- Cyber Security & Penetration Testing: Vulnerability assessment, security auditing, and proactive defense strategies.
- Incident Response & Digital Forensics: Post-attack reconstruction, root cause analysis (RCA), and secure system recovery after a breach.
- Website Security & Hardening: DDoS & Brute force protection, Cloudflare, Sucuri, WAF, Imunify360.
- Self-Hosted AI Automation & Assistants: VPS setup, hardening, and maintenance of n8n, Activepieces, and OpenClaw — build unlimited AI workflows and run your own private AI assistant, fully self-hosted with all data on your server. No per-task fees, no third-party cloud. Security-first configuration (firewall, SSL, sandboxing, backups).
- Application Deployment & CI/CD: Self-hosted PaaS setup using Coolify — deploy full-stack applications, static sites, APIs, and databases directly from GitHub, GitLab, or Bitbucket. Automated SSL, Docker-based deployments, and one-click services (280+) on your own infrastructure. A secure, cost-effective alternative to Heroku, Vercel, and Netlify with full data ownership.
- Operating Systems (OS) Administration: Expert in Linux distributions: Ubuntu, CloudLinux, AlmaLinux, Rocky Linux, RHEL, and Debian.
- Web Server Management: Advanced configuration and tuning of NGINX, Apache, and LiteSpeed
- Website Performance & Speed Optimization: Specialist in Google PageSpeed Insights and GTmetrix (Mobile & Desktop tuning).
- Digital Tracking & Analytics: Expert setup of Google Tag Manager (GTM) and Google Analytics 4 (GA4), including custom event tracking and conversion setup for E-commerce.
- Hosting & Domain Administration: Migration, WHM/cPanel, StackCP, Webmin, Virtualmin, Cyberpanel.
- WordPress & WooCommerce: Website development (Elementor, Divi), maintenance, debugging, and malware removal.
- Object Caching & Database Optimization: Redis, Memcached, MySQL/MariaDB optimization.
- VPS & Dedicated Servers Configuration: AWS, Google Cloud, Digital Ocean, Hetzner, Contabo, Vultr, etc.
- DNS & Email Deliverability: Professional DNS management (SPF, DKIM, DMARC), Cloudflare Email Routing.
- Bulk Email Systems: Amazon SES, Mailgun, SendGrid, Postmark, Mautic, Sendy.
- Hosting Automation: WHMCS & Upmind (specializing in WHMCS to Upmind migrations).
- Content Protection: DMCA protection and SSL management.
- Service Excellence: 100% accuracy, fast response, and adjustable to all time zones.
Other:
Graphic Design: flyer, brochure, magazine, catalog, presentation, logo, font vectorization, preparing Files and Documents for Print (crop mark, trim line, bleed area, RGB to CMYK conversion, PMS Solid colors Pantone), Variable Data, Excel XML, minimalist design, wood engraving mockup, DST embroidery file conversion, Recover Corrupted videos, ads marketing
Photo Editing: manipulation, retouching, mockup, product photo editing, removal of background (hair, fur)
Video & Audio Editing: crop, noise reduction, warp stabilizer, montage, transitions, effects
My Resume:
-Disciplined, hard-working, responsible
-Used to having high responsibilities and constant improvement
-Good at adjusting to the team I'm in
-Extremely detailed, efficient, and quality work
Education:
- Electrical Engineering University of Niš, Serbia
Certificates:
- TryHackMe – Cyber Security
- Cisco CCNA (Network Associate Routing & Switching)
- Cisco End User: Network Security
- Ultimate AWS Certified Cloud Practitioner
- Proxmox VE 6
- Visual and Graphic Design
- Adobe Photoshop, Illustrator, InDesign, Premiere, After Effects
Apache HTTP Server
Amazon Web Services
WordPress
Web Server
LiteSpeed Web Server
NGINX
Redis
Web Hosting
Domain Name
DNS
Cloudflare
cPanel
WordPress Migration
Elementor
WooCommerce
Pavel S.
Novi Sad, Serbia
$60/hr
4.9
424 jobs
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.
Apache Administration
NGINX
VMware vSphere
Network Engineering
Web Hosting
Squid
Session Initiation Protocol
LAN Administration
MySQL
Firewall
Linux System Administration
WordPress
DNSsec
Asterisk
Nemanja V.
Belgrade, Serbia
$23/hr
5.0
2 jobs
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.
Linux System Administration
Windows Server
Oracle Database Administration
Server & Virtualization Software
Server Administration
System Automation
Apache Tomcat
Grafana
Milan B.
Kosjeric, Serbia
$100/hr
5.0
143 jobs
I'm a web developer and system administrator who has a professional attitude and commitment to work, I'm always looking for a way to be better, and to learn more and more.
