AWS Step Functions is the correct choice because it provides a visual, step-by-step workflow with state tracking and automatic retries which match the developers' needs.

Step Functions builds visual state machines that coordinate multiple AWS services and microservices with defined steps, branching logic, built-in retry and error handling, and persisted state so teams can orchestrate complex workflows with minimal custom code.

Amazon SWF can coordinate tasks and workers for background jobs but it is not a visual state machine service and it is an older orchestration option that is less commonly chosen for new visual workflows.

Amazon SNS provides publish and subscribe messaging and fan-out delivery but it does not offer ordered steps, state tracking, or the built-in retry and error handling needed for step-by-step orchestration.

Amazon EventBridge acts as an event bus for routing events to targets and it supports scheduling and filtering but it does not natively provide a visual, step-based state machine for orchestrating sequential workflows.

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