I actually did this a lot on classic Mac OS. Intentionally.

The reason was that you could put a carriage return as the first character of a file, and it would sort above everything else by name while otherwise being invisible. You just had to copy the carriage return from a text editor and then paste it into the rename field in the Finder.

Since OS X / macOS can still read classic Mac HFS+ volumes, you can indeed still have carriage returns in file names on modern Macs. I don't think you can create them on modern macOS, though. At least not in the Finder or with common Terminal commands.

I created a file with backspace in name, it was hard to understand why filename doesn't match

I don't conduct interviews very often, but when I do, one of my questions is always about interacting with files that have special characters in the filename.

Did you not just use tab? That's the usual method of dealing with weird characters in filenames that I've found