The worst software I have ever seen in my 30+ years career is a 20 years old micro-services system. Basically the worst spaghetti code you can imagine, distributed over 150+ micro-services.

I have worked on a monolith that solved the exact same problem. And it was straightforward to maintain and upgrade.

I feel sorry for future developers who will have to take over and maintain micro-services systems created today. Teams that can’t create maintainable, well designed monoliths, will create an even bigger cluster f** using micro-services.