My 2 cents
C++ seems to be popular in this area, especially for trading systems. Many Quantnet C++ (caveat: I am the originator) students are traders.
Knowing numerical maths is always good. Especially algorithmic mindset.
And Python is also great.
quantnet.com
In any case, C++ and maths is a wicked skillset to have.
www.datasim.nl
I know TCD CS from a while back ... they have a great enginneering tradition. My lectures were mostly in Number 37.