The app in Slack connects over a secure connection to our dedicated backend services in Amazon Web Services. The backend is a collection of functions at AWS Lambda and a simple Amazon DynamoDB database encrypted at rest.
Additionally, there’s the static website you’re currently looking at, being served over a secure, TLS-encrypted connection.
We could tell you some much more about the cool technologies behind the app, and the tools that we’re using to build and deploy and monitor it. At some point, we’ll submit our tech stack to StackShare.