Demo: turning an HLD component into an LLD a team can build
On This Lesson 3 topics
This lesson is planned. The outline below lists the topics it will cover. The full lesson has not been published yet.
In this lesson
turn the order-fulfillment component into a buildable LLD; prepares ARC-034-LAB1.
Draft outline details
Step by step
- Take the HLD component "Order fulfillment" and state its responsibilities and boundaries.
- Define the internal modules and the order state model with allowed transitions.
- Write the sequence flow for the happy path from payment captured to carrier booked.
- Planned mistake: stop at the happy path. Fix: add failure cases (ERP down, carrier rejects, duplicate payment event) with retry limits, idempotency keys, and customer messages.
- Add the interface contracts used and the non-functional specifics (volume at peak, timeouts).
- Hand it to a role-played delivery lead and note every clarification asked; fix the LLD until none remain.
Practice
Apply this lesson with the module's lab, exercises and quiz.
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