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
★ 151An Erlang library for breaking out of faulty services
mnesia_eleveldb
★ 142An eleveldb backend for Mnesia
erlavro
★ 122Avro support for Erlang/Elixir
snabbkaffe
★ 38Collection 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
★ 18Avro 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
★ 2632A modern Apache Kafka client for node.js
bull-board
★ 1134Queue background jobs inspector
brod
★ 574Apache Kafka client library for Erlang/Elixir
HiveRunner
★ 245An Open Source unit test framework for Hive queries based on JUnit 4 and 5
phobos
★ 203Simplifying Kafka for ruby apps
confluent-schema-registry
★ 102is a library that makes it easier to interact with the Confluent schema registry
kafka_protocol
★ 81Kafka 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.
- Joel Arvidsson
oblador
- Ranieri Althoff
ranisalt
- Simon Hänisch
simonhaenisch
- Quil
robotlolita
- Stefano Azzolini
lastguest
- Sergey Prokhorov
seriyps
- Carlos Eduardo Arantes Ferreira
carantes
- Terje Larsen
terlar
- Robin Pokorny
robinpokorny
- Tommy Brunn
Nevon
- Juan Facorro
jfacorro
- Mathias Klippinge
klippx
- Burkhard Reffeling
hardchor
- Carlo Colombo
carlo-colombo
- Sergio Crisostomo
SergioCrisostomo
- Waleed Ashraf
WaleedAshraf
- Kiko
kikofernandez
- Tobias Kloht
tkloht
- Renan Mendes Carvalho
aitherios
- Luca Mattiazzi
lucamattiazzi
- Itamar Ben-Zaken
benzaita
- Umut Canbolat
umutcanbolat
- Winner Crespo
wistcc
- Günter Grodotzki
lifeofguenter
- Pierre Wahlgren
Deschtex
- António Almeida
antonioalmeida
- Hasan Güner
hasanguner
- Mikael Pettersson
mikpe
- Gabriele
gadiener
- Magnus Görlitz
maggy96