Nikolaj Geisle
Developer at Umbraco
Odense, Region of Southern Denmark, Denmark
Summary
🤩
Rockstar🎓
Top SchoolNikolaj Geisle is a developer based in Odense with five years of hands-on experience building backend systems and contributing to open-source .NET projects. A UCL computer science student and current core team developer at Umbraco, he has shipped fixes that improved concurrency, validation, and middleware behavior in the widely used Umbraco CMS. He pairs practical logistics experience managing teams with clear communication in Danish and English, bringing an operational mindset to software delivery. At Umbraco he focuses on backend robustness—refactoring data structures and controllers to prevent subtle runtime issues. Comfortable in collaborative, open-source environments, he combines academic grounding with production-driven problem solving. Colleagues value him for digging into core framework code to resolve non-obvious bugs that improve reliability for many users.
5 years of coding experience
University College London
Stackoverflow
13reputation
37reached
0answers
1question
Github Skills (14)
net10
asp-net10
umbraco10
cms10
dotnet10
c-language10
c-programming10
cprogramming-language10
csharp10
dotnet-core10
concurrency9
asp-net-core9
asp-net-mvc6
forms6
Programming languages (5)
Github contributions (5)
umbraco/Umbraco-CMS
Aug 2021 - Jan 2023
Umbraco is a free and open source .NET content management system helping you deliver delightful digital experiences.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:3 releases, 367 reviews, 453 commits in 1 year 5 months
Contributions summary:Nikolaj's contributions focused on back-end development within the Umbraco CMS. They implemented fixes for concurrency issues by changing data structures and methods within the AspNetCoreHostingEnviroment. The user also addressed a bug in the validation process within the MemberController and resolved an issue with resolving UmbracoHelper in middleware. The changes involved modifying core files and ensuring correct functionality of the CMS.
cmscontent-management-systemheadless-cmsaspumbraco
umbraco/Umbraco.Playwright.Testhelpers
Mar 2022 - Nov 2022
Test helpers for our playwright acceptance tests
Contributions:11 reviews, 79 commits, 30 PRs in 8 months
acceptance-teststestinghelperstest-helpersplaywright
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