$3.8 billion Slack just lost another high-profile executive

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Jason Shellen.
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Jason Shellen

Slack’s head of platform, Jason Shellen, has suddenly left the company, less than a year after joining the $3.8 billion startup, Recode’s Kara Swisher reported Thursday.

It’s unclear why Shellen left or where he is headed. While his LinkedIn profile still says he’s at Slack, the company confirmed with Business Insider that Shellen had indeed left.

“We can confirm that Jason has left Slack,” a Slack representative said. “He wound down his time at the company in late December to pursue a path closer to his entrepreneurial roots.”

As head of platform, Shellen was largely in charge of Slack’s platform business, the company’s effort to make its messaging app a broader workplace service that takes care of things like expense reports or meeting notes. Slack recently launched an $80 million fund to support this initiative.

Shellen’s departure is the second high-profile executive loss for Slack in recent months. In November, its chief marketing officer and chief revenue officer, Bill Macaitis, left, leaving a huge position empty for the fast-growing startup.

The departures come at a tough time for Slack. The company is battling two new big-name competitors, with both Facebook’s new Workplace service and Microsoft’s Teams products aiming to scoop up the business users who have flocked to Slack’s messaging platform.

For what it’s worth, Shellen has a history of short stints throughout his career. He lasted only 10 months in his previous position at Pinterest and also spent only 10 months at his job before that, according to his LinkedIn profile.

Despite these changes, Slack has been adding firepower to its sales side. After hiring Robert Frati earlier this year as its first sales chief, Slack also poached Dropbox’s Kevin Egan in November.