The wrapper to fit Lambda into a client-server synchronous-invocation world is API Gateway. But Lambda was built as an event consumer e.g. listening to a SNS q

The wrapper to fit Lambda into a client-server synchronous-invocation world is API Gateway. But Lambda was built as an event consumer e.g. listening to a SNS queue. If you look at the broader set of AWS services you have a full toolbox of event-driven pub/sub message/event-driven tools to play with: Lambda / Kinesis / S3 / DynamoDB / SNS / SQS / Cognito / IoT and more. It's enough of an integration & compute lego kit to build complete distributed/asynchronous pub/sub applications. However the tools are kinda .. developmental, you'll be doing much of the wiring up yourself.