Designing the BFF Contract: Request Aggregation & Client-Specific Shaping
API design principles, response shaping, versioning strategy, and what belongs in the BFF vs upstream services.
Apr 8, 202615 min read20

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A practitioner's guide to the BFF pattern — from architectural rationale to production-grade implementation. Covers when BFF earns its complexity, how to design a clean client-specific API layer, and what it takes to run it reliably on Azure. Stack: Vue 3 · .NET Core 8+ · Azure.
API design principles, response shaping, versioning strategy, and what belongs in the BFF vs upstream services.

The problem it solves, the cost it introduces, and the honest answer on when not to use it.

Your frontend has outgrown the API it was given.
