Twilio, a developer-focused company, built its business model around individual developers and expanded into massive enterprise sales. By creating a useful and easy-to-use product, they marketed it to developers who started using and deploying it, giving the product sales momentum when they eventually went to close enterprise-level deals. Twilio's focus on developers has always driven its growth, enabling them to modernize communications by virtualizing telecommunications infrastructure and making all that power available via a flexible web API. The company's success can be attributed to its utility-first philosophy, which prioritized features such as security, authentication, and compliance, making the product "Enterprise Ready" and allowing it to move upmarket.