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I help founders and small teams turn messy workflows, fragile automations, spreadsheets, and AI-built prototypes into reliable web and mobile apps that are ready for production use. I’m a full-stack no/low-code architect with 18+ years of IT experience. I work at the intersection of product, data architecture, automation, and implementation: I clarify the workflow, choose the right stack, build the system, explain trade-offs, and help prevent expensive structural mistakes. 𝐖𝐇𝐄𝐍 𝐈’𝐌 𝐀 𝐆𝐎𝐎𝐃 𝐅𝐈𝐓 • Scale & Stability: Your current Airtable, Bubble, Glide, Lovable, Claude/Cursor, or AI-generated setup is becoming fragile, messy, or hard to maintain. • Production Systems: You need a SaaS MVP, client portal, internal tool, mobile companion app, CRM/workflow automation, or AI-powered product that must be stable, maintainable, and ready for daily operations. • Fractional CTO / Technical Partner: You need someone to own the architecture, document the system, coordinate developers/vendors, and guide technical decisions beyond pure development. ⚠️ 𝗡𝗼𝘁 𝗮 𝗳𝗶𝘁: I’m not the best fit for cheap one-off fixes or pure task execution. 𝐓𝐄𝐂𝐇𝐍𝐈𝐂𝐀𝐋 𝐒𝐓𝐀𝐂𝐊 🧱 𝗣𝗿𝗶𝗺𝗮𝗿𝘆 𝗦𝘁𝗮𝗰𝗸: WeWeb + Supabase + n8n for serious web apps, SaaS products, internal tools, and automation-heavy systems. 📲 𝗠𝗼𝗯𝗶𝗹𝗲 𝗙𝗿𝗼𝗻𝘁𝗲𝗻𝗱: FlutterFlow as a mobile frontend connected to the same backend and automation layer. 🧰 𝗔𝗹𝘁𝗲𝗿𝗻𝗮𝘁𝗶𝘃𝗲 𝗦𝘁𝗮𝗰𝗸: Bubble, Xano, Glide, Softr, Airtable, Make, Zapier, Webflow, Figma, Docker. 🛠️ 𝗖𝗼𝗱𝗲 & 𝗔𝗜: Vue.js, JavaScript, Python, SQL, APIs, Claude Code, Cursor, Codex, Lovable. 𝐃𝐄𝐄𝐏 𝐖𝐄𝐖𝐄𝐁 & 𝐒𝐔𝐏𝐀𝐁𝐀𝐒𝐄 𝐄𝐗𝐏𝐄𝐑𝐓𝐈𝐒𝐄 I go beyond standard no-code assembly. I build custom Vue.js components, manage complex frontend states, design clean frontend/backend boundaries, and structure backends with PostgreSQL, RLS, auth, Edge Functions, SQL workflows, and disciplined SQL versioning. I fix projects where typical no-code or AI-built systems start to break. 𝐓𝐘𝐏𝐈𝐂𝐀𝐋 𝐄𝐍𝐆𝐀𝐆𝐄𝐌𝐄𝐍𝐓𝐒 • Apps & Portals: Web apps, SaaS MVPs, client portals, internal tools, and mobile companion apps. • Infrastructure Cleanup: Stabilizing and refactoring rushed AI-built, low-code, or spreadsheet-based products. • Automations & Backends: n8n/Make/Zapier workflows, secure Supabase databases, CRM integrations, webhooks, and API-based systems. • Tech Leadership: Fractional CTO support, architecture reviews, product/technical trade-offs, documentation, and handoff. 𝐄𝐍𝐆𝐀𝐆𝐄𝐌𝐄𝐍𝐓 𝐌𝐎𝐃𝐄𝐋 I bring the most value to business-critical, messy, or fast-growing projects that need architecture before implementation. Clients work with me because I can both build and advise — and because I’m comfortable calling out shortcuts that may look cheap now but become expensive later.

More than 20 years of working experience in networking and server administration. Administering and scripting networking applications, database applications, web applications and internet & intranet servers In position of expert engineer for networking infrastructure, IT security expert and senior linux/windows/OSX administrator In charge of designing of LAN/MAN/WAN networking infrastructure, designing and implementation of fiberoptic backbone and copper networking installation. Administration of linux servers and networking devices (switches, routers, firewalls, NAS) am in charge of more than 150 linux servers, both physical and virtual Working with L2/L3 switches, routers, firewalls, NAS devices, switching&routing protocols (RIP, OSPF, SNMP, IGRP/EIGRP, VTP, BGP). Certified Cisco and Mikrotik networking engineer. OS platforms - Red Hat/Centos, Debian/Ubuntu, Gentoo, OpenSolaris, BSD flavors, Windows, OSX Server. Networking equipment - Cisco, HP, Mikrotik, ZTE, Huawei Some of the open-source technologies and daemons I have experience with: - bash, perl and python scripting - apache/nginx web servers (standalone, or in backend mode for tomcat, with one or many virtual hosts) - mysql/postgresql database installation and administration - squid (with or without dansguardian+clamav as content filter/realtime AV) - cloud (openstack, AWS, Azure, gcloud, OVH, rackspace, digital ocean....) - snort (with BASE and Snorby as web GUI) and suricata IDS - iptables (with or without web GUI) - BIND (standalone or master/slave) - postfix (as MTA, combined with alot of different tools such as spamassassin, amavis, clamav, roundcube, postfixadmin, dovecot, cluebringer, mailgraph) - zenoss, zabbix and cacti (with plugins and OUIs) - dovecot (as pop3/imap server of choice, combined with postfix and amavis, clamav, roundcube, postfixadmin, spamassassin) - amavis (with alot of customized settings for things such as double AV scanning, DKIM support, catching of spam headers...) - spamassassin (standard and heuristic bayesian analysis, fine tuning of scoring, OCR integration, SPF integration....) - ClamAV (using both standard and unofficial virus definitions, making of 0-day virus signatures caught in the wild...) - freeradius (with MySQL backend for AAA) - samba (in all possible variatons - standalone simple CIFS sharing, member of windows AD, standalone AD controller, one of the controllers in windows AD) - pureftpd, vsftpd and proftpd (as standalone servers or with virtual users) - xen, vmware, hyperv and kvm virtualization (stock or Xenserver/Proxmox distributions) - asterisk (via Elastix linux distribution) - roundcube as preferred web-mail interface (with alot of customized plugins) - openmediavault/openfiler linux distros for NAS - HA clustering (failover based on DRBD and heartbeat/pacemaker+corosync) - NUT (daemon for UPS monitoring and controlling) - openvpn (with various configurations and backends) - pptp vpns (with various configs and backends) - all kind of linux distributions - RH, CentOS, openSuSe, Debian, Ubuntu, Gentoo, Arch.... - hardening of linux distributions (iptables, fail2bain, allow/deny mechanism, AIDE, SELinux, AppArmour, occasional pen testing) - puppet automation - rancid (centralized backup of config files) - bacula, urbackup and rsync backup

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)

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.

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.