A serverless supply-ordering system running in production for a real franchise supply chain.
From a store placing an order to HQ and the store receiving the invoice, every step is validated, allocated and written atomically.
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Stock deduction on acceptance is split across several DynamoDB transactions; a failure midway resumes from the checkpoint without double-deducting, and a failed large receipt rolls back automatically.
Idempotent · resumable · auto-rollbackPlaywright E2E tests hit a real test environment and inject 5xx errors, dropped connections and latency; hundreds of backend Python tests isolate AWS with moto.
Real environment · fault injectionThe tenant is taken only from the sign-in token, and totals are recomputed on the server from the catalogue and tax rates, so the client cannot tamper with them.
Zero-trust client| Area | What was done |
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| Frontend performance |
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| Data model |
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| Production & migration |
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| Documentation |
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