Experienced, and reasonably successful (3 exits) technical cofounder here:

Sales. Experienced, demonstrable sales excellence. Ideally selling things of comparable size to similar customers as my venture.

We should get along well, I suppose. But the best social lubricant is success, and I'm confident we'll be successful if my partner can handle customer advocacy and sales.

The greatest cofounder I've ever had was an older misogynistic homophobe (when I was a younger gay woman). We got on great because neither of us stepped on the other's toes and we crushed it.