Kristofer Karlsson
Summary
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SeniorKristofer 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
Github Skills (8)
c1710
extjs10
c1110
dvb10
vcr10
dvb-t10
mpeg2-ts9
json-api8
Programming languages (4)
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
Back-end DeveloperContributions: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.
dvbdvb-tlinuxunixatsc
krka/adventofcode2019
Dec 2019 - Dec 2023
Contributions:192 pushes, 9 branches in 4 years 1 month
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