Mathias Lorenzen
CTO at Reshopper
Aarhus, Central Denmark Region
Summary
🤩
Rockstar🎓
Top SchoolMathias Lorenzen is a pragmatic CTO and full-stack engineer with 11+ years of experience building scalable web and cloud systems across roles from lead engineer at LEGO to founding startups and consulting. He blends architecture, DevOps, .NET (C#) and React expertise with a practical, hands-on approach—designing APIs, scalable webhook systems and improving testability and observability in production. A prolific open-source maintainer with over 100 packages on NPM and NuGet (1.5M+ NuGet downloads and usage by AWS), he contributes to notable repos like dotnet/pinvoke and DefinitelyTyped. He thrives in creative, collaborative environments, embraces new technologies quickly, and balances decisive leadership with receptiveness to feedback. Outside work he’s a drummer, hiker and board-game enthusiast, bringing an ENFP-driven curiosity and people-first mindset to technical leadership.
11 years of coding experience
17 years of employment as a software developer
Bachelor's degree, Computer Science, Bachelor's degree, Computer Science at Aarhus UniversityGrenå Tekniske SkoleComputer Science, Computer Science at Aarhus Business College
English, Danish, German
Stackoverflow
15,378reputation
5.6mreached
135answers
324questions
javascript
top-5%
Github Skills (31)
static-typing10
typesc10
wp-api10
titanium10
net10
typescript10
dotnet10
typescript-definitions10
winapi10
interop10
type-definition10
alloy10
asp-net10
type-system10
titanium-alloy10
Programming languages (27)
Github contributions (5)
DefinitelyTyped/DefinitelyTyped
May 2015 - Dec 2019
The repository for high quality TypeScript type definitions.
Role in this project:
Full-stack Developer
Full-stack DeveloperContributions:18 commits, 18 PRs, 54 comments in 4 years 7 months
Contributions summary:Mathias primarily contributed to the TypeScript type definitions for the Alloy framework, a UI framework for the Titanium mobile app development platform. Their work involved adding, correcting, and updating type definitions, ensuring compatibility and accuracy. They also fixed linting issues, typos, and removed redundant keywords within the TypeScript definitions to improve the quality of the project. The commits show updates and corrections to both the Alloy and Titanium typings.
typescript-definitionstype-definitionshigh-qualitydtsdefinitions
dotnet/pinvoke
Aug 2014 - Aug 2014
A library containing all P/Invoke code so you don't have to import it every time. Maintained and updated to support the latest Windows OS.
Role in this project:Back-end Developer
Back-end DeveloperContributions:15 commits, 1 PR, 37 comments in 2 days
Contributions summary:Mathias contributed to a P/Invoke library, focusing on adding and modifying methods for interacting with the Windows API. Their work involved defining external methods and corresponding enums within C# to enable interoperation with the Windows operating system. The commits demonstrate a focus on expanding the library's functionality by incorporating various Windows API calls, such as SetWindowLong, GetWindowLong, SetWindowPos, SetParent, FindWindowEx, ShowWindow, and GetForegroundWindow. The user added new features to the library by modifying the existing project files (.csproj) and adding new methods.
dotnetwindowsos-windowspinvokeupdated
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