Build modern web and mobile applications on an open cloud platform: bring your own language runtimes, frameworks, and third party libraries. Google App Engine is a fully managed platform that completely abstracts away infrastructure so you focus only on code. Go from zero to planet-scale and see why some of today’s most successful companies power their applications on App Engine. App Engine already offered a denial of service protection service that allowed developers to blacklist IP addresses and subnets, but with the launch of this new firewall into beta, Google recommends that developers use the App Engine firewall for protection.