Requirements:
*Java SE 7, RxJava, concurrency, NIO, network, collections.
*Java EE, Spring, JSP, JSF, JDBC, JPA, JMS, REST.
*SQL, NoSQL, streaming, data processing.
*computer science(algorithms, data structures), functional and OOD design, reactive and distributed aproach, microservices.
*Scala, Akka, Play, monitoring, concurrency.