Twilio's SDK Engineering group at Twilio is responsible for building and maintaining two real-time communications products, including web and mobile SDKs for making and receiving VoIP calls and Programmable Video for adding video chat capabilities to developers' apps. The testing requirements for these products differ from those of typical REST services due to the unique demands of real-time media development. To address this, Twilio has developed a comprehensive testing approach that includes unit tests, end-to-end tests, mobile-specific tests, and automated tests for resource consumption, device testing, browser compatibility, and media quality. The company's quality engineering efforts have been successful thanks to collaboration with TestDevLab, which allows for 24/7 development process management using the follow-the-sun model.