SAN FRANCISCO — Workplace chat app Slack has hired Terry Anderson as its first global communications head, amid rapid growth that has spurred the tech unicorn to a valuation of $3.8bn.

Anderson joins from Intel, where she spent two years as VP and GM of global corporate communications.

At Slack, Anderson reports to CEO Stewart Butterfield, who co-founded the messaging platform in 2013. Since then Slack has grown to 5m daily users, recently adding an enterprise version to cater to bigger companies.

Anderson's arrival comes after Slack brought in Julia Blystone as head of PR and communications in 2015. Blystone retains her role with the company.

Blystone confirmed Anderson's move to Slack. Representatives from Intel did not respond to request for comment as this story went live.

Before joining Intel in 2015, Anderson spent 14 years at Cisco, where she headed global corporate communications.