AI Processing Workflow

1. Goal

Establish an asynchronous AI processing workflow using AWS Step Functions to orchestrate four Lambda functions in sequence:

1. Input verification checks (Validate)
2. Text extraction calling OCR engines (Amazon Textract)
3. Prompt-engineered JSON normalization (AI Proxy)
4. Confidence scoring and status routing (Confidence & Status)

The four functions above are the core AI-processing Lambdas. The workflow also invokes the official Notification Trigger Lambda for REVIEW_REQUIRED and failure alerts; its setup belongs to Observability and Alerting.

2. Lab Exercises

Select a sub-page below to complete the step-by-step instructions for each component:

• 5.5.1 Validate Lambda: Deploy and configure the input validation checks Lambda.
• 5.5.2 Textract Lambda: Configure the Lambda function that invokes Amazon Textract OCR AnalyzeExpense APIs.
• 5.5.3 AI Proxy Lambda: Configure the Lambda function that routes intermediate OCR outputs to an external LLM.
• 5.5.4 Confidence Status Lambda: Deploy the Lambda function that rates field confidence scores and routes document statuses.
• 5.5.5 Step Functions Workflow: Deploy the AWS Step Functions State Machine that connects all execution steps with catch-fail transitions.