Twilio Inc.
A maker of cloud communications software, Twilio hands developers the building blocks—programming APIs—to add messaging, voice, and email to their own apps, plus identity and authentication tools and a customer data platform called Segment. Its services power two-factor login codes, text alerts, and personalized outreach for hundreds of thousands of businesses, from tiny startups to big enterprises. Twilio's platform rests on a "Super Network" software layer that ties together global communications networks so messages get delivered smoothly.