Mosaic: A Kotlin Framework for Decoupling BFF API Orchestration Logic

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The article introduces Mosaic, a new Kotlin framework built to manage business logic in complex backend-for-frontend orchestration APIs. Developers write small, composable "tiles" that run in parallel, avoid duplicate calls, and declare dependencies on one another. Mosaic assembles a request tree dynamically for each request, aiming to replace sprawling conditional logic with testable, decoupled components. It is positioned as a complement to existing web frameworks such as Ktor, Micronaut, and Spring rather than a replacement. The authors point to examples and a quick start guide for developers looking to adopt it.

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