In my one job working for a bank, I was hired directly by the head of market risk management. He hired me because he wanted a programmer who would just do what he asked instead of having to negotiate the internal IT bureaucracy.

I threw together a system with Apache and Perl (it was the late 90s) for traders to monitor their positions and that we used to run risk analysis on a daily basis. The traders preferred my hacked together system to the official one from the IT department, because it was easier to use.

We wrote a lot of VB apps, because that was what my boss was comfortable with. Not the greatest development environment, but at least I could just write code that my boss and the traders actually needed to do their jobs, without worrying about internal politics and bureaucracy. I would say that's a lot more important than choice of technology stack.