Okay, I'm not ISFP, but my twopence. Or threepence.
My office in London was full of INTJs. They often went round in dark suits, and would whisper something controversial in your ear when your computer wasn't working, such as: "Switch it off, then switch it back on again." They would then head back down to IT.
When our IT was outsourced, they then ended up on the development team, or helpdesk. There was one who used to give me a look of horror when I approached him, as I was probably going to say "um...just...one...more...thing." His boss used to thank me for keeping him on his toes.
I love you guys. You can come up with solutions that INTPs can play with for hours, trying to break it. Sometimes we do, and you give us such looks of exasperation and/or bewilderment that can crack my glasses.
All power to you.
Oh. Attractive? Oh yes, definitely. I've held a torch for one or two in my time.