Beginner · 25 min · 4 steps
Stopping late messages from moving an order backwards
Kavya Menon, Platform Reliability Engineer at FlashMart
Kavya Menon is an engineer at FlashMart, a quick-delivery app that brings groceries in under 10 minutes in Gurgaon and South Delhi. It is 1:15 PM on a hot Thursday. The head of logistics has posted a serious problem in the #war-room channel.
The question
How do we stop old, late messages from changing an order back to an earlier step, using a simple set of allowed moves?
- Finite State Machine
- Event-driven architecture
- Data validation
- Python dictionaries
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