1. Understanding Domain Driven Design – is an approach to software development for complex needs by connecting the implementation to an evolving model.
2. Reactive Programming – is a programming paradigm oriented around data flows and the propagation of change.
3. Concurrency in Java – is a form of computing in which several computations are executing during overlapping time periods –concurrently – instead of sequentially (one completing before the next starts). This is a property of a system – this may be an individual program, a computer, or a network – and there is a separate execution point or “thread of control” for each computation (“process”).
4. Hexagonal Architecture – Allow an application to equally be driven by users, programs, automated test or batch scripts, and to be developed and tested in isolation from its eventual run-time devices and databases.
As events arrive from the outside world at a port, a technology-specific adapter converts it into a usable procedure call or message and passes it to the application. The application is blissfully ignorant of the nature of the input device. When the application has something to send out, it sends it out through a port to an adapter, which creates the appropriate signals needed by the receiving technology (human or automated). The application has a semantically sound interaction with the adapters on all sides of it, without actually knowing the nature of the things on the other side of the adapters.
5. Programming in the Large