Customer.io

Customer.io helps businesses send the right message at the right time. Their customer engagement platform powers personalized communications across email, SMS, push notifications, and in-app messaging for companies like Notion, Segment, and Calendly. With over $100 million in annual recurring revenue reached in October 2025, they've built a profitable, growing business on the premise that behavioral data—what users actually do—beats demographic guesses every time.

Founded in 2012 in Portland, Oregon, Customer.io has been fully distributed since early in its history. Today, the team of approximately 450 people spans six continents, with roles hired regionally across the Americas, EMEA, and APAC. There are no offices to return to—the company operates entirely remotely, with coworking stipends and periodic team gatherings replacing traditional headquarters.

Customer.io offers 100% employer-paid health, dental, vision, and mental health coverage for employees and their families. Other benefits include unlimited PTO, 16 weeks of paid parental leave, home office and wellness stipends, and a professional development budget. The engineering team works with React, Next.js, Ruby on Rails, and AWS infrastructure, maintaining a platform that sends tens of billions of messages annually.