What can I do?
★ All kinds of services related to WordPress sites (WooCommerce included)
★ All kinds of services related to Joomla sites
★ The building of static websites using HTML5 and CSS3 and/or Bootstrap
★ All kinds of services related to Magento, PrestaShop, and OpenCart
★ Linux System Administration (CentOS and Ubuntu preferred)
★ WHM Administration and Tweaks
★ Nginx, Apache & LiteSpeed Web Servers - Configuration and Tweaks
★ Vesta Control Panel - Setup, Update, and Tweaks for Stability and Efficiency
★ SSL installation and Setup on a Server and/or Website
★ MySQL/MariaDB (analyzing, creating, modifying, updating, and repairing)
★ Malware/Virus Removal from Server and/or Website
★ Speeding up Server and/or Website
★ Repairing Windows (Vista, 7, 8, 10)
★ Transferring/Moving Websites
★ Consultancy services
When it comes to working, what do I enjoy the most?
I enjoy solving problems, to deal with issues that most of the other developers and system admins can't, or wouldn't bother to figure out. I find a challenge in that, I find that interesting and fun. So if you have some problem, error, or bug - related to the server, hosting, or website - I would be glad to take a look.
HTML5
Magento
WordPress
CSS 3
Linux System Administration
PHP
MySQL
WooCommerce
cPanel
Elementor
WordPress Development
Page Speed Optimization
Nikola J.
Belgrade, Serbia
$100/hr
5.0
191 jobs
If your website is critical to your business, security and stability aren’t optional - they’re infrastructure.
I work with companies that rely on WordPress and WooCommerce in production environments, where downtime, attacks, or misconfigurations directly impact revenue.
With over 10 years of experience in WordPress, Cloudflare, and Linux server environments, I typically get involved in situations where things need to be handled properly - not patched temporarily.
What I focus on:
• Advanced malware remediation and full-site recovery
• Cloudflare architecture, WAF tuning, and traffic control
• Bot mitigation and DDoS protection at scale
• Linux server hardening and performance tuning (Nginx, Apache, MySQL)
• Stabilizing high-traffic WooCommerce environments
• Full-stack performance + security alignment
I approach every project from both sides - application and infrastructure.
That means understanding how WordPress behaves under load, how traffic is filtered at the edge (Cloudflare), and how the server handles what gets through. This is where most setups fail, and where I usually step in.
I’m a Top Rated Plus freelancer on Upwork with a 100% Job Success score, and I’ve worked with 150+ clients across hundreds of production websites, many of them long-term.
I don’t rely on generic solutions or one-size-fits-all setups. Every system is different, and I take the time to understand what’s actually happening before making changes.
If you’re looking for someone who can take ownership of security and stability, not just fix isolated issues - we’ll likely be a good fit.
✔ Fast response (usually within a few hours)
✔ Available for urgent fixes (including hacked or down sites)
✔ Careful work on live environments (no unnecessary downtime)
✔ Root-cause fixes, not temporary patches
JavaScript
PHP
Magento
WordPress
Laravel
WordPress Plugin
MySQL
Web Hosting
Amazon EC2
Linux System Administration
Linux
Amazon
Cloudflare
Cloud Architecture
Marko T.
Belgrade, Serbia
$30/hr
5.0
47 jobs
Expert DevOps and Full Stack Engineer with
More than 6 years of experience as a Cloud Architect. DevOps expert
with a focus on deploying cost effective microservices based solutions in the
cloud and local machines ,that can meet the demands of your application while being able to scale.
My ability to not only deliver on solutions but also interact like a pro in customer facing situations, makes me an ideal part of any clients team.
Whether you need to migrate your workloads to the cloud, optimize your
application, well-architect highly-available cloud infrastructure, or automate
pipelines and deployments, I have the experience and expertise to help.
With most of my projects, I am responsible for everything from ground up. This,
of course, includes the development lifecycle, automated release pipelines,
automated deployments, version control, and Infrastructure-as-Code. I have vast
experience with designing and developing system architectures in Amazon Web
Services, Microsoft Azure, and Google Cloud.
Have knowledge of technologies which include Docker, Kubernetes, ECS, Azure,
Jenkins, Elasticsearch, RDS Aurora, and Terraform, Cloudformation, I am also
experienced in Azure devops , Codepipeline, Codebuild, and Ansible.
Apache Administration
NGINX
Linux System Administration
Ubuntu
Network Administration
Bash
Python
System Administration
Amazon Web Services
Docker
CI/CD
Azure DevOps
Kubernetes
Terraform
Ansible
Server
CentOS
VMWare
Jenkins
Application Release Automation
Google Cloud Platform
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