The Internet of Things (IoT) is a rapidly growing field that connects physical devices to the internet to enable communication and data exchange, but achieving reliable and secure connectivity is still a significant challenge. One of the main obstacles is the lack of robust firmware development and maintenance tools for low-power microcontrollers. To address this challenge, a new approach called a microvisor has been developed, which uses hypervisors for microcontrollers to enable reliable and secure remote operations such as failsafe over-the-air firmware updates on Internet-connected devices. A microvisor divides a microcontroller into two sections at boot time, using hardware separation to isolate security critical components in a system, allowing for complete security and agnosticism towards operating systems or programming languages. The Twilio Microvisor is a fully managed implementation of this architecture, offering features such as managed security, true remote debugging, and unbrickable over-the-air firmware updates, making it an attractive solution for IoT development.