Show HN: Runlet – Embeddedable JVM Pipelines

Category: library

Tags: stream-processing, jvm-library, kotlin

Score: 5.3/10 (Innovation: 4, Technical: 6, Documentation: 6, Utility: 5)

Runlet is an embedded JVM library for batch-oriented stream processing pipelines, providing a structured alternative to hand-written loops or Flow without the overhead of distributed systems like Flink or Kafka Streams. It offers checkpointed execution, a type-safe DSL, and Spring Boot integration, making it useful for local or embedded data processing jobs. While still pre-release with limited connectors, it fills a niche for simple, ordered stream processing within a single process.

Target audience: backend devs, data engineers

Repository: https://github.com/tjb/Runlet · Kotlin · Apache-2.0 · 3 stars

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