Hire the Best Load Balancing Specialists
in Serbia

Hello there my name is Nemanja and I work as an IT Technician at a local computer shop I am in love with open source technology, especially with GNU/Linux. I have over 5 years of experience in troubleshooting and fixing desktop computers, network equipment, and servers for all kind of purposes.

- Cyber Security & Penetration Testing: Vulnerability assessment, security auditing, and proactive defense strategies. - Incident Response & Digital Forensics: Post-attack reconstruction, root cause analysis (RCA), and secure system recovery after a breach. - Website Security & Hardening: DDoS & Brute force protection, Cloudflare, Sucuri, WAF, Imunify360. - Self-Hosted AI Automation & Assistants: VPS setup, hardening, and maintenance of n8n, Activepieces, and OpenClaw — build unlimited AI workflows and run your own private AI assistant, fully self-hosted with all data on your server. No per-task fees, no third-party cloud. Security-first configuration (firewall, SSL, sandboxing, backups). - Application Deployment & CI/CD: Self-hosted PaaS setup using Coolify — deploy full-stack applications, static sites, APIs, and databases directly from GitHub, GitLab, or Bitbucket. Automated SSL, Docker-based deployments, and one-click services (280+) on your own infrastructure. A secure, cost-effective alternative to Heroku, Vercel, and Netlify with full data ownership. - Operating Systems (OS) Administration: Expert in Linux distributions: Ubuntu, CloudLinux, AlmaLinux, Rocky Linux, RHEL, and Debian. - Web Server Management: Advanced configuration and tuning of NGINX, Apache, and LiteSpeed - Website Performance & Speed Optimization: Specialist in Google PageSpeed Insights and GTmetrix (Mobile & Desktop tuning). - Digital Tracking & Analytics: Expert setup of Google Tag Manager (GTM) and Google Analytics 4 (GA4), including custom event tracking and conversion setup for E-commerce. - Hosting & Domain Administration: Migration, WHM/cPanel, StackCP, Webmin, Virtualmin, Cyberpanel. - WordPress & WooCommerce: Website development (Elementor, Divi), maintenance, debugging, and malware removal. - Object Caching & Database Optimization: Redis, Memcached, MySQL/MariaDB optimization. - VPS & Dedicated Servers Configuration: AWS, Google Cloud, Digital Ocean, Hetzner, Contabo, Vultr, etc. - DNS & Email Deliverability: Professional DNS management (SPF, DKIM, DMARC), Cloudflare Email Routing. - Bulk Email Systems: Amazon SES, Mailgun, SendGrid, Postmark, Mautic, Sendy. - Hosting Automation: WHMCS & Upmind (specializing in WHMCS to Upmind migrations). - Content Protection: DMCA protection and SSL management. - Service Excellence: 100% accuracy, fast response, and adjustable to all time zones. Other: Graphic Design: flyer, brochure, magazine, catalog, presentation, logo, font vectorization, preparing Files and Documents for Print (crop mark, trim line, bleed area, RGB to CMYK conversion, PMS Solid colors Pantone), Variable Data, Excel XML, minimalist design, wood engraving mockup, DST embroidery file conversion, Recover Corrupted videos, ads marketing Photo Editing: manipulation, retouching, mockup, product photo editing, removal of background (hair, fur) Video & Audio Editing: crop, noise reduction, warp stabilizer, montage, transitions, effects My Resume: -Disciplined, hard-working, responsible -Used to having high responsibilities and constant improvement -Good at adjusting to the team I'm in -Extremely detailed, efficient, and quality work Education: - Electrical Engineering University of Niš, Serbia Certificates: - TryHackMe – Cyber Security - Cisco CCNA (Network Associate Routing & Switching) - Cisco End User: Network Security - Ultimate AWS Certified Cloud Practitioner - Proxmox VE 6 - Visual and Graphic Design - Adobe Photoshop, Illustrator, InDesign, Premiere, After Effects

• 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.

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).

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.