Siemens Senior Software Developer interview questions

The interview process was normal ... little delayed.... got call from HR for telephonic interview...gave telephonic interview...cleared it , next scheduled was video conferencing interview.... which it took after 1 month , i repeatedly kept sending mails to HR , but he did not come back...finally i called him then for sat he scheduled the video conferencing round which was taken from thier office and the panel will be from Gurgaon office.... The guy on panel was asking so rudely....he kept asking like this - "" Answer me....are you there...why are you not answering.." like i am going to answering for my crimes to the Judge in the court....it was harsh interview...asked lot of OOPS , composition vs aggregation , SOLID principle , not much java , asked upon non functional requirement in project , SDLC...not much technical but theoretical technical on OOPS concept thoroughly....

1. Written test - Multiple choice 2. Technical round - 2 ppl panel- texchnical questions 3. Managerial Round - one manager , Why Siemens? No onsite 4. HR- Salary and when can we join. (generic)