[alain94040]

AngelList and LinkedIn are your primary tools. The problem with angels is that they don't go around with an angel hat, unlike VCs. But they are everywhere in Silicon Valley. Go find a list of 100+ angels in your space from AngelList, then look them up on LinkedIn and find out who you know who can connect you. Then, pitch your network upward. You seem to know people at Google. Surely a few of them know more senior ex-Googler, who in turn may be doing some angel investing on the side.

Like everything else, this will only work if, when you demo your product, people love it and want to help you. If they want nothing to do with you, then of course all your networking efforts will be in vain.