TYPO3 Expert & Instructor


I'm Kevin Chileong Lee and I'm looking forward to your visit.

I've been working as a TYPO3 full stack developer for over 10 years and since then I've made TYPO3 templates from dozens of page templates and written TYPO3 extensions.

I have been a TYPO3 lecturer on Udemy for over 4 years and have been able to accompany more than 1000 participants on their way to the TYPO3 CMS.
In addition, I was allowed to hold several private coaching sessions for TYPO3 in German and English.

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My Skills

In the following I will show you my most important skills as a TYPO3 full stack developer with over 10 years of professional experience in this area.

TYPO3 Frontend Development

I create page templates, frontend plugins and custom content elements for TYPO3 from version 6.2.

I specialize in Bootstrap.

TYPO3 Backend Development

I develop backend modules, extend or change TYPO3 form fields and configure via TypoScript.


I specialize in jQuery and jQuery plugin development.

I can also take JavaScript vanilla and small projects in Vue.js.


Needless to say, I only write in HTML5 and CSS3.

I only do frontend development for Chrome, Firefox, Edge, Brave.

Git, Github and Subversion

I regularly use Subversion, Git and GitHub for my version control.

Image Editing

Thanks to my hobby of landscape and architecture photography, I can handle Adobe Photoshop and have the latest version of Adobe Photoshop.

I also work in print-on-demand and can therefore also use Affinity Designer (similar to Adobe Illustrator).


Although I have learned and master various programming languages, I only offer my services in PHP.

I write clean object-oriented code from PHP 5.6 to PHP 8.1+. I document my code in German or English. In addition, I adhere to the TYPO3 Coding Standards and actively work with the TYPO3 API.


TYPO3 Full-Stack-Developer
01/2012 - Present

TYPO3 Full-Stack-Developer & Instructor
03/2018 - Present

I've been working as a TYPO3 Full-Stack-Developer at a small advertising agency in Frankfurt am Main since early 2012.

I have had a side business since 2018 and have worked in many areas. For several years, however, my focus has been on TYPO3 with my T3 Campus and the creation of TYPO3 templates with T3 Templates.

Freelance PHP Developer
07/2009 - 12/20211

After looking for a job for several months, I found an offer to work as a freelancer for a small advertising agency in Frankfurt.

I took advantage of this opportunity and took my first steps towards self-employment.

I was able to successfully take care of many PHP projects and several customers.

Java & PHP Developer
03/2008 - 04/2009

I wrote my bachelor thesis in an advertising agency in Frankfurt am Main. During this engagement, I received an offer to start at the same company immediately after completing my bachelor's degree.

Here I was allowed to write Java Server Pages and my first PHP applications.

Bachelor of Science in Computer Science Thesis
10/2007 - 03/2008

I wrote my bachelor thesis during my internship in an advertising agency in Frankfurt am Main.

The title of the bachelor thesis is:

Development of a facility management system as a web application in Java

The topic was a concrete LIVE project at the advertising agency mentioned.

Bachelor of Science in Computer Science
10/2004 - 07/2008

I always wanted to be a computer scientist, I knew that when I was 6 years old. A few years later and after many obstacles, the time had finally come in 2007.

The period of study at the Darmstadt University of Applied Sciences was a very special time for me, and I am very happy to have successfully completed my course.

Specialist for media and information services in the library department
09/2022 - 07/2003

The name of the training is just as boring as the training itself - at least for me.

Nevertheless, I am very grateful to be able to do this training and to have successfully completed it. Because it was in one of the most difficult phases of my life ever.

I would especially like to thank Mr. Vito Bilello, Ms. Kristina Johne and Ms. Sonja Barthelmes.

Are you ready to work with me?

info@slavlee.de or via my contact form.