The handle on your GitHub profile, your work email, and your LinkedIn URL is the one that ends up in interviews, salary discussions, and reference checks. The "PixelWraith42" you picked at 14 is not the one you want sitting at the top of a recruiter's tab.
A few rules for the professional band:
Use your real name if you can get a clean version. "first.last" or "firstlast" is the strongest professional handle, period. It tells the reader you're confident in your work.
If your name is taken, use a real-name plus a real word. "alex.codes", "marina.builds", "linokim.dev". The word should describe what you do, not what you like. "kim.dev" beats "kim.cats".
Avoid years. "alexk1995" prints your birth year on every profile. Recruiters notice.
Avoid jokes. "hireme.now", "willbreakprod" — funny in a group chat, weird on a resume.
Match across platforms. Your GitHub, your email, your blog, your LinkedIn URL: the same handle. Cross-platform consistency is professional shorthand for "this person is real."
Email rule: the email you put on a resume should be a 6-to-30 character handle on Gmail (or your own domain) that's lowercase, easy to spell, and doesn't include numbers if you can help it. "yourname@gmail.com" beats "yourname.99@gmail.com" beats "yourname1995@gmail.com".
If you're starting from zero, generate with PickName's "Professional" style, which avoids leetspeak, gamer slang, and underscores. Pick the three handles you'd be willing to put on a resume, then check availability on GitHub and Gmail before you commit.
Related: Username character limits across every platform (2026).