15 of the fastest growing startups in the world still flying...

15 of the fastest growing startups in the world still flying under the radar
Julie Bort, businessinsider.com

By now, startups like Slack, MongoDB, Cloudera, Pure Storage are well known for their fast-growing businesses.

But we wondered: Who are the fastest-growing startups in the world that serve businesses, that we should be hearing about next (i.e.…