San Francisco-based Eoghan McCabe set up Intercom with business partner Des Traynor in 2011.
It looks set to become one of Ireland's first unicorns - a private company with a valuation of more than $1bn. So far, the company has raised more than €60m and internal valuations peg its worth at close to €480m. Dubliners McCabe and Traynor hold a narrow majority stake. It's McCabe's third big company, having sold the previous two.