Tobias Dammers
Haskell Consultant at Well-Typed LLP
The Hague, South Holland, Netherlands
Summary
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Rockstar🎓
Top SchoolTobias Dammers is a Haskell consultant with 19 years of software experience, based in The Hague, combining deep functional programming expertise with practical back-end and DevOps skills. He has contributed performance-critical improvements to the Glasgow Haskell Compiler—optimizing register allocation, pretty-printing, and inlining behavior—demonstrating a focus on compiler efficiency and correctness. Tobias blends security-minded engineering (e.g., fixing XSS and hardening session/crypto handling) with quality-focused roles in QA, deployment automation, and developer coaching across startups and consultancies. A trained musician who has sustained a parallel career as a professional musician, he brings creativity, discipline, and a quick-learning, open-minded approach to complex technical challenges.
19 years of coding experience
9 years of employment as a software developer
Bachelor's degree, Music, Bachelor's degree, Music at ArtEZ Hogeschool voor de Kunsten
German, Dutch, English, Spanish
Stackoverflow
20,543reputation
4.9mreached
530answers
2questions
sql
top-5%
mysql
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git
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regex
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javascript
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foreign-keys
top-5%
Github Skills (36)
relationship10
bolt10
security10
type-system10
php10
xss10
ghc10
compiler-optimization10
performance-tuning10
functional-programming10
haskell10
mysql9
javascript9
git9
json9
Programming languages (16)
Github contributions (5)
ghc/ghc
Oct 2017 - Jul 2019
Mirror of the Glasgow Haskell Compiler. Please submit issues and patches to GHC's Gitlab instance (https://gitlab.haskell.org/ghc/ghc). First time contributors are encouraged to get started with the newcomers info (https://gitlab.haskell.org/ghc/ghc/wikis/contributing).
Role in this project:
Back-end Developer
Back-end DeveloperContributions:122 commits in 1 year 9 months
Contributions summary:Tobias primarily contributed to optimizing the Glasgow Haskell Compiler (GHC). Their work focused on improving compiler performance through code optimizations, including making the pretty-printer stricter, improving register allocation algorithms, and refactoring the `readField` functionality for deriving Read instances. They also addressed issues related to coercion roles and the inlining of zero-arity bindings, further enhancing the compiler's efficiency. The user also made changes to the `ghc-pkg` utility, specifically handling abi-depends correctly.
ghcget-startednewcomershaskellcabal
bolt/bolt
Sep 2013 - May 2014
Bolt is a simple CMS written in PHP. It is based on Silex and Symfony components, uses Twig and either SQLite, MySQL or PostgreSQL.
Role in this project:Back-end Developer
Back-end DeveloperContributions:66 commits in 7 months
Contributions summary:Tobias primarily focused on improving the Bolt CMS by fixing several XSS vulnerabilities in the `lowlevelchecks.php` file, enhancing security. They also addressed other minor issues, such as syntax errors and database migration problems, showing a focus on code quality and stability. Additionally, the user implemented improvements to the cryptographic key generation and session cookie settings.
cmsboltmysqltwigphp
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