Backend Certification · Lesson 9 of 12

API Boundaries and Internal Service Contracts

Define cleaner boundaries between backend surfaces so behavior stays easier to reason about.

API boundary Boundary leak Caller expectation Contract drift Request shape Response shape Service contract Versioned contract

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What you will learn

Explain why API boundaries and service contracts need explicit backend review before teams depend on them.
Identify request shapes, response shapes, and caller expectations that should stay stable across backend changes.
Spot contract drift and boundary leaks before they confuse dashboards, integrations, or internal workflows.
Recommend one service-contract safeguard that makes a backend boundary easier to trust and change safely.

Lesson shape

28 minute lesson with 6 sections, 4 exercises, 5 checkpoint questions, and 1 homework submission.

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Lesson outline

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