Stefan Holzapfel
Geschäftsführer at Selbständig
Vienna, Austria
Summary
👤
Senior🎓
Top SchoolStefan Holzapfel is a Vienna-based software entrepreneur and managing director with 11 years of experience building single-page applications and progressive web apps across the JavaScript ecosystem. As founder of just apps gmbh and a long-time freelance engineer/consultant, he combines hands-on implementation with tailored end-to-end solutions, including a modern invoicing product (justbusinesssuite.com). He holds an MSc in Software Engineering and blends frontend focus with backend chops—evidenced by contributions to the mingo in-memory MongoDB query library where he improved $sort collation behavior. Comfortable moving between consultancy and product leadership, he excels at turning complex client requirements into pragmatic, test-covered implementations.
11 years of coding experience
Master of Science (MSc), Software Engineering, Master of Science (MSc), Software Engineering at Fachhochschule Technikum Wien
German, English, French
Stackoverflow
374reputation
11kreached
6answers
8questions
Github Skills (13)
aggregation-framework10
javascript10
collation9
data-structures8
data-structure8
testing7
mouseleave6
angular-meteor6
typescript6
google-chrome6
mongodb-query6
mongodb6
mouseenter6
Programming languages (5)
Github contributions (5)
kofrasa/mingo
Aug 2020 - Sep 2020
MongoDB query language for in-memory objects
Role in this project:
Back-end Developer
Back-end DeveloperContributions:6 commits, 1 PR, 16 comments in 12 days
Contributions summary:Stefan primarily focused on refining the aggregation functionality within the mingo library, specifically regarding the `$sort` operator. Their contributions involved refactoring the collation options, moving them from a generic option to the config, and fixing import statements. The user added a test case to ensure the proper functioning of `$sort` operator with collation.
querymemorymongoose-pluginmongodb-queryquery-language
stefanholzapfel/lit-state
Aug 2020 - Jan 2023
Contributions:14 releases, 89 commits, 1 PR in 2 years 5 months
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