Is there a cool slang way to say "no problem" in Japanese?
Or anything similar.. I'm looking for an idea for a startup name, and would like to reflect the idea of solving a problem or helping someone out
You can also say, mondai nai or tondemo nai.
The first one literally means no problem in a casual way.
The second one usually has a negative connotation, but when used after someone does something for you means something more like "no worries" or "not at all".
Hope that helps!
I don't know of any cool slang, but a normal expression is "kamaimasen." This gets shortened to "kaman yo" in some dialects when people are being really friendly.
Another idea is "don main" which comes from English, "don't mind".