Gerard Klijs

software engineer @ Alliander

Java and Kotlin for most of my career, Rust and Clojure in my free time. APIs of many kinds: REST, GraphQL, gRPC and async APIs on Kafka with Protobuf and Cloud Events.

LEGO Batman with a grappling gun, aimed at you

$ cd blog_

Words I typed, now with syntax highlighting

Notes on Kafka, Rust, event sourcing and whatever bug ate my afternoon. Occasionally correct, always compiled. I'm Batman, and so is my cape's CSS.

Grapple over to the blog

Projects

featured · pre-1.0 · MIT OR Apache-2.0

skilj

A Rust library for event-sourced applications on Postgres. Define events and commands, and skilj handles storage, consistency checks, and GraphQL and REST APIs.

Dynamic Consistency Boundaries: a command is decided against only the events it shares tags with, not a whole aggregate.
Per-person encryption and blind tags, so personal data can be forgotten.
Projections, snapshots, schedules, and bridges to Kafka, AMQP, NATS and Temporal.

Try it with only Rust installed, no database to set up:

cargo install cargo-generate
cargo generate --git https://github.com/gklijs/SkilJ.git \
  templates/skilj-template --name my-wallet
cd my-wallet && cargo run --bin server

GitHub crates.io docs.rs