Integrating Lambda Durable Functions into a Step Functions Workflow
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AWS Lambda Durable Functions, announced at re:Invent 2025, extend execution time to one year via a checkpoint/replay mechanism, but AWS recommends combining them with Step Functions for hybrid architectures. The article details the CDK setup required, including `durable_config`, a Lambda version and alias with qualified ARN, and the `AWSLambdaBasicDurableExecutionRolePolicy` IAM policy — noting that adding `durable_config` to an existing function triggers a resource replacement. This pattern lets developers use durable functions for application-level logic within a single Lambda while Step Functions orchestrates the broader multi-service workflow.