Kristofer Karlsson - Software Engineer at Spotify

Kristofer Karlsson

Software Engineer at Spotify

Greater Stockholm Metropolitan Area Sweden

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Summary

👤

Senior

🎓

Top School

Kristofer Karlsson is a seasoned software engineer with 16+ years building backend and data systems at Spotify since 2010, specializing in Python, Java, Postgres, Cassandra, Bigtable/Spanner, and asynchronous architectures. He pairs production experience in large-scale streaming and data pipelines (Apache Beam/Scio/Dataflow) with a long-standing open-source streak—leading high-performance projects like folsom (async Java memcached client) and Sparkey (large key-value store with a Java binding). Kristofer’s contributions span both systems-level C work and Java tooling, and he has applied his skills to community projects such as enhancing the widely used tvheadend DVR/timeshift features. A competitive programmer with multiple regional ACM appearances and two top-1000 Code Jam finishes, he brings algorithmic rigor to pragmatic system design. Based in Greater Stockholm, he combines deep backend craftsmanship with clear documentation and developer-focused learning resources, such as his Java futures guide.

16 years of coding experience

5 years of employment as a software developer

Civilingenjör, Computer science and engineering, Civilingenjör, Computer science and engineering at KTH Royal Institute of Technology

Github Skills (8)

c1710

extjs10

c1110

dvb10

vcr10

dvb-t10

mpeg2-ts9

json-api8

Programming languages (4)

JavaCLuaPython

Github contributions (5)

tvheadend/tvheadend

Nov 2012 - Jan 2013

Tvheadend is the leading TV streaming server for Linux with ATSC, DVB-C/C2, DVB-S/S2, DVB-T/T2, IPTV, SAT>IP and unix pipe input sources

Role in this project:

Back-end Developer

Contributions:12 commits in 1 month

Contributions summary:Kristofer primarily focused on enhancing the DVR functionality of the tvheadend project. They implemented features to split the recorder schedule view into upcoming, finished, and failed recordings. Furthermore, the user added the ability to sort the recordings by the start time. In addition, the user made improvements to the timeshift functionality.

unixpipetvheadendstreaming-serversat

krka/futures-guide

Oct 2019 - Aug 2022

Guide to Java 8+ futures

Contributions:3 reviews, 35 commits, 6 PRs in 2 years 10 months

javajava-8stock-tradingfutures

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