Andres Löh
Partner at Well-Typed LLP
Regensburg, Bavaria, Germany
Summary
🤩
Rockstar🎓
Top SchoolAndres Löh is a Partner at Well-Typed LLP and a veteran Haskell engineer with over 20 years of hands-on experience and 21 years in the field, combining consultancy, development and training for commercial projects. His work sits at the intersection of language design and practical tooling—specialising in datatype-generic programming, type systems, dependent types and embedded DSLs—and he has substantial academic experience from a PhD and faculty roles. Andres is a prolific open-source contributor to cornerstone Haskell projects such as Cabal, Servant, cabal2nix and Liquid Haskell, improving build systems, parsers and server routing with a focus on robustness and maintainability. He has a track record of pushing compiler and tooling support (including UHC support in Cabal) and applying research ideas to production-grade infrastructure. Based in Regensburg, Germany, he founded community initiatives like the Dutch Haskell Users Group and an annual Applied Functional Programming summer school, demonstrating both technical depth and community leadership. His background in mathematics and computer science informs a rigorous, design-oriented approach to modular, reusable software.
21 years of coding experience
3 years of employment as a software developer
Diplom Mathematics Computer Science, Diplom Mathematics Computer Science at University of KonstanzPhD Computer Science, PhD Computer Science at Utrecht University
German, English, Dutch
Github Skills (22)
api-rest10
parser10
package-management10
nix10
api-design10
restful-api10
build-system10
cabal10
rest-api10
haskell10
dependency-management9
routing-slip9
verification9
error-handling9
type-system9
Programming languages (14)
Github contributions (5)
haskell/cabal
Nov 2005 - Oct 2016
Official upstream development repository for Cabal and cabal-install
Role in this project:
Back-end Developer
Back-end DeveloperContributions:342 commits, 16 PRs, 14 pushes in 11 years
Contributions summary:Andres contributed significantly to the Cabal project, focusing on enhancing the build process and supporting additional compilers such as UHC. Their work includes implementing new functions within the build information structure, and addressing bugs related to file paths and dependency handling within different compiler backends. The user also added a new module for UHC compiler support, which included building, configuring, installing, and registering package features within the cabal-install environment.
cabal-installcabalhaskellhackage
haskell-servant/servant
May 2015 - Jan 2017
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:23 commits, 12 PRs, 14 pushes in 1 year 7 months
Contributions summary:Andres made significant contributions to the `servant` library, focusing on enhancing its server-side implementation. They introduced a new `Router` datatype for more efficient server interpretation, reducing routing complexity. The user also addressed error handling, test cases, and the implementation of API combinators such as authorization. The changes demonstrate a deep understanding of Haskell and web application server design principles.
dslhaskellmocking
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