Leveling a Serverless application’s design using Hexagonal architecture
summary
Hexagonal design isolates business logic as a simple contract so the same core runs in AWS Lambda, on an IoT edge box and behind S3 or DynamoDB triggers; port adapters translate payloads and errors. Built an H1 device that creates maps in three minutes with precision less than 5 centimeters. Migrated an Apollo/Express GraphQL service to serverless in less than a week, cutting always‑on server cost and reducing food‑waste handling. A small middleware called lambda factory stitches event types to adapters so code stays portable and testable.
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