Grega Radelj, Developer in Ljubljana, Slovenia
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Grega Radelj

Verified Expert  in Engineering

Full-stack Web Developer

Ljubljana, Slovenia
Toptal Member Since
August 20, 2019

Grega has several years of hands-on experience as a full-stack web developer. He started his career building complete custom CMS systems using PHP frameworks and now focuses primarily on building WordPress plugins and themes. Along with being a top-notch developer, Grega absorbs new information quickly and possesses excellent interpersonal skills.


KUPI d.o.o.
HTML, APIs, GitLab, WooCommerce API, Agile Software Development, WordPress API...
RD d.o.o.
WP-CLI, Firebase, Java, Android Studio, Android Development, Subversion (SVN)...




Preferred Environment

HTML5, Windows 10, PhpStorm, LAMP, GitLab, MySQL, jQuery, PHP

The most amazing...

...project I've worked on was a custom CMS system with a WYSIWYG editor and a lightweight-but-powerful web shop.

Work Experience

PHP Web Developer

2018 - PRESENT
KUPI d.o.o.
  • Developed and maintained multiple WordPress plugins and themes.
  • Built dynamic WordPress templates using the Advanced Custom Fields plugin.
  • Constructed WordPress landing pages, custom post types, and custom widgets.
  • Implemented various APIs, including Outdooractive API and Salesforce API.
  • Parsed weather data from the local weather stations using XML files.
  • Maintained and upgraded multilingual eCommerce sites using WooCommerce.
  • Developed and maintained various custom-built WooCommerce extensions.
  • Converted the existing monolingual websites to multilingual websites using the WordPress Multilingual Plugin (WMPL).
  • Migrated websites between various hosting services.
  • Improved response times of websites by optimizing the code, queries, and assets.
Technologies: HTML, APIs, GitLab, WooCommerce API, Agile Software Development, WordPress API, API Development, CSS, WordPress Themes, Advanced Custom Fields (ACF), Responsive Design, Payment APIs, Adobe Photoshop, Videos, Web Performance Optimization (WPO), Google APIs, Responsive Web Design (RWD), Object-oriented Programming (OOP), Responsive, Elementor, Ajax, Responsive Web Apps, Divi, C#, REST APIs, Bootstrap, WordPress Rescue, WordPress Plugins, TCPDF, Subversion (SVN), WordPress to PDF, WP Engine, eCommerce, Angular, Android, User Experience (UX), User Interface (UI), PhpStorm, WP-CLI, Git, jQuery, JavaScript, SCSS, CSS3, HTML5, PHP, WooCommerce, WordPress

Web Developer | IT Technician

2011 - 2018
RD d.o.o.
  • Developed custom CMS systems using PHP and CodeIgniter framework.
  • Built and maintained a web application for printer services.
  • Created and maintained a multisite where users could create their own websites using some preinstalled themes and plugins.
  • Built numerous WordPress and a few Joomla websites.
  • Migrated multiple websites built with Joomla to WordPress.
  • Developed a custom modular CMS system with a WYSIWYG editor, a small but powerful webshop, and a theme and plugin system similar to WordPress.
  • Developed and maintained eCommerce sites using WooCommerce.
Technologies: WP-CLI, Firebase, Java, Android Studio, Android Development, Subversion (SVN), Divi, User Experience (UX), User Interface (UI), eCommerce, PSD to WordPress, Responsive Web Apps, API Development, Windows 10, Joomla, Google APIs, Adobe Photoshop, Videos, Payment APIs, WordPress Multisite, SCSS, Web Performance Optimization (WPO), Model View Controller (MVC), Responsive Web Design (RWD), Object-oriented Programming (OOP), Responsive, HTML, Elementor, Ajax, APIs, Responsive Design, Advanced Custom Fields (ACF), LAMP, Git, GitHub, GitLab, WooCommerce, WordPress, Agile Software Development, WooCommerce API, WordPress API, MySQL, REST APIs, jQuery, Bootstrap, CodeIgniter, JavaScript, PHP MVC, CSS3, HTML5, CSS, WordPress Rescue, PHP, WordPress Themes, WordPress Plugins

A portfolio website with a custom theme. I was the back-end and the front-end developer on this project. The client provided the design with detailed instructions made in Adobe XD and I converted it into a WordPress theme. I used Ninja forms for the contact form, Mailchimp for the newsletter and the admin was built using Advanced Custom Fields. Other than that everything on the site is custom built.

Custom Products for WooCommerce

Worked on my own personal project, which is an extension for WooCommerce that adds a new level to the product-attribute hierarchy. The plugin includes multiple shortcodes, a WYSIWYG SVG image editor, customization fees, attribute images, and much more.

WP Dev Helper
This is an Android app that I created with Android Studio and Java to track statistics, ratings, and support forum for my (or any other) plugins published in the WordPress plugin repository. It obtains live data from the WordPress API and presents them in a mobile-friendly way.

Kozmetična sobica pri Nini
I designed and developed this website for a beauty salon owner. I built it with a Divi child theme; I also made the design, created all effects (parallax, transitions, etc.), the accordion section on the homepage, and more.
2009 - 2011

Bachelor's Degree in Media Production

Inštitut in akademija za multimedije - Ljubljana, Slovenia

AUGUST 2019 - AUGUST 2022

PHP and WordPress



Google APIs, API Development, jQuery, REST APIs, WordPress API, WooCommerce API


Advanced Custom Fields (ACF), Android Studio, GitHub, PhpStorm, WP-CLI, GitLab, Adobe Photoshop, Subversion (SVN), Git, TCPDF


PHP, CSS, HTML, Java, JavaScript, CSS3, SCSS, HTML5, C#


PHP MVC, CodeIgniter, Bootstrap, Angular, Divi


WordPress, WooCommerce, LAMP, Android, Firebase, Joomla


WP Engine, MySQL


Responsive, Model View Controller (MVC), Web Performance Optimization (WPO), Object-oriented Programming (OOP), Agile Software Development, Responsive Web Design (RWD)


WordPress Plugins, WordPress Themes, PSD to WordPress, APIs, Elementor, Responsive Design, Android Development, Windows 10, Responsive Web Apps, User Interface (UI), User Experience (UX), eCommerce, WordPress Multisite, Ajax, WordPress Rescue, Payment APIs, Videos, WordPress to PDF

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