I want to explain my reasons of leaving EPAM with more details :

1) My new employer offered me slightly higher salary (+ the same amount of money while I'm in a business trip)

2) Soon I'll be in a very interesting business trip (starting from the midst of November)

3) They offered me a bigger project (a small part of a huge project) with new technologies and the ability to "grow fast" (if I'm smart and well organized).

4) And also we developed a smooth process of integrating me into their business process and this new project.

So, I'm sure that were sufficient reasons to leave.