Can you tell about your experience working with monolithic architecture in projects?

In projects with monolithic architecture, I worked with applications where all components — interface, business logic, and data access — are combined into a single codebase and deployed as a whole. This approach simplifies initial development and debugging, but over time can lead to challenges with scaling and maintenance.

For example, in one project, I implemented a web application in Python using Flask, where all modules were tightly coupled. This allowed for quick changes, but as functionality grew, issues with dependency management and testing individual parts arose. To facilitate maintenance, we started to isolate separate modules and use design patterns to reduce coupling.