Andreas Karlsson
Principal Engineer at Percona
Stockholm, Stockholm County, Sweden
Summary
👤
Senior🎓
Top SchoolAndreas Karlsson is a Principal Engineer based in Stockholm with 17 years of hands-on experience building performant systems in C and Ruby and deep competence in PostgreSQL. He combines long-term product work as owner/consultant and entrepreneur—developing Photoshop plugins in C/C++ and running his own consulting firm—with senior engineering roles at Web Lovers and Percona. Comfortable across low-level systems and application stacks, Andreas is known for pragmatic problem solving, strong SQL tuning skills, and an ability to translate complex requirements into maintainable code. His background from KTH and sustained freelance work reveal both academic grounding and an entrepreneurial streak that keeps him shipping production-quality software.
17 years of coding experience
5 years of employment as a software developer
KTH Royal Institute of Technology
Github Skills (155)
ruby10
postgresql-extension10
encryption10
plpgsql10
sql10
rust10
database10
postgresql-database10
mysql10
sequel10
ssl10
percona10
decryption10
cryptography10
crypto9
Programming languages (15)
Github contributions (5)
jeltz/postgres
Jan 2015 - Apr 2025
Contributions:4 PRs, 447 pushes, 217 branches in 10 years 4 months
jeltz/advent
Dec 2020 - Dec 2024
Contributions:19 pushes, 1 branch in 4 years
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