IBM started with an online aptitude test. The questions were very confusing, and I didn't see the point of them.

After that, the interview process was very smooth. Though they didn't give a choice for location. They just randomly assigned people based on their written test results to various locations.

They did give many offer letters, but the package was not up to what other companies offered for the same position. Even the perks weren't as good as other IT companies of the same league.

I don't remember the exact question, but they grilled us down in C programming. You must have deep C knowledge to clear the C interview process.