In several projects I've seen application.properties or application.yml files in test resources. These files were almost exactly the same as files in main resources. Each time developer adds a new configuration to file in main resources, he/she needs to update a file in test resources. It's definitely a code smell. …

Often, as a product to the customer, not only binary files are transferred, but also source codes of applications. It is then worth considering whether you want to transfer the entire GIT repository or only the source codes. If we were the recipient of a product, the history of file changes can be very valuable …

There is awsome, free and intensively developed tool for drawing diagrams and schematics - diagrams.net (former draw.io). The easiest way to use this tool is to work in a web application accessible through a browser.. There is a desktop option, which could be installed on Windows, Linux and MacOs. Example diagram: …