Brownfield Migration: The Strangler Fig Approach to BFF Adoption
Incrementally introducing a BFF in front of an existing monolith or REST API without a big-bang rewrite.

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Series
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.
Incrementally introducing a BFF in front of an existing monolith or REST API without a big-bang rewrite.

Making the BFF fault-tolerant using Polly. Handling partial upstream failures gracefully in aggregated responses.

Where caching belongs in a BFF architecture, how to avoid stale-data bugs, and cache invalidation patterns.

End-to-end traceability across Vue → BFF → upstream services using Azure Application Insights. Correlation IDs, structured logs with Serilog, custom telemetry, and Application Insights dashboards and alerts.

A layered testing strategy for the BFF. WebApplicationFactory for integration tests, Pact for consumer-driven contract testing with Vue.

Full IaaS deployment pipeline — building and tagging Docker images, publishing artifacts, and running the BFF on Azure Container Instances. Includes Azure Front Door routing and when API Management adds value vs noise.
