How we switch the whole system and keep the system stable

Try to imagine, that you have multi-million company, which product code is as bad as it can be, and you are fighting with challenge to create new system based on Symfony without down time, with continues integration and you want to be able to run both systems same time. Now stop imagine and come to my talk! :-) I will tell you how we started, what changes was necessary to be done, and how we fucked up many times in this process.

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