AWS Lambda

AWS Lambda runs back end code in response to AWS specific events such as object uploads to S3 buckets, updates to your DynamoDB tables, data in Kinesis streams or in-app activity. 

Serverless functions handle all the underlying infrastructure tasks such as capacity provisioning & auto-scaling, patching, administration and code monitoring. They simply run code in response to events. You no longer need to worry about performance or security considerations. Use functions to process data (data transformation/data enrichment) at scale in realtime or build responsive apps with event-driven communication between decoupled microservices. 

Invoke Lambda functions via Webhooks on Ably.