Inter-microservice communications are managed through in-memory connection routing. A sending microservice writes a message over a port associated with the connection. The message is routed directly to one or more receiving microservices associated with the connection over their ports associated with the connection. The message may be converted to a different format or multiple different formats through plugins processed when the message is received over the sending microservice's port and before the converting messages are routed over the receiving microservices' ports. The inter-microservice communications are hardware and platform independent or agnostic, such that the microservices associated with the connection can be processed on different hardware and different platforms from one another.