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Twitter has made adjustments to its top executives, making Ali Rowghani the new chief operating officer and replacing him in the chief financial officer position with Mike Gupta, who held the same role at Zynga. The personnel change was first reported by AllThingsD and confirmed in a tweet from CEO Dick Costolo on Wednesday night:

Congratulations to @rowghani on his new role as COO and to @mgupta on his new role as CFO. — dick costolo (@dickc) December 20, 2012

Rowghani was previously the chief financial officer at Twitter, and he will now assume the role that Dick Costolo held before becoming CEO in 2010. Before joining Twitter, Rowghani was CFO at Pixar. Gupta was most recently chief financial officer at Zynga before coming to Twitter in November.

The company has seen several changes and hires in key roles in the last year as the company grew and moved to new offices. The New York Times recently reported that Twitter is expected to make $1 billion in revenue next year, and the executive changes come as Twitter moves to monetize and solidify its position in the Valley.