Slack is one of those rare startups that seem to defy the odds at just about every turn.

Not long after the company joined the storied “unicorn club” last year, its valuation rose to $2.8 billion. This week, numerous new milestones attest to its continuing growth.

Now well-known among enterprises for its namesake team-communication software—said by some to replace email—Slack on Wednesday announced several new testaments to its growth and an important new hire. Specifically, it has surpassed 1.1 million daily active users and $25 million in annual recurring revenue; moreover, it has hired Google, Twitter, Intel and Travelocity veteran April Underwood as its new head of platform.

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