Make Invalid Domain States Hard to Represent with Kotlin and Arrow
Using value classes, context parameters and typed errors to build a small functional domain model
Aug 24, 20267 min read7
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#kotlin
Articles tagged with #kotlin
Stop External Services from Breaking Your Build with JUnit Tags
Keep everyday tests fast and dependable while running strict live integration tests only when you choose
Aug 20, 202611 min read13
PgBouncer with Spring Boot 4: Setup, Gotchas, and the Proof
Part 2: Add transaction pooling to the benchmark app, avoid prepared-statement traps, and see where connection pooling earns its keep
Aug 17, 20266 min read60
I Built a Spring Boot 4 App to Put PgBouncer to the Test
Part 1: Build a production-style Kotlin testbed with hexagonal architecture, PostgreSQL, Testcontainers, and a repeatable concurrency benchmark
Aug 17, 20269 min read18
Guardrails for AI-Generated Kotlin with detekt and ktlint
Turn your coding standards into checks that both developers and AI agents must pass
Aug 10, 202611 min read36
Fan-in with Kotlin Coroutines and Flow
Sometimes you need to start several pieces of work at the same time and handle each result as soon as it is available. The fan-in pattern is a good fit for this: many concurrent producers send their r
Jul 22, 20266 min read12