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A comment on Slack Closes $250M Funding Round at $5B Valuation. Parent comment

Re:Slack Closes $250M Funding Round at $5B Valuation by hkarthik on Monday September 18, 2017 @12:21PM (#15277201)
Yes, the internal tool is called uChat and it's based on Mattermost but Uber heavily contributed to Mattermost to make it scale. More details here: https://eng.uber.com/uchat/
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