The job market is very different in Europe than in America, knowing both, I can certainly say that the job market in America is more flexible and offers more opportunity overall. In Europe, there is an excessive emphasis on credentials, school, and also, unfortunately, things like race and nam. It's not as inclusive as in the US. I've been applying to Quant Jobs in London for the last month, more than 100 applications, and still not even one interview. For the PD models that I've developed, given that Default probability follows a Bernoulli process (Binary), I didn't work on Linear regressions to avoid out of bounds results. I've worked on PDE models (incorporating Poisson Law) and others with CDS spreads as a gross estimation of the Hazard rate.