Carl-erik Kopseng - Mover Of Bits (honestly, I Don't Remember) at Mestergruppen AS

Carl-erik Kopseng

Mover Of Bits (honestly, I Don't Remember) at Mestergruppen AS

Oslo, Norway

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Summary

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Rockstar

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Top School

Carl-erik Kopseng is a pragmatic, product-minded tech lead with 15 years of experience turning ambiguity into working, maintainable systems across startups and large enterprises from Oslo. He blends full-stack engineering, architecture and hands-on ops—having migrated critical systems (e.g., Meteor to Java/Postgres), managed portfolios of 17 codebases, and led fast test-suite transformations to improve reliability and delivery. A seasoned consultant and early employee at successful health-tech Diffia, he’s equally comfortable refactoring open-source projects like penthouse and fixing subtle timing bugs in fake-timers, demonstrating a knack for making complex codebases modular and resilient. Known for practical coaching and clear technical ownership, he pairs deep systems knowledge with a teacher’s background, often surfacing better test and deployment practices across teams. Notably, his GitHub motto—"If it runs, I can kill -9 it"—captures a dry humor and a preference for pragmatic, effective solutions.

15 years of coding experience

15 years of employment as a software developer

Vienna University of Technology

Bachelor of Science - BS Språkteknologi, Bachelor of Science - BS Språkteknologi at University of Oslo

C, C at SAMS Teach Yourself C in 21 Days

Norwegian University of Science and Technology

German

Stackoverflow

Stats

21,768reputation

4.4mreached

250answers

271questions

Badges

webdriver

top-5%

npm

top-5%

selenium

top-5%

facebook

top-5%

java

top-5%

chai

top-5%

Github Skills (32)

javascript10

testing10

css10

macos10

nodejs10

webdriver9

selenium9

puppeteer9

npm9

unit-testing9

json9

java9

facebook9

cxf9

linux9

Programming languages (32)

C#CMakefileElmGoHTMLErlangTypeScript

Github contributions (5)

sinonjs/fake-timers

Sep 2015 - Dec 2022

Fake setTimeout and friends (collectively known as "timers"). Useful in your JavaScript tests. Extracted from Sinon.JS

Role in this project:

Full-stack Developer

Contributions:7 releases, 77 reviews, 231 commits in 7 years 4 months

Contributions summary:Carl-erik primarily focused on enhancing the `fake-timers` library by addressing bug fixes and improving overall functionality. They contributed to the project by implementing a fix for a breaking issue related to `setImmediate` and added a built bundle. The user also addressed a pull request related to BitHound errors and incorporated line comments for ESLint to improve code quality.

setintervaljavascriptsettimeoutsinontimers

pocketjoso/penthouse

Jun 2014 - Feb 2015

Generate critical css for your web pages

Role in this project:

Full-stack Developer

Contributions:10 commits, 1 PR, 41 comments in 8 months

Contributions summary:Carl-erik primarily refactored the project into a modular structure, enabling independent use as a Node module. They added functional tests to ensure code reliability, improved argument handling for viewport resolution, and streamlined the package configuration. The user also addressed reported issues, including those related to binary installation and documentation, thereby improving usability and maintainability.

criticalcsspuppeteerperformancenodejs

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