Michael Herzner
Senior Frontend Engineer at Freeletics
Greater Munich Metropolitan Area Germany
Summary
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Rockstar🎓
Top SchoolMichael Herzner is a Senior Frontend Engineer based in the Greater Munich area with 11 years of experience building user-facing web applications across startups and product companies. He has progressed from frontend developer roles to senior engineering at Freeletics, bringing practical expertise in shipping reliable, test-driven code. Beyond product work, Michael contributes to the Deno standard library as a QA/test automation engineer, improving coverage across core modules—a signal of his attention to edge cases and platform-level quality. His background blends formal vocational training in application development with earlier roles in marketing and travel commerce, which gives him a pragmatic, user-focused mindset when designing interfaces. Colleagues know him for combining hands-on frontend craft with a strong emphasis on automated tests and reliability.
11 years of coding experience
13 years of employment as a software developer
Reiseverkehrskaufmann, Reiseverkehrskaufmann at Städt. Berufsschule f. Spedition und Touristik MünchenFachinformatiker für Anwendungsentwicklung, Fachinformatiker für Anwendungsentwicklung at Städt. Berufsschule für kaufmännische Industrie- und Informatikberufe München
Japanese, German, English, French
Github Skills (7)
typescript10
deno10
javascript10
typescripts10
typescript-types10
test-automation10
testing10
Programming languages (3)
Github contributions (5)
denoland/std
Apr 2024 - Jun 2024
The Deno Standard Library
Role in this project:
QA Engineer / Test Automation Engineer
QA Engineer / Test Automation EngineerContributions:9 reviews, 10 PRs, 12 comments in 2 months
Contributions summary:Michael's commits primarily involve improving test coverage for the Deno standard library. Their contributions include writing new tests and enhancing existing ones across various modules, such as media types, async utilities, crypto functions, datetime formatting, and path manipulations. The changes involve adding tests for edge cases, validating expected behaviors, and ensuring code quality and reliability within the project. The user also contributes to tests for the core modules of the standard library, ensuring the library's robustness and correctness.
denotypescriptjavascript
mbhrznr/deno_std
Apr 2024 - Jul 2024
The Deno Standard Library
Contributions:42 pushes, 18 branches in 3 months
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