Why it matters

Different clients have different needs. BFF matches backend to client. Understanding shapes multi-client architectures.

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The architecture

Web BFF: shapes data for web UI.

Mobile BFF: shapes for mobile bandwidth + battery.

BFF patternWeb BFFweb-shaped APIMobile BFFmobile-optimizedBackend servicessame underlyingReduces round trips: BFF aggregates data client would otherwise fetch separately
BFF pattern.
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How it works end to end

Response shaping: aggregate + filter for each client.

Aggregation: combine multiple backend calls into one client-facing response.

Ownership: same team owns client + BFF for tight iteration.