Simplifying Application Architecture with Modular Design and MIM

I’ve written a deep dive into Software Design focusing on the "gray area" between High-Level Design (system architecture) and Low-Level Design (classes/functions). What's inside: * A step-by-step tutorial refactoring a legacy big-ball-of-mud into self-contained modules. * A bit of a challenge to Clean/Hexagonal Architectures with a pattern I've seen in the wild (which I named MIM in the text). * A solid appendix on the fundamentals of Modular Design. (Warning: It’s a long read. I’ve seen shorter ebooks on Leanpub).