Hire the Best Linux System Administrators
in Montenegro

I'm a proficient Linux Server Administrator and PHP/Python programmer with over 15 years of experience. My expertise extends to web hosting, cloud, cluster, DevOps and blockchain technologies. Throughout my career, I have worked with numerous hosting providers and have gained extensive experience in addressing vulnerabilities, viruses, spam detection, server optimization, and server software optimization. As a DevOps professional, I collaborate with various companies with developer teams ranging from 1 to 50. I have extensive experience in automating infrastructure, implementing CI/CD pipelines, managing cloud environments (AWS, Azure, GCP), and ensuring system reliability and scalability. Below are my general skills: * Blockchain platforms: Bitcoin, Tron (TRX, USDT), Ethereum (ETH, USDT, USDC), XRP (full node & API) * DevOps: GitLab, GitHub, Azure DevOps. Project support, CI/CD * Optimization of Google Pagespeed, Magento, WordPress, ODOO, Mautic, Drupal, Joomla, Bitrix, Bitrix24, and other CMS * Operating Systems: Debian, Ubuntu, CentOS, Rocky Linux, AlmaLinux, RedHat, CloudLinux, Gentoo, FreeBSD (administration, configuration, audit, optimization) * Software Configuration Management: Salt, Ansible * Web servers: Nginx, Apache, LiteSpeed (installation, configuration, optimization) * Database servers: MySQL, PostgreSQL, MariaDB, Percona, MongoDB (installation, configuration, optimization, profiling, cluster creation) * Mail servers: Exim, Postfix, Sendmail, Zimbra, Qmail, Dovecot + Spamassassin, ClamAV * Webhosting Administration Panels: cPanel / WHM, Plesk, aaPanel, Proxmox, CyberPanel, VestaCP, HestiaCP, ISPManager, Billmanager, ISPConfig, DirectAdmin, Webmin * Monitoring: Zabbix, Wazuh, Munin, Nagios, Icinga * Amazon: AWS setup or Amazon tools * Virtualization: Proxmox, OpenVZ, XEN, KVM, VMWare, VirtualBox, Docker * Load balancing via: HAproxy, Nginx, Pingora, ProxySQL, PowerDNS, BIND, Route53, Alibaba Cloud DNS * System Backup and Restore automation * Removal of viruses and malicious software * Network services: DNS (Bind, PowerDNS), VPN (MPD, PPTPD, OpenVPN), firewalls (iptables, ipfw), file server (samba3/4), proxies (Squid, 3proxy, Privoxy, Nginx), DRBD, Ceph, GlusterFS, lsyncd * FTP: Vsftp, Pureftp, Proftpd Thank you for viewing!

Top-ranked Linux Infrastructure and Network Security Specialist with over 15 years of hands-on experience. I have delivered enterprise-grade solutions to clients across multiple industries — 3,000+ hours on Upwork, and I still treat every project like it is the first one. I worked with energy companies, healthcare organizations, fintech platforms, banks, insurance and leasing companies. Some of my work involved GCP cost optimization and SACS-002 compliance for energy sector, zero-breach security implementations for healthcare, and multi-location VPN/firewall solutions for enterprise clients. I am comfortable working with development teams, security specialists, or directly with C-level executives — whatever project requires. My main focus is Linux systems and network security, with strong accent on keeping things stable, secure and well-documented. I have experience with traditional and next-generation firewalls, and I can handle everything from basic routing, switching and ACLs to more advanced stuff like IPS/IDS, inline antivirus, anti-malware, HTTP/HTTPS web filtering, and various VPN types — IPSec (pure or combined with GRE, L2TP), SSL VPN, OpenVPN, WireGuard, client-to-site, site-to-site. What I bring: 15+ years Linux Systems Administration (RHEL, Ubuntu, Debian, Rocky, Alma) 4+ years Cloud Architecture — GCP and AWS, average 30% cost reduction achieved for clients 5+ years Cybersecurity, compliance and vulnerability assessment 4+ years Virtualization — KVM, VMware, Hyper-V, Proxmox LAMP/LEMP stacks, load balancing, high availability, zero-downtime deployments 99.99% uptime track record across all long-term engagements I take security seriously — both technical and business side. I am willing to sign NDA and I treat client data with full confidentiality. If you need someone who will take ownership of your infrastructure and not just execute tickets, feel free to reach me out!

server-administration, linux-system-administration, windows-administration, unix, freebsd, clustering, amazon-web-services, virtualization, openvz, plesk, cpanel, customer-support, helpdesk-support, internet-applications, database-management, mysql, postgresql, microsoft-sql-server, rdbms, mail-servers, dns, web-services, iis, apache, lighttpd, nginx, apache-tomcat, jboss, security, openvpn, billing

I'm a IT geek with experience in designing, implementing and administrating small-medium sized networks and IT infrastructures. Whether you are trying to set-up your personal mail server, spin up a new Apache web server for your website or even harden your complete network to make it secure - I can help you out!

✅ Top Rated Plus (Top 3%) Upwork Freelancer ✅ 100% Job Success Ratio ✅ 32+ Successfully Completed Jobs ✅ 8+ years experience For many years, I have worked as a Unix system administrator, but then I went back to my childhood passion - programming. And what better place for it than mobile app development! I’m developing Android apps more than 10 years now and iOS apps (using Swift/Objective-C for more than 8 years) expanding my knowledge and expertise every day. While I have a strong knowledge of basics and standard Android and iOS frameworks, I also have experience in wide number of third-party SDKs: Firebase, Facebook, Google Maps etc. I’m devoted to writing quality clean code that will be a delight for anyone who takes over and you won’t have problems developing your app further along. Also, my analytical skills developed in system administration days are of great help developing your app idea even further. Looking forward for long-term cooperation. - My Skills: ✔️︎ iOS (iPhone/iPad,iOS), Objective-C, Swift / SwiftUI, Xcode ✔️︎ Android (Java, Kotlin, Android Studio) ✔️︎ Cross Mobile App Developer with Flutter ✔️︎ API Development using XMPP, Socket.io, WebSocket ✔️︎ API Integration(JSON, XML, REST/SOAP) ✔️︎ Coding Architecture (MVP, MVVM) ✔️︎ Mobile App Database (MySql, SQLite, Core Data, Realm) ✔️︎ Google, Facebook, Instagram, LinkedIn, Twitter APIs. ✔️︎ Apple and Google Pay, In-app billing services like Integrating in-app purchases, selling consumable-non consumable products, virtual and physical goods. ✔️︎ Integrating push notifications and handling the backend as well for this (APNs, Firebase, OneSignal). ✔️︎ Payment integration (Stripe, Braintree, and so on) ✔️︎ Crash analysis and reporting ✔️︎ Google Maps, MapBox, GeoFencing. ✔️︎ Amazon AWS, Firebase Cloud services, Parse server ✔️︎ GitHub, Bitbucket, Trello, JIRA, Asana