Hire the Best Linux System Administrators
in Ukraine

⭐️ Top Rated Plus - Top 3% Expert on Upwork 🕒 9000+ Working Hours ✅ 20+ Years of Expertise ✅ 100% Job Success ✅ 300+ Successful Projects Finished ✅ 5 Star Rating Hello, I'm Oleksandr. As a seasoned Linux System Administrator and DevOps Engineer with over 20 years of experience I specialize in delivering robust IT solutions that enhance operational efficiency and security. My expertise spans across various domains, including: ▪ DevOps & Automation: Successfully implemented automated provisioning using Ansible, streamlining deployment processes and reducing manual intervention. ▪ Linux & FreeBSD Maintenance: Managed and optimized server environments on CentOS, Debian, Ubuntu, RHEL, and FreeBSD, ensuring high availability and performance. ▪ Cloud Hosting: Deployed and maintained scalable cloud solutions on AWS, Azure, and DigitalOcean, enhancing infrastructure reliability and scalability. ▪ Virtualization: Utilized Docker, VirtualBox, and OpenVZ to create flexible and efficient virtual environments, supporting diverse application needs. ▪ Web & Database Servers: Configured and maintained Apache, Nginx, MySQL, PostgreSQL, and MongoDB servers, ensuring secure and efficient data handling. ▪ Networking & Security: Implemented secure networking solutions, including VPNs and firewalls, to protect sensitive data and maintain network integrity. I am committed to continuous improvement and staying abreast of the latest industry trends. My approach is rooted in ITIL best practices, ensuring incident management and business continuity planning are at the forefront of my work. Let's collaborate to drive your IT projects to success with innovative solutions and expert guidance.

Linux System Administrator with hands-on experience at Namecheap, providing technical assistance for web hosting, domains, DNS, email configuration, website troubleshooting, and server-related issues. I specialize in helping clients solve hosting and website problems quickly and efficiently. My background includes working with cPanel, WordPress, SSL certificates, FTP, DNS management, email delivery issues, malware removal, website security, VPS and dedicated servers administration and general website support. I’m comfortable communicating with both technical and non-technical clients and always focus on clear explanations and fast resolutions. I am reliable, detail-oriented, and committed to delivering quality support and excellent customer service. Whether you need website troubleshooting, hosting migration assistance, DNS setup, or technical support, I’m ready to help.

More than 15+ year previous experience in Linux/Sysadmin/Hosting Design of High Availability/High-Performance services and architectures Ability to work flexible hours My primary experience (daily tasks) Server Setup/Migration/Transfer, Server Configuration, Server Optimization, Server Troubleshooting, Domain Registration, Domain Transfer, Domain Nameservers, Domain DNS Website Transfer, Website Migration SSL Install, SSL Renew, SSL Certificate Signing Request (CSR), SSL Let's Encrypt & Certbot Mail Transfer/Migration, Mail Delivery (SPF/DKIM/DMARC) Solid working knowledge of RPM/DEB based Linux Distributions: RHEL, CentOS, AlmaLinux, Rocky Linux, Oracle Linux, Fedora, Debian, Ubuntu, ArchLinux Experience with AWS EC2, AWS Lightsail, AWS RDS, AWS ROUTE53, AWS S3 Experience with RackSpace, DigitalOcean, Singlehop, Hetzner Dedicated, Hetzner Cloud, OVH, Godaddy Experience with Shared Hosting : JustHost, BlueHost, Hostgator, Godaddy, a2hosting, fatcow Experience with Control Panels: cPanel & WHM, Plesk, DirectAdmin, Virtualmin/Webmin, CWP (Control Web Panel) Software: Apache, Nginx, PHP-FPM, BIND, DHCP, Dovecot, Exim, Postfix, MySQL, iptables, ufw, CSF

🌐 Professional Cloud Engineer with Over 10 Years of Experience 💼 I am a seasoned Cloud Engineer with deep expertise in Linux, network engineering & administration, system engineering, and DevOps. With over a decade in the field, I bring a comprehensive skill set in system management, virtualization, and cloud infrastructure. 📌 Core Skills and Competencies: ✅ Multi-Cloud Architecture & Migration: AWS, GCP, Digital Ocean, Vultr, Hetzner 🚀 Automated Deployment: Ansible, Terraform 📦 Containerization: Docker, Kubernetes 💻 Scripting & Automation: Bash, Python 🔄 Continuous Integration: GitLab CI, GitHub Actions 🌐 Software (ERP/CRM/CMS): WordPress, Laravel, Joomla ⚙️ Linux Systems Administration: RedHat, Debian, Ubuntu 📊 Database Management: MySQL, MariaDB 📧 Mail Servers: Exim, Postfix, Dovecot, Spamassassin, Roundcube 🔧 Web Servers: Apache, Nginx, Varnish, Memcached, Php-fpm 🛠️ Hosting Panels: cPanel, WHM, Plesk, Webmin, VestaCP, ISPManager 📡 DNS Tools, CDN & WAAP: Cloudflare, Akamai 📈 Monitoring Tools: Zabbix, Cacti, Nagios 🌐 Networking: IP tools, Iptables, OpenVPN ⚠️ Note: Currently, I reside in a city affected by daily shelling. I am not accepting large-scale projects at the moment, but I continue to work and remain connected, supported by a generator, battery backup, and multiple internet providers. 🙏 Take care of yourself and your loved ones, and cherish every moment spent together.

