This was the method used by my former employer. Are entire backend was Kotlin/Java/Scala... and a couple of NodeJS apps. Right up until the very edge where C++

This was the method used by my former employer. Are entire backend was Kotlin/Java/Scala... and a couple of NodeJS apps. Right up until the very edge where C++ handled the interface with the exchanges. We also did the typical thing of having our servers as physically close as possible (in New Jersey).