Microservice backends. And native app api servers. Highly recommend over rest apis for anything with significant traffic. The clients handle multiplexing over

Microservice backends. And native app api servers. Highly recommend over rest apis for anything with significant traffic. The clients handle multiplexing over multiple threads. And avoiding a single tcp connection per api call. And the servers give you a great api / microservice framework that's not too frameworky. It "just works" without magic.