While building haskcore - an IDE for Haskell on Compose Desktop - I extracted rules that allowed me to create an architecture of 40 isolated modules, where each module knows only what it needs.

That's how FLIP - Feature-Layered Isolated Platform - was born.

The main problem I faced during development: horizontal dependencies make the system fragile . The solution - strict vertical hierarchy.

FLIP consists of the following isolated modules:

:common:core - common logic components.

:common:presentation - common UI components.

:service - UI-less domain module. Provides a service interface.

interface SeedService : AutoCloseable { val seed : Flow < Seed >

suspend fun generateSeed (): Either < Throwable , Unit > }

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:feature:core — logic module of a UI-feature. Knows nothing about other features. Uses services from :service . Provides use cases.

class GenerateRemoteRandomSeed ( private val seedService : SeedService ) : UseCase .…