Open Source
An inspired, customer focused community, dedicated to crafting solutions that redefine our industry.

Projects
Klarna is built of Open Source Software. We know the true value of it and that’s why we always want to contribute back to the community. Here are some of the projects we’re working on.
Erlang
circuit_breaker
★ 163An Erlang library for breaking out of faulty services
mnesia_eleveldb
★ 147An eleveldb backend for Mnesia
erlavro
★ 127Avro support for Erlang/Elixir
snabbkaffe
★ 45Collection of utilities for trace-based testing
bec
★ 38 BetaThe BitBucket Erlang Client
leveldb_manager
★ 30Small service for snapshotting eleveldb without stopping the Erlang node
avlizer
★ 19Avro Data Serializer for Erlang
JavaScript
Java
Alumni
These projects were born at Klarna, but have since ventured out in the world and started living their own lives.
kafkajs
★ 3050A modern Apache Kafka client for node.js
bull-board
★ 1406Queue background jobs inspector
brod
★ 607Apache Kafka client library for Erlang/Elixir
HiveRunner
★ 244An Open Source unit test framework for Hive queries based on JUnit 4 and 5
phobos
★ 214Simplifying Kafka for ruby apps
confluent-schema-registry
★ 124is a library that makes it easier to interact with the Confluent schema registry
kafka_protocol
★ 88Kafka protocol erlang library
People
There is a person behind the code. These are some of the people at Klarna that contribute to Open Source, here and elsewhere.
- Simon Hänisch
simonhaenisch
- Stefano Azzolini
lastguest
- Sergey Prokhorov
seriyps
- Sebastian Silbermann
eps1lon
- Terje Larsen
terlar
- Tommy Brunn
Nevon
- Juan Facorro
jfacorro
- Carlo Colombo
carlo-colombo
- Burkhard Reffeling
hardchor
- Sergio Crisostomo
SergioCrisostomo
- Joakim Uddholm
Tethik
- Waleed Ashraf
WaleedAshraf
- Tobias Kloht
tkloht
- Itamar Ben-Zaken
benzaita
- Günter Grodotzki
lifeofguenter
- Umut Canbolat
umutcanbolat
- António Almeida
antonioalmeida
- Pierre Wahlgren
Deschtex
- Mikael Pettersson
mikpe
- Hasan Güner
hasanguner
- Gabriele
gadiener
- Adnan Asani
adnasa
- Lorenzo Cestaro
lorenzocestaro
- Michael Kohler
MichaelKohler
- Martino di Filippo
MartinodF
- Igor
cra
- Case Taintor
ctaintor
- Vaibhav Arora
vaibhavar
- Taher Dhilawala
taher435
- Yurick
Yurickh