I stared at my screen for 6 hours. The API kept returning 404. I checked the Lambda code line by line. I tested the DynamoDB table. I redeployed the API three times. Everything looked right.Then I noticed it. The resource was named /Students — capital S. My frontend was calling /students — lowercase. That was it. Six hours. One capital letter.

This is the story of building my first serverless app on AWS — a Student Record Management System — as part of my AWS Cloud Practitioner journey. I'll walk through the full architecture, how I built it, and every AWS configuration bug I hit along the way.…