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I'm a functional programmer working at Bellroy. I love discussing about FP, distributed systems and cloud architecture... Functional Programming is often seen as a nice tool for small-scale concerns, not as a tool for application design. However, functional programming comes with interesting tools aimed at solving these boring (or deemed boring) concerns: dependency inversion, observability).A functional solution, called a monad stack, allows to combine all this cross-cutting concerns and behaviours with no magic (or not too much). Let's see how it works and how it relates to the current "Tagless Final" trend