Stefan Daschek
Geschäftsführer at Büro DIE ANTWORT GmbH
Vienna, Austria
Summary
🤩
RockstarStefan Daschek is a Vienna-based technology leader and Geschäftsführer with 15 years of hands-on software engineering and product delivery experience. He combines entrepreneurial management with deep back-end expertise, contributing to well-known Ruby libraries for reliable XLSX generation and robust test automation. His open-source work shows a focus on correctness and developer ergonomics—fixing data type bugs, improving chart and layout support, and adapting test suites to modern RSpec metadata. Stefan’s trademark is pragmatic engineering: simplifying complex file formats and edge cases so clients get predictable outputs. Comfortable leading a company since 2004, he balances business strategy with code-level attention to detail. Colleagues describe him as a “hacker” in the best sense—curious, thorough, and focused on making systems behave.
15 years of coding experience
Stackoverflow
376reputation
3kreached
12answers
0questions
Github Skills (23)
rubygems10
testing10
rspec10
test-framework10
capybara10
ruby10
error-handling10
test-automation10
unit-testing9
xml9
optimization8
optimisation8
algorithms8
numerical-optimization8
code-optimization8
Programming languages (12)
Github contributions (5)
caxlsx/caxlsx
Sep 2019 - Sep 2022
xlsx generation with charts, images, automated column width, customizable styles and full schema validation. Axlsx excels at helping you generate beautiful Office Open XML Spreadsheet documents without having to understand the entire ECMA specification. Check out the README for some examples of how easy it is. Best of all, you can validate your xlsx file before serialization so you know for sure that anything generated is going to load on your client's machine.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:36 reviews, 48 commits, 52 PRs in 3 years
Contributions summary:Stefan primarily contributed to fixing bugs and improving the code quality of the `axlsx` gem, which generates XLSX files. Their contributions involved refactoring existing code by removing unused modules and fixing typos. Furthermore, the user addressed issues related to data type handling, specifically for floating-point numbers and chart titles, leading to more accurate XLSX generation. This demonstrates a focus on the correctness and reliability of the library.
xlsxruby-gemwidthbest-ofoffice-open-xml
randym/axlsx
Feb 2012 - Nov 2019
xlsx generation with charts, images, automated column width, customizable styles and full schema validation. Axlsx excels at helping you generate beautiful Office Open XML Spreadsheet documents without having to understand the entire ECMA specification. Check out the README for some examples of how easy it is. Best of all, you can validate your xlsx file before serialization so you know for sure that anything generated is going to load on your client's machine.
Role in this project:Back-end Developer
Back-end DeveloperContributions:26 commits, 4 PRs, 2 pushes in 7 years 10 months
Contributions summary:Stefan primarily contributed to the Axlsx library by adding features and fixing bugs related to generating Excel files. Their work included implementing support for page margins, underlined text, and custom row heights within worksheets. They also addressed issues with merged cells and fixed the default values for left/right margins, improving the library's functionality and reliability.
xlsxwidthbest-ofoffice-open-xmlvalidate
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