Question

A developer is building a serverless document-classification pipeline. An API Gateway REST endpoint synchronously invokes a Step Functions workflow that calls a Lambda to extract text, then invokes a Bedrock model via a second Lambda, and finally writes results to DynamoDB. The entire flow reliably completes in under 8 seconds, the team expects up to 3,000 requests per second at peak, and they want the lowest cost while returning the classification result directly in the API response. Which Step Functions configuration best fits these requirements?

Accepted Answer

Use a Synchronous Express workflow invoked via the StartSyncExecution integration so the result is returned in the API response.

Answer

Use a Standard workflow invoked asynchronously, then poll DescribeExecution from API Gateway until completion.

Answer

Use a Standard workflow with the StartExecution synchronous integration and a callback task token to return the result.

Answer

Use an Express workflow invoked asynchronously with StartExecution and retrieve results later from CloudWatch Logs.