IBM Software Developer interview questions

1 telephonic interview 2 face to face interview 3 Interview with Manager Question are mostly from C, c pointers, device driver. The Job was for AIX device driver so they aked lots of question from device driver, interrupts, DMA

It gave me a technical phone interview first. They just asked one basic algorithm question. After that, they gave me an on-site. It took 4.5 hours and interviewed with 4 engineer and one manager. Every engineer asked me 2~4 algorithm questions. I had answered all the questions very well. However, they felt my explanation was not good since my English was not good. They still rejected me at end.