Around 10 years back, I joined my first company, where I was introduced to a codebase which was in Java/XML, kind of an Android Application. I saw files having 12k lines. It was a nightmare situation for me to even navigate the code and to follow up on a bug we were supposed to fix! As we progressed through the years, we found lower lines per file, saw IDE limiters on number of lines in a File(Max 1000), saw Coding Architectures like MVX(MVP, MVVM, MVI, etc.) asking us to break up code blocks into smaller more testable modules, saw Testing Tooling and other advice from many asking us to test a smallest unit. Overall, the experience is a very rewarding, at each step we learnt the mistake we did previously, made amends and then made some more mistakes :laugh: and then fixed them in the coming months.