Julian Ospald
Software Engineer at DURIAN CONSULTING PTE. LTD.
Taipei, Singapore
Summary
🤩
Rockstar🎓
Top SchoolJulian Ospald is a Haskell-focused software engineer with 12 years of experience building backend systems, fintech infrastructure, and robust tooling for developer workflows. He authored GHCup, maintains core Haskell libraries, and has a strong track record improving CI/CD, build automation, and release pipelines for high-profile projects like Cabal, Stack, and the Haskell Language Server. Comfortable in loose, asynchronous open-source communities since his Gentoo days, he prioritizes ergonomic workflows, clear communication, and developer experience. His professional background spans traditional and blockchain fintech, including contributions to cardano-wallet and performance work on bytestring, showing both domain depth and low-level optimization skills. Now based in Taipei, he prefers backend work and tooling over front-end development and is frequently active in Haskell meetups and conferences. An avid open-source maintainer, he blends pragmatic engineering with a long-term commitment to reproducible, cross-platform developer environments.
13 years of coding experience
12 years of employment as a software developer
Oberschule zum DomBachelor’s Degree, Computer Science, Bachelor’s Degree, Computer Science at Hochschule Bielefeld
German, English, Latin
Stackoverflow
563reputation
10kreached
13answers
1question
Github Skills (56)
github-ci10
docker10
gitlab-ci10
scripting10
apidoc10
stack10
linux10
bash10
build-system10
stacker10
dockers10
data-structure10
cicd10
bytestring10
gitlab10
Programming languages (47)
Github contributions (5)
prism-break/prism-break
Jul 2013 - Mar 2018
Privacy/security-oriented software recommendations (mirrored from GitLab)
Role in this project:
Full-stack Developer
Full-stack DeveloperContributions:22 commits, 7 PRs, 413 comments in 4 years 8 months
Contributions summary:Julian primarily contributed to the project by adding and modifying content within the `index.html` file. These changes involved incorporating information and recommendations about privacy-focused software and services, specifically related to messaging applications and digital distribution platforms. The user added new sections to the website and clarified existing notes, expanding the repository's coverage of privacy-enhancing alternatives. The commits suggest an interest in providing comprehensive and up-to-date information on privacy-related topics.
gitlabsecurity
cardano-foundation/cardano-wallet
Aug 2020 - Feb 2021
HTTP server & command-line for managing UTxOs and HD wallets in Cardano.
Role in this project:Back-end Developer
Back-end DeveloperContributions:324 reviews, 143 commits, 47 PRs in 6 months
Contributions summary:Julian primarily focused on improving the `cardano-wallet`'s back-end functionality. They implemented error handling for `PastHorizonException`, modifying API server code to return appropriate HTTP status codes and improved error messages. Furthermore, the user made significant contributions to the stake pool functionality, including the addition of endpoints for maintenance actions. They also addressed issues related to the database and token bundles.
cardanocommand-linehttp-server
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