Julian Arni
Founder at garnix
Berlin, Germany
Summary
🤩
Rockstar🎓
Top SchoolJulian Arni is a founder and software engineer based in Berlin with 13 years of experience building developer-focused infrastructure and tooling. He now runs garnix, a Nix CI and hosting startup, blending operational reliability with developer ergonomics. Julian contributes to Haskell open source—most notably enhancing the widely-used servant DSL by expanding request-response syntax, parsing, and API-definition capabilities—showing an emphasis on robust, type-safe back-end interfaces. His background in philosophy from Harvard gives him a habit of precise abstractions and clear technical argumentation that surfaces in API design and code cleanup. Comfortable working deep in typed functional languages and production infrastructure, he brings a pragmatic, design-first approach to developer platform problems. Colleagues describe him as someone who pairs strong technical craft with an entrepreneurial drive to simplify complex build and deployment workflows.
13 years of coding experience
Bachelor's degree, Philosophy, Bachelor's degree, Philosophy at Harvard UniversityHigh School Diploma, High School Diploma at UWC Mahindra College
Github Skills (6)
type-system10
api-design10
haskell10
text-parsing9
parsing9
testing8
Programming languages (17)
Github contributions (5)
haskell-servant/servant
Oct 2014 - Apr 2022
Servant is a Haskell DSL for describing, serving, querying, mocking, documenting web applications and more!
Role in this project:
Back-end Developer
Back-end DeveloperContributions:4 reviews, 492 commits, 236 PRs in 7 years 7 months
Contributions summary:Julian contributed to the servant Haskell DSL project by adding new request-response syntax, basic QQ data types, and parsing functionality, and also adding a query parameter. Their work involved modifications to the core API files, and the example code, suggesting a focus on expanding the capabilities of the library. Furthermore, they worked on several fixes that included fixing a bug with the IsSubList type, and improving code comments. The user's contributions were focused on enhancing the API definition and parsing aspects of the library, with a touch of code cleanup.
dslhaskellmocking
plow-technologies/ble
Dec 2016 - Dec 2017
Contributions:133 commits, 14 PRs, 150 pushes in 11 months
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