Proposals, contracts and clients for web developers - Ofer Cohen
Joomla!Day Poland 2013 - Joomla Architecture (Ofer Cohen)
MongoDB World 2014 - BillRun, Billing on top of MongoDB
BillRun and Joomla - How is Joomla relate to billing system
Joomla!Day Israel 2012 - The business of Joomla
BillRun - Billing on top of MongoDB | MUG IL, Feb 2014
Joomla!Day Poland 2013 - Joomla and Open Source - How it works and how can I make it better? (Ofer Cohen)