Cost-Efficient Serverless Workflows with Express Step Functions

Lambda and API Gateway are the bread and butter of the AWS serverless ecosystem. Lambda offers a compelling programming model of inputs and outputs. Lambda's name is taken from the concept of simple anonymous functions and implies simplicity and ease of use. Lambda delivers on this promise beautifully when our requirements are simple: "enqueue this message" or "fetch the item with this key from the database". In the real world, our requirements aren't always so simple. Sometimes we must do multi