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Twitter CTO Adam Messinger is leaving the company.

Messinger, who’s been at the company for five years, tweeted the news Tuesday afternoon. He was most recently running product, engineering and design — a big chunk of the company.

As part of the change, Ed Ho, who has been running product, will now take over all product and engineering and report directly to CEO Jack Dorsey, according to people familiar with the restructuring. Twitter’s new VP of Product, Keith Coleman, will report up to Ho.

Here’s a statement from Twitter on the move:

Throughout 2016, we've made progress refining our core service, launching live streaming video, giving people more control over their Twitter experience, and promoting and recruiting great talent. We’ve continued to increase the speed of implementing product improvements, and, as we've previously shared, we've seen the direct positive impact on audience engagement and growth, caused by the enhancements we're making. To further accelerate this positive momentum, we’re taking steps to streamline and flatten the organization by elevating our engineering, product and design functions, with each area now reporting directly to Jack. We believe these updates to our organizational structure will enable increased discipline in our product strategy and faster execution.

Messinger is the latest Twitter exec to depart, although many have come before him this year. Most recently, COO and head of all sales Adam Bain left the company, and before that Twitter lost a half dozen VPs across various departments. Another product exec, TellApart CEO Josh McFarland, also announced he was leaving Tuesday.

Twitter also laid off roughly 9 percent of its staff back in October and shut down Vine.

After 5 years I’ve decided to leave Twitter and take some time off. Grateful to @jack for the opportunity and to my team for shipping. — Adam Messinger (@adam_messinger) December 20, 2016

Thank you for everything you've done for Twitter Adam! I have learned so much from you, and appreciate everything you stand for. https://t.co/xdnZ9gdnnO — jack (@jack) December 20, 2016

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