To give you some more details of how Java can be used in the backend, while there's obviously unknown "generic business logic" there's also big name infrastruct

To give you some more details of how Java can be used in the backend, while there's obviously unknown "generic business logic" there's also big name infrastructure pieces you can look up: - https://en.wikipedia.org/wiki/Apache_Hadoop https://en.wikipedia.org/wiki/Apache_Hadoop - https://en.wikipedia.org/wiki/Apache_Kafka https://en.wikipedia.org/wiki/Apache_Kafka - https://en.wikipedia.org/wiki/Apache_Cassandra https://en.wikipedia.org/wiki/Apache_Cassandra - https://en.wikipedia.org/wiki/Apache_Lucene https://en.wikipedia.org/wiki/Apache_Lucene - https://en.wikipedia.org/wiki/Elasticsearch https://en.wikipedia.org/wiki/Elasticsearch - https://en.wikipedia.org/wiki/Apache_ZooKeeper https://en.wikipedia.org/wiki/Apache_ZooKeeper - https://en.wikipedia.org/wiki/Apache_ActiveMQ https://en.wikipedia.org/wiki/Apache_ActiveMQ