If he was hired by Facebook, he wouldn't have (co)developed WhatsApp. If Facebook hired him, he would most likely be worth (to Facebook) as much as any other random Facebook programmer.
Unless he's the one who started WhatsApp, it would have been developed and successful anyway and Facebook would have to buy it for the same amount of money.
The reality is that product/market fit is much more powerful force than programming capabilities of any single engineer.
Unless he's the one who started WhatsApp, it would have been developed and successful anyway and Facebook would have to buy it for the same amount of money.
The reality is that product/market fit is much more powerful force than programming capabilities of any single engineer.