Read on to find out more about the monolithic codebase!
A monolithic codebase is a very well-recognized problem many production systems that are existing for a long time are facing today. Re-architecting it with a completely new system comprising of domain-isolated microservices implemented from scratch is very rarely possible. Primarily because it's impractical to the business folks to shut down the existing system which ultimately has to fund this exercise and also because of the risks of failure associated with such a big-bang cutover.