I am skilled network/system administrator with more than 10 years of experience. If you need: - Install and configure backup and monitoring system - Install and configure fast and reliable web-server - Configure your network equipment - Install and configure Mail System for the Email Marketing purposes or any other server side work, please feel free to contact me.

I focus on building reliable systems and enjoy digging into complex issues — performance tuning, disaster recovery, root cause analysis, and solving problems that aren't always straightforward. With 20+ years in system administration and infrastructure engineering, I work with both legacy systems and modern environments — from bare metal servers to virtualized and containerized setups. 🚀 Key areas I work with: • Infrastructure setup and migrations (bare metal ↔ VM ↔ cloud) • Troubleshooting and performance tuning (high CPU/load, slow systems, bottlenecks) • Email deliverability (SPF, DKIM, DMARC, spam issues, warmup, mail server reputation restoration) • Virtualization and containerization (VMware, Proxmox, KVM, Docker) • Networking and VPN solutions • Disaster recovery, backup strategies, malware cleaning, and finding the point of intrusion. • Long-term systems support and maintenance 🛠 Legacy Systems & Industrial Equipment Support • Migration and virtualization of legacy systems (DOS, Windows 3.x/9x/NT/2000) • Running outdated software on modern hardware via virtualization • Recovery systems from old working HDD to VM, if native hardware fails. Including industrial PCs. 🔧 Core Expertise • OS: FreeBSD, Linux (CentOS, AlmaLinux, Rocky, RHEL, Ubuntu, Debian, Gentoo), Windows, Windows Server • Virtualization: VMware vSphere, ESXi, Proxmox, KVM, oVirt, VMware Workstation, VirtualBox • Containers & Automation: Docker, Docker Compose, Jenkins, Ansible • Web: Nginx, Apache, LiteSpeed, Tomcat, Lighttpd, Caddy • Databases: MySQL, MariaDB, PostgreSQL, MongoDB • Mail systems: Postfix, Dovecot, Courier Cyrus, Rspamd, Postgrey, PostfixAdmin, SquirrelMail, Roundcube, SPF, DKIM, DMARC, MTA-STS, AWS SES, Mailgun, Sendy • Control panels: WHM/cPanel, VestaCP, Virtualmin, Cyberpanel, and so on 🔐 Networking & VPN • WireGuard, AmneziaWG, OpenVPN, StrongSwan, tinc, mpd5, IPSec, L2TP, IKEv2 • BGP (quagga), Squid (including LDAP and Kerberos auth), DNS (BIND), DHCP, TFTP • Fail2ban, iptables, ipfw, pf, csf 💾 Storage & Backup • TrueNAS Core/Scale, FreeNAS, SAN (iSCSI), ZFS, AWS S3, Backblaze, Wasabi • Veeam Backup & Replication, XSI Backup, rsync, rsnapshot, rclone ⚙️ Other • Samba3 + LDAP, Samba4 (NT4 and AD domains analog, LDAP, domains up to 500 users, GPO, roaming profiles) • Monitoring: Zabbix, Prometheus, Grafana • Services: Memcache, Redis, OpenLDAP, NFS, SVN, Git, GitLab (self-hosted), FTP, SFTP • Platforms: Moodle, Nextcloud, OnlyOffice, BigBlueButton, DAViCal, WordPress, Magento • Remote management: AnyDesk, TeamViewer, Radmin, Ammyy Admin, RustDesk, MeshCentral • Hardware: Dell, HP, Supermicro servers, Dell PowerVault storages • Networking equipment: HP, Dell, 3Com switches • Embedded/firmware: DD-WRT, OpenWRT (including software cross-compiling for ARM) • Scripting: Shell scripting, Python, PHP Have an interesting or unusual problem? That's exactly what I enjoy — feel free to reach out. I value long-term collaboration and quality over quick fixes.