SUNNYVALE, Calif. — The incredible shrinking Yahoo, once one of the powerhouses of the Internet Age, is about to get even smaller.

Yahoo Chief Executive Marissa Mayer said Tuesday that the company will cut 15 percent of its workforce, close five international offices and explore “strategic alternatives” as part of an effort to cut expenses and streamline its operations.

Yahoo’s said the efforts would result it reducing its workforce to 9,000 employees and less than 1,000 contractors by the end of the year. Most of the job cuts are expected to be completed by the end of March. Additionally, Yahoo said it would close its offices in Dubai, Madrid and Milan, Italy, in addition to quitting operation in Mexico City and Buenos Aires, which became public last week.

Yahoo said its plans are aimed at cutting its operating expenses by more than $400 million by the end of 2016.

“Today, we’re announcing a strategic plan that we strongly believe will enable us to accelerate Yahoo’s transformation,” Mayer said, in a statement. “This is a strong plan that calls for bold shifts in products and resources.”