By Douglas MacMillan 

Brent Callinicos is stepping down as Uber Technologies Inc.'s chief financial officer after helping spearhead the car-hailing service's fastest years of growth.

Uber Chief Executive Travis Kalanick shared the news of Mr. Callinicos's departure with investors Monday in an email reviewed by The Wall Street Journal. Mr. Callinicos will stay on as an adviser to Uber, while no replacement has been named, Mr. Kalanick told investors.

"Almost two years ago, I brought on one of the great financial operators in Silicon Valley as our CFO," Mr. Kalanick wrote. "Brent has done a wonderful job here at Uber but has decided that it is time for his next journey, one where his wife and daughter take the front seat."

In an email to staff, Mr. Callinicos thanked the company but emphasized his desire to spend time with family. "It is time to do what I have desired for a very long time; time to keep a promise to my wife of not missing another school play, swim meet, or academic achievement of our daughter's childhood."

Mr. Callinicos--who joined Uber in 2013 from Google Inc., where he was treasurer and chief accountant--is one of the highest ranked executives to depart Uber. He helped the company raise more equity capital from investors--more than $5 billion--than any private, venture-backed company in history, according to Dow Jones VentureSource.

"He will be a legend among startup CFOs," said Erik Gordon, a professor at University of Michigan's Ross School of Business, in an email. "He raised a mountain of cash at sky-high valuations for a company with little in the way of proprietary assets and lots of peculiar risk."

The departure leaves Uber, one of the most highly-anticipated candidates for an eventual public offering, without a CFO. Gautam Gupta, formerly a Goldman Sachs Group Inc. vice president who joined Uber in 2013, will be acting head of finance, Mr. Kalanick said in the memo.

The company may hope to fill the vacancy with someone with CFO experience at a public company, a qualification Mr. Callinicos lacked. Before Google, he spent 15 years in various roles at Microsoft Corp., including treasurer and finance chief of its platforms and services division.

Uber was valued at $41 billion in a funding round last December. The company has raised a total of more than $5 billion in equity funding from a mix of high-powered investors such as venture firms Benchmark, First Round Capital and Google Ventures, Chinese Internet company Baidu Inc., mutual funds BlackRock Inc.and Fidelity Investments and even Qatar's sovereign-wealth fund.

Mr. Kalanick has sought to bolster his management bench with technology veterans, including Amazon.com Inc. alum Jeff Holden, who became Uber's product chief last year, and chief technology officer Thuan Pham, who joined in 2013 from VMWare Inc.

Write to Douglas MacMillan at douglas.macmillan@wsj.com

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