Hire the Best System Administrators
in Serbia

From idea to a working system. I help define what needs to be built, develop the application, and prepare the infrastructure to run it. If an existing system isn't working properly, I investigate the cause and fix it. I have over 15 years of professional experience across software development and systems administration. I've worked with ISP networks, payment systems, hosting, and business applications. I understand how code, databases, servers, and networks fit together, and can handle the complete technical implementation of a project. From business idea to launch You can come to me with a description of your problem without a finished specification. I'll help you work through the business process, define the requirements, and put together an implementation plan. I take on projects of different sizes, from a small website or a single automation task to a complete product with its own infrastructure. I can work out user flows and build the interface using an existing template. If you need custom visual design, that part is best handled by a designer. For an ISP, I implemented the technical side of an in-house payment terminal system so customers could pay at locations and times convenient for them. My work covered terminal configuration and monitoring, a PHP payment gateway, payment processing, logging, reporting, and integrations with other service providers. Infrastructure, DevOps, and hosting For clients, I've built and maintained development and production infrastructure, including GitLab, Redmine, SonarQube, NGINX-based application servers, containers, and virtual machines. I've worked with Linux, Docker, VMware, Proxmox, and Vagrant. A substantial part of my experience involves AWS, including serverless solutions, Lambda, and Aurora. I've also worked with cPanel hosting and automated hosting maintenance. Over my career, I've migrated thousands of WordPress websites of varying complexity. I know PHP and WordPress internals well, have written plugins, maintained websites, and resolved technical issues. I can help with migrations, custom functionality, WooCommerce stores, and integrations. When something isn't working and the cause isn't clear A website won't load, a server returns an error, or email won't send - these requests have been a regular part of my work. I start with the symptoms, check the basic assumptions, find and fix the cause, and recommend measures to prevent the problem from recurring. When documentation isn't enough, I investigate system behaviour through logs, network traffic, profiling, and debugging. My experience in both development and operations helps me troubleshoot problems that span multiple components. Development and tools For new projects, I currently prefer Rust and TypeScript for their strong typing and support for automated testing. I've written code in many languages over the years, so I can also work on existing projects with different stacks and investigate unfamiliar code. I'm particularly interested in reverse engineering, low-level debugging, and game modding. I've developed mods and gaming tools, and run and maintained my own game servers. I also have experience with C#/.NET and Unity. I use AI tools, automation, and testing to investigate code, develop solutions, and verify the results. How I work I prefer fixed-price projects with specific, agreed deliverables. If the scope isn't clear yet, we start with a paid investigation or requirements phase, then determine the implementation cost. I'm also open to long-term collaboration: developing a system beyond its initial launch, adding functionality, and helping with operations. Tell me what you want to build or what isn't working. We'll work through it and determine the next step.

Linux System Administrator and DevOps Engineer with hands-on experience supporting production environments, deployment automation, CI/CD pipelines, and enterprise infrastructure. Experienced with Linux server administration, Jenkins automation, Oracle-based environments, middleware support, and infrastructure troubleshooting in production systems. What I can help you with: Linux server administration (Oracle Linux, Ubuntu) CI/CD pipeline setup and maintenance Jenkins automation and deployment workflows Docker deployments Oracle & PostgreSQL administration WebLogic / GlassFish middleware support Infrastructure automation with Bash and Ansible Production troubleshooting and performance analysis Git / SVN administration and deployment workflows Nginx / Apache configuration Technologies: Linux, Oracle Linux, Ubuntu, Jenkins, Docker, GitLab CI/CD, Oracle Database, PostgreSQL, Bash, Ansible, Nginx, Apache, SVN, Git, WebLogic, GlassFish I focus on reliable infrastructure, stable deployments, fast issue resolution, and clear communication.

