It's perfectly legal to enter the U.S. for business reasons, including meetings, conferences or even to raise funding. You're not allowed to become employed by

It's perfectly legal to enter the U.S. for business reasons, including meetings, conferences or even to raise funding. You're not allowed to become employed by a U.S. corporation, but you can certainly consult for them and do on-site work. I'm a Brit, and I've done all of the above several times under the VWP without border control even batting an eyelid.