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
Sasa K.
Belgrade, Serbia
$40/hr
5.0
215 jobs
Ever since I was a kid, I've been fascinated by computers. I was introduced to Linux almost 15 years ago, and that was the time I discovered my first true passion.. I worked as a software developer (iOS - Swift) and Linux system administrator, but I wasn't satisfied with neither developing corporate/commercial applications, nor repeating same routines like adding/removing users, setting up VPSs, configuring programs following the same conventions.. I needed something to satisfy my passion for creativity and problem solving/algorithmic/programmatic thinking, but that is still related to Linux.. Enter Bash, an amazing way to interact and utilize full potential of your Unix OS in a totally programmatic manner..
I've been perfecting my Bash skills for over 5 years now, and I have quite a lot of complex projects, successful jobs and happy clients to support that..
I'm also quite proficient with Python as well, but given my stand on mainstream appliances, I'm only interested in jobs utilizing core principles, I DON'T have any "domain-specific" skills, so please DON'T contact me about AI/Machine Learning/Trading/Full stack/bot automation etc, only basic python skills..
That being said, if you're looking for a Linux expert who thinks of Bash as a programming language and vim as an IDE, feel free to reach out and I'd be happy to provide my services! :)
Python
Git
Bash Programming
Regex Writing
Unix Shell
Awk
Linux
Vim
Unix
Bash
Marko A.
Belgrade, Serbia
$50/hr
5.0
67 jobs
🎯 I turn repetitive video production into automated pipelines that run without anyone touching them — subtitling, encoding, and template-driven video generation for media companies, broadcasters, and content creators.
⭐ Top Rated · 100% Job Success · 54 projects delivered · 5.0 · 13+ years in broadcast engineering
Using FFmpeg, Python, Node.js, React, Remotion, After Effects scripting, Whisper AI, and n8n, I've built high-throughput FFmpeg pipelines (CPU & GPU — NVENC/CUDA), API-driven After Effects rendering systems, and AI-powered speech-to-text captioning workflows. If it's a repetitive video task, I turn it into a script that scales.
▸ WHAT I AUTOMATE FOR YOU
• After Effects — JSX/ExtendScript, aerender pipelines, template-driven video generation
• AE → Remotion pipelines — convert After Effects templates into server-side React/Remotion renders (props for text, image, video, alpha overlays; multi-language output)
• FFmpeg — encoding, compression, watermarking, format conversion (NVENC/CUDA)
• Video generation APIs — automated rendering pipelines & queue systems (Remotion, Node.js, FastAPI)
• Subtitles & captions — generate, convert, burn-in (SRT, WebVTT) powered by Whisper AI
• n8n workflows — connecting your tools into one hands-off automated flow
• Live production — OBS/vMix consulting, ATEM switching, Blackmagic DeckLink integration
• Playout & ingest — SDI and file-based/IP workflows
• Media asset management — LTO archiving & long-term storage
▸ WHY CLIENTS KEEP HIRING ME
• 13+ years in live broadcast — I've shipped under real deadlines, not just in theory
• Led a team of 13 engineers — I document properly and deliver production-ready systems
• Performance-obsessed: GPU acceleration, parallel processing, efficient encoding
• I speak both "editor" and "engineer" — bridging creative workflows and backend automation
🌍 Based in Serbia, working with clients worldwide.
🚀 Tell me the repetitive task eating your time — I'll show you how to automate it. Send me a message and let's scope it out.
Adobe After Effects
FFmpeg
Python
vMix
Video Conversion
Broadcast Engineering
Video Processing
n8n
Raspberry Pi
FastAPI
API Development
DCP-o-matic
Node.js
React
Linux
SQLite
Automation
Rust
JSON
Firebase
Aleksandar S.
Belgrade, Serbia
$45/hr
5.0
396 jobs
More than 20 years of working experience in networking and server administration.
Administering and scripting networking applications, database applications, web applications and internet & intranet servers
In position of expert engineer for networking infrastructure, IT security expert and senior linux/windows/OSX administrator
In charge of designing of LAN/MAN/WAN networking infrastructure, designing and implementation of fiberoptic backbone and copper networking installation.
Administration of linux servers and networking devices (switches, routers, firewalls, NAS) am in charge of more than 150 linux servers, both physical and virtual
Working with L2/L3 switches, routers, firewalls, NAS devices, switching&routing protocols (RIP, OSPF, SNMP, IGRP/EIGRP, VTP, BGP).
Certified Cisco and Mikrotik networking engineer.
OS platforms - Red Hat/Centos, Debian/Ubuntu, Gentoo, OpenSolaris, BSD flavors, Windows, OSX Server.
Networking equipment - Cisco, HP, Mikrotik, ZTE, Huawei
Some of the open-source technologies and daemons I have experience with:
- bash, perl and python scripting
- apache/nginx web servers (standalone, or in backend mode for tomcat, with one or many virtual hosts)
- mysql/postgresql database installation and administration
- squid (with or without dansguardian+clamav as content filter/realtime AV)
- cloud (openstack, AWS, Azure, gcloud, OVH, rackspace, digital ocean....)
- snort (with BASE and Snorby as web GUI) and suricata IDS
- iptables (with or without web GUI) - BIND (standalone or master/slave)
- postfix (as MTA, combined with alot of different tools such as spamassassin, amavis, clamav, roundcube, postfixadmin, dovecot, cluebringer, mailgraph)
- zenoss, zabbix and cacti (with plugins and OUIs)
- dovecot (as pop3/imap server of choice, combined with postfix and amavis, clamav, roundcube, postfixadmin, spamassassin)
- amavis (with alot of customized settings for things such as double AV scanning, DKIM support, catching of spam headers...)
- spamassassin (standard and heuristic bayesian analysis, fine tuning of scoring, OCR integration, SPF integration....)
- ClamAV (using both standard and unofficial virus definitions, making of 0-day virus signatures caught in the wild...)
- freeradius (with MySQL backend for AAA)
- samba (in all possible variatons
- standalone simple CIFS sharing, member of windows AD, standalone AD controller, one of the controllers in windows AD)
- pureftpd, vsftpd and proftpd (as standalone servers or with virtual users)
- xen, vmware, hyperv and kvm virtualization (stock or Xenserver/Proxmox distributions)
- asterisk (via Elastix linux distribution)
- roundcube as preferred web-mail interface (with alot of customized plugins)
- openmediavault/openfiler linux distros for NAS
- HA clustering (failover based on DRBD and heartbeat/pacemaker+corosync)
- NUT (daemon for UPS monitoring and controlling)
- openvpn (with various configurations and backends)
- pptp vpns (with various configs and backends)
- all kind of linux distributions - RH, CentOS, openSuSe, Debian, Ubuntu, Gentoo, Arch....
- hardening of linux distributions (iptables, fail2bain, allow/deny mechanism, AIDE, SELinux, AppArmour, occasional pen testing)
- puppet automation
- rancid (centralized backup of config files)
- bacula, urbackup and rsync backup
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