How did you find a business/sales cofounder for your startup?

I'm the founder of a pre-mvp startup in the legal space, that is due to launch end of jan. I am a developer by trade, and am heading a team of 4, including 3 developers. The missing piece now is a sales head, after my previous one suddenly left due to life circumstances. Cold calling is where 95% of our success is from.

I am carrying the weight since the start of this week, but I cannot spend all day cold calling, while also heading development and meeting with beta users. Where did you guys find your business/sales cofounder?