Spring Framework: Classic. Reliable.
Docker, Swarm and Kubernetes. Containerization is the new virtualization. I got hooked by virtualization tools since I started with IT.Apache Kafka: because streams > queues.Nginx + Certbot (to proxy everything to my docker cluster and making the stack hibrid, cloud agnostic and having encrypted communication).Apache Avro. In case JSON is expensive you can serialize to raw bytes and massively increase the bandwith between your systems and still count with a strict schema as a contract.- There are others like the Proto Buffer. The concept is the same, but without a schema.