Also the trade engine should be written in java or python.
Why?
I would like the trade engine to be written in Haskell, Erlang or some flavor of Lisp. Just because a functional language makes it easier to keep the code clean of unintended consequences. Also, Java is very bloaty, not a good thing for high performance code.
However, I understand sometimes compromise is necessary.
You can run java very lean if you know what your doing and not adding a hundred libraries to it. But this is one of those flame wars that will start cause you like those languages better, in any case what ever language would be better.
Also the trade engine should be written in java or python.
Why?
I would like the trade engine to be written in Haskell, Erlang or some flavor of Lisp. Just because a functional language makes it easier to keep the code clean of unintended consequences. Also, Java is very bloaty, not a good thing for high performance code.
However, I understand sometimes compromise is necessary.
A high performance trade engine should be written in C/C++, simple as that.
Again this is what language you like better, and will probably start a flame war. Also C/C++ if they don't know what they are doing can have massive memory leaks with all that data.