Languages:

PHP
Javascript (ES6)
C++
Java
Python/Lua/Ruby

Databases/ORM:

MySQL
PROPEL ORM
DOCTRINE ORM

Frameworks (MVC)::

Symfony
Laravel
Yii
Extbase + Fluid

OS:

Linux/Unix
Windows

Javascript frameworks/libs:

jQuery
React JS
Angular

Applications:

Typo3 CMS
Magento Commerce
Censhare / Ibrams

Other frameworks/libs/...:

Bootstrap
Machine learning (Torch 7 / Lua)
SEO
CSS frameworks: Bootstrap/Semantic-ui/Grommet
XSLT/XML transformations
serverless architecture
web services/restfull architecture
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