Hire the Best System Administrators
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Systems Administrator specializing in VMware, Hyper-V, Windows Server, Linux, Oracle databases, virtualization, infrastructure troubleshooting, and production systems support. I help businesses diagnose infrastructure issues, stabilize production environments, optimize virtual machines, and resolve complex server and storage problems under real-world load. My experience includes: ✔ VMware & Hyper-V virtualization ✔ Windows Server administration ✔ Linux systems administration ✔ Oracle 19c administration & troubleshooting ✔ Infrastructure troubleshooting & performance analysis ✔ RAID, storage & recovery diagnostics ✔ VPS, dedicated server & hosting environments ✔ Backup & disaster recovery support ✔ PowerShell & Bash automation ✔ Email, DNS & server migrations ✔ Monitoring, stability & capacity planning Recent projects include Hyper-V VM scaling and performance stabilization, RAID recovery diagnostics on HPE servers, Linux/WHMCS migrations, Oracle environment troubleshooting, mail infrastructure troubleshooting, and production environment recovery. I focus on identifying root causes quickly, minimizing downtime, and delivering practical solutions for critical systems.

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 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!

Solution-oriented, highly analytical and resourceful candidate with extensive experience in 3 Serbian banks. - over 5 years working experience in Microsoft Windows server editions 2003/2008 (active directory, DNS, DHC, NAT, WDS, WSUS, NAS, LAN, WAN etc.) - Over 10 years of working experience as a system administrator in Windows 2000/XP/Vista/ 7/ 8 editions. Provided installation, configuration, troubleshooting and customer assistance on both server and desktop platforms. Provided systems upgrade, installing new hardware and software. Expert knowledge of complete windows desktop systems, processes, peripherals, registry, Microsoft Office, hardware etc. Expert knowledge of help desk support and remote technical troubleshooting. Fast problem solving and multitasking, ability to analyze in-depth problems in short time. Used to work under preassure. 

⚡️⚡️⚡️TOP rated IT Specialist⚡️⚡️⚡️ Need quick IT support or a reliable expert for long-term projects? Extensive background in system administration, server and network architecture, security, endpoint protection, and data center operations. Proven problem-solving skills and decisiveness enable effective direction and resolution of complex technical issues on a global scale, even under strict time constraints and budgetary limits. Assistance with securing IT environments (NIST, GDPR, NIS2, ISO 27001) or implementing infrastructure. Here are some feedback: - Excellent work. Very flexible and knowledgeable. - So strong skill and very quick to help me with my vpn setting on windows server with AD integration. Will work with him again and again. - Dejan's understanding of Windows Server Administration and AWS is amazing.. - Dejan, your knack for untangling Windows Group Policy and Domain issues saved our project. Top-notch work! - Executed quickly, highly responsive. Great experience and a true professional. - Windows server security - Very impressed with Dejan's work. Will hire him again. - Dejan was great expert and help us a lot. He gave us a whole picture and advice what to do next. Thank him a lot ! - Dejan was very responsive and supportive! He was willing to take up topics of research that were new/ unfamiliar and troubleshoot issues. I would definitely recommend him! - Very knowledgeable with VMWare, helped me get my server back online and added additional protections to prevent any further complications. Not to mention he was able to help with my situation right away! Will be hiring again with anything related to VMware. - Dejan made a great and fast troubleshoot for our Windows Server 2012 R2. He has a lot of knowledge and experience. Our problem was solved under 30 minutes.

System Engineer/ Cisco engineer for 10 years now. Proxmox master proffieciency and deploying Ceph clusters Linux master usage- Ubuntu,Centos,Gentoo Worked on administration of Windows machines from Xp to 10 now. NAS intermediate proficiency(QNAP expert, Synology and FreeNAS/Openmediavault intermediate) Cisco stenghts: Wireless(controller and access points), Voice(Callmanager,CallCenter, H.323 voice gateways), routing and switching(L3VPN,VLANs), security(ASA configuration)

I work full time as linux & hosting administrator. I love my job and I will always find time to listen, give advice and help you with your problems. I'm behind all major migration projects in my company and I can use that knowledge to help you with your migrations, either migrating it myself or in role of organizer/consultant. I've successfully managed various cross platform migrations: CPanel-Plesk CPanel-Webmin Plesk-CPanel Direct Admin-CPanel Custom/Unmanaged-CPanel If you require training, I can prepare tests and plan training depending on needs (sales, support, clients). What you should contact me for: Domain/DNS/E Mail issues CPanel/WHM projects (installation/configuration/upgrade, security enforcement, troubleshooting) Migrations/domain transfers WordPress projects (all non-design related tasks: upgrade, migration, troubleshooting)