Hire the Best VMware ESX Server Specialists
in Serbia

I help businesses implement secure monitoring platforms, troubleshoot complex infrastructure problems, recover compromised systems, and stabilize production environments across Linux, Windows, VMware, Hyper-V, and Oracle technologies. My recent work includes the implementation and final validation of a secure Zabbix-based MSP monitoring proof of concept. The project covered application configuration, MSP standardization, onboarding of the initial reference environment, Windows and Linux monitoring, Zabbix Server and Proxy communication, Agent 2 deployment, PSK-encrypted connections, templates, triggers, maintenance periods, and helpdesk alerting. Core areas I can help with: • Zabbix Server, Proxy, Agent and Agent 2 implementation • Secure host onboarding using PSK encryption • Windows and Linux infrastructure monitoring • Templates, items, triggers, macros and host configuration • Alerting, email notifications and helpdesk integration • Maintenance periods, history and data-retention configuration • VMware ESXi, vSphere, Hyper-V and virtual machine troubleshooting • Linux and Windows Server administration and hardening • Oracle database administration and connectivity troubleshooting • Security incident investigation, malware cleanup and recovery • SSL/TLS certificate troubleshooting • PowerShell, Bash and infrastructure automation I work methodically, communicate clearly throughout the engagement, and document important configuration decisions. My focus is not only on resolving the immediate issue, but on delivering a secure, maintainable solution that can be operated reliably after handover. Recent client results include: • Secure Zabbix MSP monitoring proof of concept successfully implemented and validated • Compromised Ubuntu and WordPress infrastructure containing 155+ websites recovered and hardened • Hyper-V virtual machine memory and performance issues diagnosed and stabilized • VMware ESXi 5.5 certificate issue resolved after previous unsuccessful attempts If you need help with Zabbix monitoring, infrastructure troubleshooting, virtualization, server security or production systems support, feel free to send me a message.

Network & IT Infrastructure Expert | Mikrotik | VPN | Linux | Cloud With 25 years of experience in IT infrastructure and network engineering, I specialize in designing, securing, and optimizing network systems for businesses of all sizes. Whether you need a reliable VPN solution, a secure network setup, or an optimized server infrastructure, I can help you achieve your goals efficiently. What I Offer: Mikrotik & Network Configuration – Routing, Firewall, VLANs, QoS, Wireless VPN & Secure Networking – WireGuard, OpenVPN, IPsec, GRE tunnels Linux System Administration – Ubuntu, CentOS, Debian, server automation Cloud & Backup Solutions – Veeam, Rsync, ZFS, Proxmox, Disaster Recovery Server & API Hosting – OpenStreetMap servers, self-hosted solutions Troubleshooting & Performance Optimization – Network monitoring, security hardening Web Development – Next.js websites, WordPress to Next.js migrations I have worked with businesses, startups, and enterprise clients to ensure their IT infrastructure is secure, scalable, and high-performing. My approach is straightforward – I analyze, optimize, and deliver solutions that just work. Let’s connect and discuss how I can help with your project!

I’m a Senior System and Network Engineer with over 18 years of hands-on experience in IT infrastructure, cybersecurity, and cloud environments. As the founder of AOVD Systems, I help businesses and professionals around the world design, secure, and optimize their digital environments — from local servers to global cloud platforms. ⸻ 🔧 What I Do I deliver end-to-end IT solutions that are secure, scalable, and cost-efficient. My core areas of expertise include: • 🖥️ System Administration & Virtualization – Microsoft Server, VMware, Hyper-V, ESXi • ☁️ Cloud & Microsoft 365 Migration – Azure AD, Exchange Online, Intune • 🔐 VPN Configuration & Network Security – IPSec, SSL VPN, SAML, Multi-factor Authentication • 🧱 Firewall & Endpoint Protection – Fortigate, SonicWall, Cisco, Huntress, FieldEffect, Defender for Business • 💾 Backup & Disaster Recovery – Veeam, Nable, Acronis, Anxient • 📈 Network Performance & Monitoring – PRTG, Nagios, ManageEngine, NetFlow Analyzer • 🔄 Managed IT Services & Remote Support – 24/7 monitoring, patch management, SLA-based response ⸻ 🌍 Who I Work With I’ve supported clients across Europe and the U.S., including: • Government and public institutions • Small and medium businesses seeking reliable IT outsourcing • Professional poker players and private clients requiring secure, anonymous, and latency-optimized VPN setups • Teams transitioning from local servers to the cloud or hybrid infrastructure I combine enterprise-level knowledge with a hands-on, personal approach — ensuring speed, security, and discretion at every step. ⸻ 🎯 Why Clients Choose Me • Proven track record of resolving complex infrastructure issues under pressure • Certified expertise across multiple vendor ecosystems (Microsoft, Cisco, VMware, Veeam) • Transparent communication and detailed technical reporting • Tailored solutions — I don’t copy-paste templates, I solve your specific problem “Vladimir fixed in one hour what others couldn’t in three days.” “Professional, responsive, and precise. My systems are finally stable.” ⸻ 🎓 Certifications & Training • Microsoft Certified Solutions Expert (MCSE) – Server Infrastructure • Cisco Certified Network Professional (CCNP) – Routing & Switching • VMware Certified Professional (VCP) – Data Center Virtualization • Veeam Certified Engineer (VMCE) – Backup & Replication • Microsoft 365 & Azure Administrator Associate • Nagios & PRTG Advanced Monitoring Implementation • ManageEngine Suite Training – Endpoint Central & NetFlow Continuous learning is part of my work ethic — I stay updated with the latest in cybersecurity, automation, and cloud technologies to deliver cutting-edge solutions to every client. ⸻ 🚀 Let’s Work Together Whether you need a VPN configuration, network performance audit, or complete IT infrastructure management, I’ll help you build systems that are secure, stable, and future-ready. 📩 Let’s connect — tell me about your IT challenge, and I’ll design a fast, professional, and cost-effective solution.

