@dabeaz * the world of functional programming, immutability, applying it to streams, and then reactive, turning pages of source code in (at least for me) eye-openingly simple & concise pivoting / wrangling of data,
* event-driven architectures, CQRS and how processing event streams is "just" folding, partitioning of events, and how this affects the extensibility and horizontal scalability of systems
* and lots more