EPAM Systems Senior Software Engineer interview questions

1) Quick interview with recruiter by Skype - some really basic and general things discussed, initial information about the position and who am I, what I've done in the past and what I expect to do on this position 2) Relatively easy technical interview about theoretical programming basics like OOP, design patterns, my primary technology stack and something about previous project I've done. 3) Practical tech interview: 3 tasks - implement "disposable object" pattern, implement thread-safe singleton pattern and one more or less "real task" - you have some input collection of strings and need to apply some logic to produce output collection of integers :)