CentOS, Red Hat, and Fedora systems in production environments.
Security & Compliance
Implemented security measures and compliance protocols across hosting and telecom infrastructure.
Technical Leadership
Founded and led technical operations for multiple companies including ENGINYRING EUROPE and LayerBridge.
Routing & Network Protocols
Cisco, Arista, Quagga, BIRD routing daemons, BGP peering, Internet Exchanges, and IP deployment.

certifications.sh

  • ARISTA Networks: Network Automation Professional CertificateFeb 2025
  • Microsoft Security Essentials Professional CertificateFeb 2025
  • NetOps (DevOps for Network Engineers): Automating NetworksFeb 2025
  • cPanel Certified Partner AccreditationNov 2025
  • cPanel & WHM System Administrator II (CWSA-2)Sep 2024
  • WHM Administration Certification Exam (CWA) - Tier 3Nov 2022
  • cPanel Professional Certification Exam (CPP) - Tier 2Nov 2022