UBS Quantitative Analyst interview questions

I'll be short, and try to only state facts. I was given an offer within a week of the first interview because they I knew I had another pending offer, and UBS successfully convinced me that their position is amazing. I turned the other one down, arrange my PhD defense date, purchased the literature and software they suggested me to practice with before the start. Kept getting positive emails from them. And then got a call that they no longer need me, right after my defense.

A paper-based test comes first, covers programming, probability and stochastic calculus. Then get interviewed by two professionals, each 40 minutes. Questions are all technical or brainteasers, no behavourial ones.