Ole Halvorsen
Senior Backend Engineer at Customer.io
Norway
Summary
👤
Senior🎓
Top SchoolOle Halvorsen is a Senior Backend Engineer with 17 years of experience building reliable, high-performance services, currently working at Customer.io and based in Norway. He specializes in Elixir and Go while maintaining fluency across a broad polyglot stack including PHP, Python, Ruby, JavaScript, Swift and Objective-C. His career spans product-focused roles at Sketch and long-term contributions to platforms like eZ Publish, where he improved cache stability and compatibility with newer MySQL versions—work that reflects a pragmatic focus on correctness and operational robustness. A board member of Safir Web AS, he combines hands-on engineering with strategic oversight and mentorship. Comfortable across web, backend and native Cocoa/Cocoa Touch ecosystems, he brings deep systems thinking to shipping resilient distributed systems. Colleagues know him as a practical developer/geek who quietly prioritizes stability and measurable performance gains over flashy rewrites.
17 years of coding experience
15 years of employment as a software developer
IKT Driftsoperatør, IKT Driftsoperatør at Telemark tekniske fagskole
English, Norwegian
Stackoverflow
1reputation
0reached
0answers
0questions
Github Skills (7)
caching10
cms10
php10
cachemanager10
mysql10
database-design9
deprecated8
Programming languages (11)
Github contributions (5)
ezsystems/ezpublish-legacy
Oct 2011 - Oct 2018
eZ Publish (aka "legacy kernel" + 3 core "legacy extensions") NOTE: Succeeded by eZ Platform, no further feature releases planned.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:1 review, 7 commits, 5 PRs in 7 years
Contributions summary:Ole primarily focused on improving the performance and stability of the eZ Publish legacy system. Their contributions included optimizing cache clearing mechanisms, preventing race conditions during cache generation, and implementing atomic cache writes to prevent data corruption. Furthermore, the user addressed compatibility issues with newer MySQL versions by making necessary query adjustments. They also fixed errors in existing code, such as correcting incorrect loop usage.
ezplatformezpublishkernelphpcms
omh/dotfiles
May 2015 - Apr 2026
My dotfiles and vim config
Contributions:2 PRs, 84 pushes, 2 branches in 11 years 1 month
vim
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