As i have done my final year project in transportation engineering and i want to opt wre.Will there be a problem in interview in iit?
As long as I know after engineering the only way to get into IITS for masters is gate and if you successfully qualified gate with your desired subject and get marks sufficient enough to get a seat in IIT then it doesn't matter that you have done graduation from a different subject and now opting for a different one.
Hope it helps.
Thank you.