Ervin Domonkos

A premium WordPress plugin that automates the sales process of event organizers, training sessions, and consulting businesses. I was the project owner completing all the development with occasional help in design and marketing by contractors. The project involved coding integration with several popular APIs, writing Gutenberg blocks, creating a complex plugin settings page, and setting up a complete license management system behind it.

A full website built using WordPress and Gutenberg blocks for a travel blogger and writer. A challenge in the project was that we had to unify two previously separate websites to make the new site more powerful in terms of SEO. The new site received a fresh new look that aligned with the client's personality and message.

A worldwide learning platform client used The Events Calendar (TEC) plugin for managing their online events. However, the TEC plugin always showed the start and end times to its users in a pre-set time zone. The client wanted to show all events in the local time zones of the users.

The solution was an add-on plugin that detected and saved the user's time zone to their account using geolocation (with minimal user interaction to keep the UX smooth). It then calculated the event start times based on the difference between the event's and the user's time zone.

I maintained a network of websites that consisted of a food blog and several membership websites built around it. The work involved regular updates, backups, bug fixes, connecting the sites with external services, and adding new functionalities to the site.

The project's real challenge was the high number of users, so I had to do all updates with the least possible downtime and outside the site's rush hours. Concerning the latter, it was helpful that we were in different time zones with the client.

I wrote a book about planning websites (in the Hungarian language, but planning to get it translated to English, too).
The book was written for website owners and taught them how to write professional briefs (so-called "Complete Website Plans") for their web developers.
I had to write this book because, during my career, I've seen a lot of stories when projects weren't ready on time or needed more costs than necessary-mostly because the communication wasn't crystal clear between the client and the developer.
With a "Complete Website Plans"-that is understandable by both parties-the development route can be smoother, and costs can be kept at a manageable level.

TPL-FW is an options framework that can speed up plugin development as it makes it easy for the developer to create settings pages and post meta boxes within plugins.
This plugin framework works similarly to ACF, but it can be built into plugins as a library in a white-label way. So with TPL-FW, you don't have to rely on other plugins to have a complex system of settings for your WordPress plugin.

The client needed a system that managed license keys sold by their WooCommerce shop. They couldn't find an out-of-the-box solution, so they outsourced it-I coded it as a WooCommerce add-on plugin.
My plugin provided an API for external websites, too-that could query if the license key in question exists or not and if it is already activated or not.

The client approached me because he was stuck setting up the correct calculation for shipping costs in his WooCommerce-based building material webshop.
He was already using a plugin for advanced shipping calculation, but it was not enough. His shipping costs were based on more factors that the plugin could handle: ZIP code, weight, size, number of pallets needed, and others.
My task was to write an add-on for this plugin that extended its functionality to fulfill the store's all shipping calculation needs.

The goal was to create a community website that allowed nutritional therapy practitioners and their patients to communicate, keep consultations, and collect patient data via intake forms.
The challenging part of the project was that the site had to be HIPAA compliant.

My task with this real estate website was to connect it with a real estate database API and load data of different listings into its pages dynamically. Users were able to set various search criteria, and the API call happened based on this user-entered data.

Before the optimization, the site was loading slowly (home page: 3-4s, listings page: 10+s). I did the regular optimizations for the whole website (caching, minifications, image optimization) that reduced loading times significantly. For the listings page, I had to write a custom caching function, as it was especially database-intensive. In the end, the site was loading in around 1s on desktops.

A multi-user portal designed to educate patients on pain management. The work involved handling the technical aspects of both in-person and online courses, as well as generating custom reports and graphs based on patient-submitted data over time. The project also included integrating multiple APIs, implementing complex workflows, and managing a large number of scheduled events. After completing the initial build, we’ve continued our collaboration through a long-term maintenance partnership.

ShadowSource is a custom web application featuring multi-role memberships, clinician–student matching, internal messaging, session booking and management, location and availability filtering, automated workflows, and third-party API integrations (including OpenAI and Google Maps). It demonstrates the development of a secure, scalable platform with complex user permissions and interconnected systems.