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I'm network and VOIP engineer with 11 years of experience. Over time I've completed the following certificates: 1. CCNA 2. CCNA security 3. CCNA wireless 4. CCNP - Not certified yet 5. MTCNA 6. MTCRE 7. Linux Essentials 8. LPIC-1 9. Sophos UTM Engineer 10. dCAA 11. 3CX I have experience with the following vendors: Cisco Cisco ACI MikroTIK Sophos UTM Fortinet Checkpoint HP Ubiquiti - Unifi Juniper Alied Telesis PfSense I can help you with: Router configuration WAN Failover VPNs - IPSec, L2TP, OpenVPN etc... Routing - Static, Dynamic including OSPF and BGP MPLS - L3VPN IPSec Firewall - Filter rules, mangle rules etc... FHRP VRF QoS Switch configuration Vlans FHRP Etherchannel Port security Voice Vlan Trunks Troubleshooting Wireless configuration Cisco WLC and LWAPs Ubiquity Unifi - AP, Switch, USG MikroTIK - I have probably configured 500+ MikroTIK devices VOIP 3CX PBX deployment on prem and in cloud Phone management SIP Trunk management DID management IVR Queues Ring Groups etc... Email security Sophos UTM email filter Spam Titan email filter DNS - SPF, DKIM, DMARC Reach out if you find this interesting and we can discuss the details about your project.

• Expert linux server administrator and DevOps • Apache2 webserver configuration (vhosts, proxy,load balancing) • NGINX webserver configuration from scratch (load balancer, proxy) • Docker containers, debugging, configuring compose files, docker swarm. • Qemu-KVM, Proxmox virtualization, LXC containers. • SFTP configuration for FTP access. • IPtables for blocking traffic in or out. • Issuing and implementation of SSL certificates in Nginx/Apache2. • HTTPS implementation, redirection from Non-SSL to SSL. • Expert skills in configuring/installing Zabbix monitoring. • Installing Zabbix agents, alerting, triggers, log monitoring, graphs. • Implementation of Maxmind GeoIP2 modules Apache/NGINX. • Configuring GeoIP based country blocks, redirections based of client IP's. • Ansible server orchestration. Configuring playbooks. • AWS, Digitalocean, Linode, Azure. • VPN implementation(OpenVPN,wireguard) • Proxy installation/setup • Cloudflare CDN implementation • MySQL, Redis, MongoDB installation/configuration. • Linux server file backups, mysql backups. • Linux shell scripting

Configure, monitor, and maintain routers and switches (access, aggregation, and service routers). Implement and troubleshoot dynamic routing protocols (BGP, IS-IS, OSPF) and static routing. Manage QoS policies including policing, shaping, and traffic prioritization. Analyze and resolve issues related to L2VPN, L2TP, NAT, TCP/UDP performance, and network slicing. Work with synchronization technologies such as PTP and SyncE, including troubleshooting PDV, servo states, and ESMC/SSM propagation. Support optical and transport technologies (DWDM, OTU4, OSC, SDH/SONET). Conduct network performance testing, monitoring (alarms, PDV measurements, interface utilization), and packet analysis (e.g., Wireshark). Provide expertise in access vs. service router roles and integration with SIP/SBC infrastructure. Document network designs, configurations, and troubleshooting procedures.

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)

⚡️⚡️⚡️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.

I have 35+ years experience in network projects including design, implementation, system administration and in software development. For the first 5 years of my career I worked on software development: coding and especially testing. For the last 30 years I'm working on implementation and maintenance of University of Nis WAN. Last 26 years I'm deeply involved in AMRES (Academic Network of Serbia) project. Don't fix it if it ain't broken, don't break it if you can't fix it! SKILLS SUMMARY - Any system administration tasks - Operating Systems: any *nix (Linux, FreeBSD, SGI IRIX, SCO, Solaris, OSX), Windows 3.1/9x/Me/XP/Vista/W7/W8/W10/W11, WinServer NT/2K/2003/2008/2012/2016 - LAN & WAN: Ethernet, Fast Ethernet, Gigabit Ethernet, FDDI and Wireless LANs. T1/T3, SDH/SONET, Frame Relay, WDM, ISDN, ADSL, SHDSL, Cable Modems, Cellular, X.25. - Network Protocols: TCP/IP, IPv6, UDP, OSI, CDP, IP Multicast, IPSec, VoIP, Routing, VLANs, Bridging, Trunking, VPN, SNA, DLS - Network Services & servers: SMTP/POP3/IMAP, FTP/SFTP, Telnet/SSH, HTTP/HTTPS, DNS, DHCP, NNTP, NTP, LDAP, SNMP, NETBIOS, Apache, Nginx, MySQL, Plesk, cPanel, Zimbra, VMware, CentOS, Ubuntu, Debian - Network Equipment: various types of modems, firewalls, switches and routers. - Dedicated, VPS and cloud environment servers (Amazon AWS, Google Cloud, MS Azure, Digital Ocean, Linode). - Programming Languages: Unix Shell scripting, BASH, C, Pascal, MS Visual Basic, PHP, HTML, (a bit of Python).