Librado Romero/The New York Times

“I had one of the best jobs in the world,” said Chris Sacca, who left Google. “But there is a world of opportunity.”

SAN FRANCISCO — Chris Sacca had a plum job as the Wi-Fi guru at Google. But with his stock options fully vested, he left the Internet search company this month for a new career as a venture capitalist.

Mr. Sacca, 32, joins a growing number of Google millionaires hoping to parlay their newfound wealth into even greater riches by bankrolling technology start-ups.

Andrea Zurek, a former manager for a Google ad system, left in October. She is considering an investment in a company started by another Google alumnus.

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