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Github profile page for Gerard Klijs

I've been doing Java and Kotlin for most of my career. Doing Clojure and Rust in my free time, and dabbled a bit with Node.js. I have experience with several types of API's. Using REST based on OpenAPI, GraphQL, and async API's based on Kafka in formats like Protobuf and Cloud Events. For BKES I used gRPC. I created and maintain a Rust library to use schema registry schema_registry_converter.

I've presented on using GraphQL with Apache Kafka at GraphQL Summit 2019. I also presented at Kafka Summit 2020 and Kafka Summit 2021, and some others. I'm trying to write more blogs, I've written some at Dev.to. There are also two blogs I wrote in cooperation with Confluent, using Rust with Kafka and using GraphQL with Kafka. There is also one about the background of the Rust library on the Open Web blog page.

You can find me on Twitter and LinkedIn. Currently I'm working for AxonIQ, mostly working on the Axon Framework

As you might have guessed frontend isn't my strong suit. I do plan to have something more fancy at some time in the future trough. Likely using Bulma just like for the pokequiz I once made. I also track my bass progression, or stagnation here.

Gerard Klijs's Projects

kotlin-coroutines-demo icon kotlin-coroutines-demo

Demo project to simulate different kinds of java API calls, and how to handle them nicely with coroutines.

lacinia icon lacinia

GraphQL implementation in pure Clojure

meet-graphql icon meet-graphql

A library focussing on graph databases and querying them using GraphQL using a meetup like application.

mv icon mv

Source of website for Martha's Venue offerring a microcms for editing and static generation for production

nginx-clojure icon nginx-clojure

Nginx module for embedding Clojure or Java or Groovy programs, typically those Ring based handlers.

notjava icon notjava

Used as introduction to Rust for Java Developers.

obm_confluent_blog icon obm_confluent_blog

Open Bank Mark as will be used for the Confluent Blog, with ssl and multiple types in the same topic.

open-bank-mark icon open-bank-mark

A bank simulation application using mainly Clojure, which can be used to end-to-end test and show some graphs.

pokequiz icon pokequiz

Small game in development, using the https://github.com/PokeAPI/pokeapi for data

qdrant icon qdrant

Qdrant - vector similarity search engine with extended filtering support

rust-rdkafka icon rust-rdkafka

A fully asynchronous, futures-based Kafka client library for Rust based on librdkafka

rusty-confluent icon rusty-confluent

Test implementation of using rust to work with JVM based Confluent Kafka

schema_registry_converter icon schema_registry_converter

A crate to convert bytes to something more useable and the other way around in a way Compatible with the Confluent Schema Registry. Supporting Avro, Protobuf, Json schema, and both async and blocking.

schema_registry_test_app icon schema_registry_test_app

Java Application that consumes different types of messages supported by Schema Registry, and produces a similar kind to the same topic.

snake icon snake

Building on with the snake project, but now with a server-side part

tutorials icon tutorials

Just Announced - "Learn Spring Security OAuth":

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