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Multi-discipline system engineer with more that 25 years of experience on Linux/Unix, networking, high performance computing and high availability / high reliability systems. Interested in: - Building large scale high-loaded web platforms running in heterogeneous environment - High performance networking with SDN/NFV - Embedded development and wireless technologies, mostly small-sized and power-efficient (IoT, etc).

⭐️ 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.

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!

I focus on building reliable systems and enjoy digging into complex issues — performance tuning, disaster recovery, finding root causes, 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 (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.

US-Based. Ex-Google Senior Systems Engineer. I have over 25 years of running Linux infrastructure, websites, system administration and technical services. I can help with: * Linux server troubleshooting, setup & security (CentOS, Ubuntu, Alma, Rocky, etc.) * Apache & nginx web servers * MySQL & MariaDB SQL servers * Email services (dovecot, exim, sendmail) * PHP, Golang, Python programming, Bash scripting * SSL certificate issues * DNS issues * Wordpress issues * Server & website migrations. * VPI/PBX: Asterisk, Kamailio, Twilio, etc. * Compiling software * Web hosting control panels (including cPanel/WHM, etc) * GCP & AWS management * Networking: VPNs, VLANs, routing, switching, DHCP, PXE, BGP, etc * SRE, Devlops, monitoring & logging, etc. After running a web hosting company for 17 years and then working as a systems engineer at Google for 7 years I am now ready to help you with your internet & website infrastructure. I live in the US, work in the Eastern Time Zone and I am available via email, WhatsApp, phone or video calls. If you need a trusted partner to work with your website or infrastructure, then look no further :)

