Johannes Ewald
Founder at peerigon
Augsburg, Bavaria, Germany
Summary
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RockstarJohannes Ewald is a founder and seasoned full‑stack engineer based in Augsburg, Germany, with 14 years of experience building developer tools and improving web tooling. As co‑founder of peerigon and a member of the webpack team, he contributes to high‑impact open source projects that power modern JavaScript bundling and CSS preprocessing. His work spans backend test utilities (rewire), CLI tooling (updtr), and loader ecosystems (sass-loader, less-loader, loader-utils), demonstrating a knack for making developer workflows more robust and user-friendly. Johannes often focuses on testability, options consistency, and developer UX—refactoring internals, adding source maps, and improving CI reporting—skills that quietly elevate large ecosystems.
14 years of coding experience
Stackoverflow
17,745reputation
2.3mreached
60answers
6questions
coffeescript
top-5%
npm
top-5%
dependency-injection
top-5%
webpack
top-1%
javascript
top-1%
requirejs
top-5%
Github Skills (44)
asynchronous10
unit-testing10
javascript10
npm10
jquery10
async10
testing10
css10
configuration-management10
sass10
sourcemaps10
sc10
libsass10
webpack10
scs10
Programming languages (17)
Github contributions (5)
webpack/sass-loader
Mar 2014 - Aug 2018
Compiles Sass to CSS
Role in this project:
Front-end Developer
Front-end DeveloperContributions:28 releases, 291 commits, 142 PRs in 4 years 5 months
Contributions summary:Johannes's contributions primarily focused on modifying the test suite for the Sass loader. They refactored the tests, added source map support, and fixed typos. They also made changes to how the loader handled imports, ensuring correct behavior with both regular and special-cased CSS imports and module resolution. These changes indicate a focus on improving the loader's functionality and ensuring its reliability through comprehensive testing.
csssasswebpack-loaderscssloader
peerigon/updtr
Oct 2015 - Oct 2018
Update outdated npm modules with zero pain™
Role in this project:Full-stack Developer
Full-stack DeveloperContributions:6 releases, 47 commits, 24 PRs in 3 years
Contributions summary:Johannes focused on improving the `updtr` tool, making updates to the codebase. Their contributions included refactoring the code to use async `child_process.exec()` and adding the `cli-spinner` library to enhance the user experience. Furthermore, they fixed a counter and integrated tabs into the console output for improved readability and also added a basic reporter for CI environments. They also separated the runner and reporter and styled the default reporter output.
npm
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