After the surprising resignation of Google CFO Patrick Pichette earlier this month, Google has searched for the best available replacement, and in under one month managed to snag what many people call the "most powerful woman" on Wall Street.

Ruth Porat, ex-Morgan Stanley CFO, is leaving the company after three decades on Wall Street. In that time Porat has been at the helm of Amazon's and eBay's IPO; steadied Morgan Stanley through the 2008 financial crisis and was an advisor to the U.S. government on the bailouts of AIG, Fannie Mae and Freddie Mac.

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"I've had the opportunity to experience first-hand how tech companies can help people in their daily lives. I can't wait to roll up my sleeves and get started," Porat said in a statement.

Porat will report directly to Google CEO Larry Page. In the management restructure last year, Page made sure only a shortlist of people reported to him directly, making Sundar Pichai head of all Google services.

Google's advertising business is starting to slow down and several moonshots have dropped off the grid in 2014. Porat will need to take charge of making sure Google has new avenues to explore, while holding back from radical investment in future projects.

Investors showed a lack of real interest in Google stock over 2014, managing a small 2.4 percent increase over the year. This is quite poor compared to Facebook at 41.9 percent, Yahoo at 23.6 percent and even Microsoft at 4.2 percent growth per year.

Google does have some incredibly interesting projects coming in the next few years, including Project Loon providing internet to the world; self-driving cars and new medical kits capable of painting cancer cells and removing them from the bloodstream.

TagsRuth Porat, Google CFO, finance, Morgan Stanley, Patrick Pichette