𝗗𝗲𝘃𝗢𝗽𝘀 & 𝗔𝗜 𝗔𝘂𝘁𝗼𝗺𝗮𝘁𝗶𝗼𝗻 𝗦𝗽𝗲𝗰𝗶𝗮𝗹𝗶𝘀𝘁 ⭐ | 𝗦𝗰𝗮𝗹𝗮𝗯𝗹𝗲 𝗔𝗪𝗦 𝗦𝘆𝘀𝘁𝗲𝗺𝘀 | 𝗙𝗮𝘀𝘁 𝗗𝗲𝗹𝗶𝘃𝗲𝗿𝘆 | 𝗣𝗿𝗼𝗱𝘂𝗰𝘁𝗶𝗼𝗻-𝗥𝗲𝗮𝗱𝘆 𝗦𝗼𝗹𝘂𝘁𝗶𝗼𝗻𝘀. 𝗪𝗵𝗮𝘁 𝗜’𝘃𝗲 𝗗𝗲𝗹𝗶𝘃𝗲𝗿𝗲𝗱 (𝗥𝗲𝗮𝗹 𝗜𝗺𝗽𝗮𝗰𝘁): ✔️ Deployed scalable AWS infrastructure (EC2, S3, Load Balancers, Route53) with production-ready CI/CD pipelines using GitHub Actions, Jenkins, GitLab CI ✔️ Automated complex workflows using n8n, APIs, and AI systems (OpenAI / Claude), reducing manual work by 60%+ ✔️ Delivered end-to-end deployments for web & mobile apps (Node.js, React, Next.js, Android/iOS backends) across AWS, DigitalOcean, Google Cloud & VPS environments ✔️ Migrated hosting from GoDaddy, Hostinger, cPanel to optimized cloud/VPS setups, improving performance, security & cost efficiency ✔️ Implemented and managed CMS & E-commerce platforms (WordPress, Magento, OpenCart, Strapi) with secure production deployments ✔️ Set up and maintained open-source business tools including ERPNext, Nextcloud, EspoCRM, Keycloak, Coolify, n8n, and other Ubuntu-based solutions ✔️ Built and deployed systems using Docker, Terraform, Ansible, ensuring scalable and repeatable infrastructure ✔️ Configured Nginx, Apache, reverse proxy, Cloudflare, DNS, SSL, and handled complex domain routing & security ✔️ Monitored and optimized servers with logging & alerting, and resolved critical production issues (CI/CD failures, SSL errors, server crashes, VPN/network issues) ✔️ Developed and deployed Python/FastAPI-based systems, AI tools, LMS platforms, and LLM-powered automation solutions 🚀 What I Do Best ⚙️ 𝗗𝗲𝘃𝗢𝗽𝘀 & 𝗔𝘂𝘁𝗼𝗺𝗮𝘁𝗶𝗼𝗻 I design and manage end-to-end automation pipelines that make deployments fast, reliable, and repeatable. . CI/CD pipelines using GitHub Actions, Jenkins, GitLab CI, Bitbucket . Infrastructure as Code with Terraform & Ansible . Docker-based environments for consistent dev-to-production workflows . Workflow automation using n8n, APIs, cron jobs ☁️ 𝗖𝗹𝗼𝘂𝗱 & 𝗜𝗻𝗳𝗿𝗮𝘀𝘁𝗿𝘂𝗰𝘁𝘂𝗿𝗲 I build secure, scalable, and production-ready cloud architectures tailored to your application needs. . AWS: EC2, S3, IAM, VPC, Load Balancers, Route53 . Multi-cloud: DigitalOcean, Google Cloud, all VPS providers . DNS management, Cloudflare integration, reverse proxy setups . High-availability, secure, and cost-optimized architecture design 🌐 𝗗𝗲𝗽𝗹𝗼𝘆𝗺𝗲𝗻𝘁 & 𝗖𝗠𝗦 / 𝗘-𝗖𝗼𝗺𝗺𝗲𝗿𝗰𝗲 I handle complete deployment lifecycle for modern apps, CMS, and e-commerce systems. . Frontend & backend deployment: Node.js, React, Next.js . CMS platforms: WordPress, Strapi (Headless CMS) . E-commerce: Magento, OpenCart, custom setups . Mobile backend deployment for Android & iOS apps 🧠 𝗔𝗜 𝗔𝘂𝘁𝗼𝗺𝗮𝘁𝗶𝗼𝗻 & 𝗕𝗮𝗰𝗸𝗲𝗻𝗱 𝗦𝘆𝘀𝘁𝗲𝗺𝘀 I build AI-powered automation systems that streamline workflows and improve business efficiency. . n8n + OpenAI / Claude integrations . AI agents & multi-step workflow automation . Backend systems using FastAPI / Python . LLM-based tools, APIs, and intelligent automation solutions 🐧 𝗟𝗶𝗻𝘂𝘅, 𝗦𝗲𝗿𝘃𝗲𝗿 & 𝗢𝗽𝗲𝗻 𝗦𝗼𝘂𝗿𝗰𝗲 𝗘𝘅𝗽𝗲𝗿𝘁𝗶𝘀𝗲 I manage and optimize Linux-based production environments with strong focus on stability and performance. . Ubuntu server setup, optimization & security hardening . Web servers: Nginx, Apache, reverse proxy configuration . Server troubleshooting, monitoring & performance tuning . Deployment of open-source tools: . ERPNext, Nextcloud, EspoCRM, Keycloak . LMS platforms, CRM systems, and business tools 💡 How I Work ✔️ I build automation-first systems to reduce manual effort and human errors ✔️ I focus on scalable, secure, production-ready infrastructure ✔️ I quickly diagnose and fix real-world production issues ✔️ I deliver clean, well-documented, and maintainable solutions 🎯 Ideal Projects AI Automation Systems (n8n + APIs + LLMs) AWS / Cloud Infrastructure Setup & Optimization CI/CD Pipeline Design & Implementation Website & App Deployment (React, Node, CMS, Mobile) Server Migration & Performance Optimization Fixing Production Issues (SSL, DNS, Docker, CI/CD, VPS) 📩 Let’s Work If you're facing: 👉 Deployment or server issues 👉 Manual processes that need automation 👉 Cloud infrastructure challenges 👉 AI workflow or automation ideas Send me your details , I’ll respond with a clear solution, timeline, and execution plan.