Hire the Best Unix Developers

⭐ 100% Job Success | 🌟 Rising Talent | 🚀 Linux & DevOps Engineer I help founders and developers deploy, fix, and scale their infrastructure. From broken Docker containers and Nginx issues to full VPS deployments with SSL and CI/CD — I focus on solving real infrastructure problems fast and cleanly. What I work with: • Docker & Docker Compose • Linux / Ubuntu servers • Nginx & reverse proxies • CI/CD pipelines • Cloud & VPS deployments • FastAPI & PostgreSQL • Kubernetes basics • Infrastructure troubleshooting I already have hands-on experience maintaining Linux infrastructure, deploying web services, configuring SSL, and troubleshooting production issues. If your app needs deployment, debugging, or a stable server setup — I can help.

⭐️ 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.

Looking for challenging new projects which can effectively use my talents and creativity, to generate cost effective software solutions. I'm a world class C programmer (primarily on Unix/Linux) and I'm used to making "impossible" tasks "possible". I have a great deal of expertise in: * real time embedded systems * cross compilation/software construction * source control * network programming * system administration * kernel level programming/device drivers * image processing * performance and metrics

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 am an experienced Linux administrator. I have 15+ years of experience in Linux system administration and problem-solving. I can troubleshooting all kinds of linux issues, centos migration, centos/ubuntu crash rescue, investigate server performance issue and web server administration. Skills & Deliverables: Cloud Infrastructure & Dedicated VPS Setup (AWS, DigitalOcean, Hetzner, Contabo, Linode etc) Building secure, high-performance servers with proper backup, and automation. Linux Administration(Centos, Ubuntu, Debian, Rocky Linux, Almalinux) Performance optimization, monitoring, troubleshooting, log analysis, and uptime management. Server migration(Centos, Ubuntu, Debian, Rocky Linux, Almalinux) Secure migration of data and app between different servers. Web Server Trouble-shooting Slow server, website troubleshooting and optimization Recurring downtime issue troubleshooting and fix. Centos7 server migration Upgrade centos7 to almalinux 8 or 9. Migrate data&apps from centos7 to Ubuntu/Debian/Rocky/Almalinux Server Upgrade(Centos, Ubuntu, Debian, Rocky Linux, Almalinux) Upgrade ubuntu 14 16 18 20 22 to the latest version. Upgrade Debian , Rocky Linux, Almalinux to the latest version Server rescue(Centos, Ubuntu, Debian, Rocky Linux, Almalinux) Fix linux system crash, file system corruption. Security & Compliance Firewall configuration, access control, TLS/SSL, patching, vulnerability prevention. Backup & Disaster Recovery Strategy Automated backups, retention policies, restore testing, failover planning. Application Hosting & Migration WordPress, Prestashop, Forum app, Node.js, Python apps — smooth migration without downtime. Email Infrastructure & Deliverability Improvement Domain authentication setup (SPF / DKIM / DMARC), inbox placement, fixing spam issues. Why choose me? - Strong skills and extensive experience , can work independently and efficiently , able to fix complex issues - Fast and clear communication, detail and solution oriented - Honest and proactive work ethic

Hello. I am currently developing new AI and machine learning techniques. I have expertise in many technologies and languages for web, desktop, server, and embedded applications (13 years). Unusual among developers, I have artistic prowess, with experience in UI/UX and 3D animation. Additionally, a breadth of theoretical knowledge in computer science, data science, and other areas of mathematics makes me a perfect choice to solve your more complex problems. I have built the amazing software - batch job scheduler for optimizing resource usage on supercomputers. In my previous company, I achieved these goals. - Designed novel deep learning architectures and high-performance software to forecast the stock market. Made a high-performance C++ data pipeline with a custom-built database. Developed models in Python and Node.js, with TensorFlow for deep learning. - Performed research on intelligent matchmaking in dating apps. New GAN and autoencoder architectures were designed to learn facial preferences in a disentangled space. Used TensorFlow and Python. Developed the front-end in Svelte and vanilla JavaScript. - Developed artificial intelligence for a tennis-playing robot. Researched new computer vision techniques for ball and court localization in a simulated environment. Prototyped novel CV algorithms with a custom-built C++ framework. - Researched the development of AGI, new unsupervised learning theories, and unconditional input data mining. Developed a C++ framework for prototyping new learning techniques. - Architected a highly parallel resource scheduler for supercomputing clusters. I used OpenMP C++ for the back-end, with Node.js bindings to integrate with a web front end. Scripted in C and Node.js to integrate with Unix systems. My Experience. - Snow Simulation This implements a technical paper for material-point-method snow simulation. It is written in C++ and employs OpenGL, Eigen, FreeImage, and Houdini. - Speed Reading Web App The application helps you learn to speed-read books. It darkens the text you should be reading to keep up with your target WPM. - Flowcharts Web App This application is used to create flowcharts for organizing textual information. It integrates with Google Drive and uses IndexedDB for local content. - Racko AI This project is a collection of artificial intelligence for playing the card game Racko. I developed an AI that is competitive with human players—using deep learning and temporal difference learning. I also created a game UI in Java. - Vanilla Dice A 2D physics-based dice rolling simulator for D&D and tabletop games, made in SwiftUI and SpriteKit. I designed and created the app from start to end. It's currently in public beta through Apple's TestFlight. I am very familiar with these technologies. User Interface (UI/UX) - 12 years JavaScript - 11 years Algorithms - 9 years Node.js - 8 years Data Structures - 8 years C/C++ - 7 years MongoDB - 7 years Python - 7 years Machine Learning - 7 years C# - 7 years Agile - 6 years Scrum - 6 years Object-oriented Design (OOD) - 5 years I am passionate about elegant design and efficient development. I deliver pixel-perfect features with precision and care. Looking forward to working with you. Thanks.