Well, I don't think the founders of that exchange complain about KDB that much.
After all KDB allowed them to go to market quickly and make billions and than they changed the tech stack when demand justified it. So what? KDB was never meant to run a large exchange, but you just demonstrated that it can run a smaller one.
> ... and without any Java optimizations really ...
Come on, be honest! All of the core tech needs to be implemented in highly optimized GC-free Java. And you need to hire senior Java consultants who are highly specialized and do that for 10+ years and they also cost millions.
I happen to know that BitMEX (located in Asia) has such consultants working from the EU. So, it's that easy to hire them!
> ... and without any Java optimizations really ...
Come on, be honest! All of the core tech needs to be implemented in highly optimized GC-free Java. And you need to hire senior Java consultants who are highly specialized and do that for 10+ years and they also cost millions. I happen to know that BitMEX (located in Asia) has such consultants working from the EU. So, it's that easy to hire them!