I am wondering what is the greatest product-based company in terms of revenue and impact that had no more than one programmer. To be strict about the definition I am looking for a company that generated cash (not raised it) while still having a relatively small programming team.

Top of my head plentyoffish and minecraft are the two main ones that probably everyone heard of? If you relax the condition of 1 programmer a bit then whatsapp is certainly up there.

Also if you consider btc a product (although I am not a fan of crypto) and don't believe the theories about satoshi being a group, then btc is definitely up there. In fact this one needed almost less than one programmer since you had to do very little 'maintenance' after the codebase stabilised.