Simplify your code with annotations - SymfonyCon Warsaw 2013
#SPUG - Legacy applications
PHPConPl 2013 - Allowed memory size of X bytes exhausted
SpreadIT - Make your project SOLID!
Game of performance - Message Brokers behind the scenes
Arduino - SymfonyCon 2014 Lighting Talks
Varnish - Tips & Tricks - 4Developers 2015