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Microservices also bring a set of additional benefits, such as easier scaling, the possibility to use multiple programming languages and technologies, and others.

Java is a frequent choice for building a microservices architecture as it is a mature language tested over decades and has a multitude of microservices-favorable frameworks, such as legendary Spring, Jersey, Play, and others.

A monolithic architecture keeps it all simple. An app has just one server and one database.

All the connections between units are inside-code calls.

split our application into microservices and got a set of units completely independent for deployment and maintenance.

Each of microservices responsible for a certain business function communicates either via sync HTTP/REST or async AMQP protocols.

ensure seamless communication between newly created distributed components.

The gateway became an entry point for all clients’ requests.

We also set the Zuul 2 framework for our gateway service so that the application could leverage the benefits of non-blocking HTTP calls.

we've implemented the Eureka server as our server discovery that keeps a list of utilized user profile and order servers to help them discover each other.

We also have a message broker (RabbitMQ) as an intermediary between the notification server and the rest of the servers to allow async messaging in-between.

microservices can definitely help when it comes to creating complex applications that deal with huge loads and need continuous improvement and scaling.