On Thursday, the Palo Alto, Calif.-based startup announced it was joining Twitter’s workforce. Yes will shut down its mobile apps, Frenzy and WYD, the company said in a blog post.

Coleman will fill a job that’s been vacant since January when Kevin Weil jumped ship to Instagram, where he now heads the product team. Coleman will report to Twitter CTO Adam Messinger, while the rest of Yes’s small team will join various product and engineering teams, according to a Twitter spokesperson.

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Prior to founding Yes in 2014, Coleman spent a decade at Google, where he worked on products including Gmail, Inbox, and Gchat.

Over the past 18 months, Twitter has been continually shuffling its executive ranks. After former CEO Dick Costolo stepped down in June 2015, it took a few months for the company to finally appoint co-founder Jack Dorsey as its permanent chief executive. In January 2016, Twitter announced the departures of four executives, including Weil.

Twitter Lays Off 9% of Its Workforce

Last month, COO Adam Bain, who joined the Twitter from Fox Interactive Media in 2010 as president of global revenue and partnerships, announced his departure. Anthony Noto, who headed finances, has since taken on the job and Twitter is expected to hire a new CFO.

Meanwhile, Twitter struggled to fill the VP of product position. Coleman will be the company’s fifth product chief since 2014.