Johannes Lund
Software Engineer at Cardano Foundation
Sweden
Summary
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Rockstar🎓
Top SchoolJohannes Lund is a pragmatic software engineer with 13 years of experience and nearly five years focused on Haskell and the Cardano ecosystem, now building at the Cardano Foundation after a multi-year tenure at IOHK. He brings systems thinking to backend development, having contributed significant wallet API, type-class refactoring, and backwards-compatibility work to the widely used cardano-sl project. Comfortable in cryptographic currency codebases, he blends deep functional programming expertise with practical engineering trade-offs. Based in Sweden and grounded in physics and maths coursework from Lund University, he often applies analytical rigor to real-world product constraints.
13 years of coding experience
5 years of employment as a software developer
Courses in physics and maths, Physics, Courses in physics and maths, Physics at Lund University
English, Swedish, German
Stackoverflow
1,917reputation
140kreached
17answers
18questions
Github Skills (18)
back-end-development10
cryptocurrency10
backend10
haskell10
json9
apidoc9
blockchain9
api9
data-structures8
data-structure8
macos6
uiscrollview6
uitableview6
uibutton6
cocoa6
Programming languages (10)
Github contributions (5)
input-output-hk/cardano-sl
Jul 2018 - Feb 2019
Cryptographic currency implementing Ouroboros PoS protocol
Role in this project:
Back-end Developer
Back-end DeveloperContributions:24 commits, 31 PRs, 176 pushes in 7 months
Contributions summary:Johannes primarily focused on modifying and improving the Cardano-SL wallet code, especially its API and internal logic. They worked on refactoring code, introducing and customizing type classes to manage data models, and improving compatibility by adjusting how the application parses and handles mnemonic words. Further changes were made related to ensuring backwards compatibility. The commits demonstrate their work on modifying the JSON representations and handling updates for wallet functionality.
cardanocryptographyposadacryptographic
Anviking/Decodable
Jul 2015 - Nov 2017
Contributions:17 releases, 437 commits, 84 PRs in 2 years 5 months
codableswiftjsonunmarshalling
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