I help businesses implement secure monitoring platforms, troubleshoot complex infrastructure problems, recover compromised systems, and stabilize production environments across Linux, Windows, VMware, Hyper-V, and Oracle technologies. My recent work includes the implementation and final validation of a secure Zabbix-based MSP monitoring proof of concept. The project covered application configuration, MSP standardization, onboarding of the initial reference environment, Windows and Linux monitoring, Zabbix Server and Proxy communication, Agent 2 deployment, PSK-encrypted connections, templates, triggers, maintenance periods, and helpdesk alerting. Core areas I can help with: • Zabbix Server, Proxy, Agent and Agent 2 implementation • Secure host onboarding using PSK encryption • Windows and Linux infrastructure monitoring • Templates, items, triggers, macros and host configuration • Alerting, email notifications and helpdesk integration • Maintenance periods, history and data-retention configuration • VMware ESXi, vSphere, Hyper-V and virtual machine troubleshooting • Linux and Windows Server administration and hardening • Oracle database administration and connectivity troubleshooting • Security incident investigation, malware cleanup and recovery • SSL/TLS certificate troubleshooting • PowerShell, Bash and infrastructure automation I work methodically, communicate clearly throughout the engagement, and document important configuration decisions. My focus is not only on resolving the immediate issue, but on delivering a secure, maintainable solution that can be operated reliably after handover. Recent client results include: • Secure Zabbix MSP monitoring proof of concept successfully implemented and validated • Compromised Ubuntu and WordPress infrastructure containing 155+ websites recovered and hardened • Hyper-V virtual machine memory and performance issues diagnosed and stabilized • VMware ESXi 5.5 certificate issue resolved after previous unsuccessful attempts If you need help with Zabbix monitoring, infrastructure troubleshooting, virtualization, server security or production systems support, feel free to send me a message.

I am a Computer Engineering graduate and I have been working in the IT industry a little less than a decade now. I take great pride in never once leaving a problem unsolved or disappointing a client. I am punctual and easy to work with. Dedicated and curious bug hunter. My fields of expertise are: 💻 Windows environment 7/8/10 💻 Software installation and maintenance 💻 User Account Control - UAC 💻 Networking (making - troubleshooting Wi-Fi / LAN) 💻 Office packages (installation and work in packages) 💻 VMware, HyperV (installing, making, troubleshooting) 💻 Printer troubleshooting Beginner Skills: ► Beginner of MikroTik configuration ► Beginner of C ++ ► Beginner of SQL ► Beginner of WordPress ► Beginner of PHP,HTML,CSS ► Windows Server 2016 ► Linux server My suggested workflow (briefly) : ► Receiving problem ► Initial analysis of the problem and preparation ► Establishing a connection to the remote computer (via TeamViewer, or something else) ► Troubleshooting/Solving the problem ► Chat with the user ► Review ► End of work

Skilled System Administrator and Network Engineer with over 20 years of hands-on experience, adept at organizing networks for single-office environments or multiple offices connected via VPN. I am highly proficient in Unix system administration (Linux and FreeBSD), covering DNS, DHCP, LAMP/LEMP, FTP, SMTP, SNMP, ACLs, firewalls, and NAT, BGP. My expertise also extends to major cloud platforms (AWS, Vultr, DigitalOcean) and virtualization technologies (vSphere, Hyper-V, Proxmox), as well as monitoring tools (Zabbix) and VoIP/IP telephony systems (Asterisk, FreePBX). Here is what past clients have said about my work: - “Pavel was fantastic! My project hit a snag and I needed an FTP server configured quickly. He jumped in immediately, resolved the issue in no time, and answered all my questions in a friendly manner. This guy is a real problem solver!” - “Very smart when it comes to Linux systems—was able to help with our issue.” - “A very skilled and professional expert who solved all additional and unexpected problems with patience. He overdelivered, and I highly recommend working with him!” - “The problem was solved quickly and efficiently.” - “Pavel did a great job tracing the problem and solving it.” - “Pleasure to work with.” I take pride in my ability to quickly diagnose issues, implement reliable solutions, and consistently exceed client expectations.

System administrator at the Faculty of Electronics in Nis, eager for challenges and work. Troubleshooting, software servicing and user support. Also serviced mobile phones, software and hardware.