Gustav Olsen
Software Developer at group.one
Copenhagen, Capital Region of Denmark
Summary
👤
Senior🎓
Top SchoolGustav Olsen is a seasoned software developer based in Copenhagen with 13 years of experience delivering web applications, migration projects and platform tooling across SaaS and hosting environments. He has led technical migrations, helped onboard acquired companies, and modernized legacy stacks by moving web apps into Kubernetes and creating a frontend platform that empowers teams to ship independently. Comfortable across the full stack, Gustav has hands-on experience with Node.js, React, build and CI systems, and operational security reviews tied to M&A and GDPR work. He contributes to open source testing tooling—improving reliability and coverage in projects like the widely used istanbul code-coverage tool—bringing a pragmatic, test-first mindset to engineering teams. His background in both computer science and geography hints at an analytical, systems-oriented approach combined with an appreciation for real-world context and cross-team collaboration.
13 years of coding experience
10 years of employment as a software developer
STX, Matematik A, Samfundsfag A, STX, Matematik A, Samfundsfag A at Næstved GymnasiumGeografi, Geografi at Københavns Universitet
Danish, English
Github Skills (7)
code-coverage10
nodejs10
javascript10
testing10
cli9
command-line9
command-line-interface9
Programming languages (10)
Github contributions (5)
gotwarlost/istanbul
Nov 2014 - Feb 2015
Yet another JS code coverage tool that computes statement, line, function and branch coverage with module loader hooks to transparently add coverage when running tests. Supports all JS coverage use cases including unit tests, server side functional tests and browser tests. Built for scale.
Role in this project:
Full-stack Developer
Full-stack DeveloperContributions:6 commits, 1 PR, 2 comments in 2 months
Contributions summary:Gustav primarily contributed to the testing and configuration of the `istanbul` code coverage tool. Their work involved adding tests to verify the `--include-all-sources` feature, ensuring that all source files are included in the coverage report. They also refactored the code to avoid reinstantiating transformers and instrumenters, and addressed a deprecated option. These changes improved the tool's functionality and reliability.
casesavabrowser-testsunitserver-side
unexpectedjs/unexpected-fs
May 2015 - Nov 2018
Mock filesystem for your assertions.
Contributions:64 commits, 6 PRs, 50 pushes in 3 years 6 months
assertionstestingmockingfilesystemmock
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