I developed many high traffic web sites (1.000.000 page view per month), designing both the hardware/networking infrastructure and the database/application level.
I develop mainly in PHP and PostgreSQL and have a deep knowledge of linux system. I contributed to PHP codebase (PostgreSQL PDO driver) and wrote several utilities for PostgreSQL management.
For performance reason I develop also in C.
In the last year I released one application for IOS (in app store Il Vangelo del Giorno) and I'm currently developing another one.