I have engineer in my title, I work in software, and there kind of is a PE available for software but it’s actually just an EE license with maybe half a dozen software questions tacked on. I’ve never heard of anyone in software actually getting it. It’s slightly more common in EE and ME, and I think a lot more common in civil and structural engineering.

I don’t know how aggressively state engineering boards actually enforce their hold on the word “engineer”, but I still try to be careful. The last thing I want is to get sued for misrepresenting qualifications.