My name is Djordje(George) Colic. I live in Serbia. I am windows and linux server system administrator. I have MCSA certificate. For 8 years I was working as system administrator for Mcs systems from San Diego and Miami Lakes IT . This is remote job. I heave experience in using ConnectWise and Ninja RMM as remote management tools. I am logging in to remote networks via ConnectWise or VPN- L2TP/IPsec or OpenVPN and then I use RDP to login to server or any workstation. I am giving support to customers via phone, ConnectWise , RDP or TeamViewer. This support includes their servers, workstations, printers , support with their dedicated applications , office 365. I am giving suport to VOIP customers. They have AT&T Synpase or SkyTalk phone system. Synapse Gateways are PSTN 67010 or SIP 67070. Routers: I was working with SonicWall , Peplink , Mikrotik routers . I am in charge for the maintenance of customer’s and office servers and workstations . For automation tasks I am using batch and powershell scripts. Server OS: Windows Server 2016 or 2012. Workstations: windows 10 or 7. Linux server OS: Red Hat . I am logging in to linux servers via SSH to do every day management tasks. Virtualization: VMWare , HyperV. Cloud: I have experience working in AWS . Every network is Domain network with Domain Controller. For file server we are using Synology NAS where important documents are kept on network share. I am also using NAS as VPN server to access remote network. I have knowledge of Java programming and power shell. As DevOPS engineer , I was working for Avi . Our client had Ping Directory , Ping Proxy servers . There were different environments. Server OS: Red Hat Enterprise Linux Server release 7.9 . I was logging into client network via SSH. I have experience in managing linux servers.

I am information technologies security specialist, having more than 10 years of experience in web hosting technologies. Well experienced in web hosting as WHM/Panel , Webmin , VMware ESXi, XEN, Google Cloud Platform, Apache, Nginx, Mysql, VPS server and website transfer, Server optimization, Security and other related task. I am readily available and responsible ! Ready to start working at your project right now! Full Time Freelancer. Available 40+hr/week Development Skills: • PHP • Mysql • Laravel Framework • Wordpress • Joomla • phpBB ********************* My Core Strengths In Wordpress : • Plugin update • Theme update • Wordpress install and setup • Wordpress update / Upgrade • Theme install and customization • Plugin install and customization • Content update - Backup Creation • WordPress back end develop • Wordpress e-Commerce • WP- eshop • WP- eStore • Woo Commerce

Designing, crating, administering and troubleshooting network environments are my main skills. For last 10 years I passed the road from Junior System Admin to Senior System Engineer working in couple network project and support companies. Windows Servers, HyperV, System Center, Office 365, Azure, Domains, all kind of server roles and features, Exchange, Backup, Virtualization, SAN, NAS etc. are some of the fields where I'm most experienced. For last four years I work as full time Senior System Admin in IT Support company from Germany, so my skills and knowledge are in a grate shape. At the moment I'm recognized as Certified Microsoft MCP, MCITS (HyperV), MCSA, MCSE (Server Infrastructure), MCSE (Cloud Infrastructure) and VMWare VCA-DCV6. My English is fluent in writing and speaking and also I can speak and write German on a level B2, and my native language is Serbian. This gives me ability to provide support on a systems with different language in use. I'm a part-time and ad-hock freelancer and I can give support in US and Europe business hours.