Some part of the system are more than 10 years old, so with the time it's more and more becoming a spaghetti/lasagna code. The main code base is only 150k lines of code for 3-5 developers.
For making sure that we don't have to rewrite everything in 5 years, I'm trying to figure ou which way we should go. So I'm reading books/blogs ("Building Micro Services" by Sam Newman or "Patterns of Enterprise Application Architecture" by Martin Fowler for instance) and they are full of great patterns, but they all seems to need a developer level higher than what we have here.
Do you have any advice about what, as a technical director, I should try to improve our system quality without losing the entire team (and my CEO support) because I'm reviewing every single line of code?
For instance microservices seemed like a good thing but all the trouble with deployment, data synchronisation, and configuration seems to me like show stoppers.