Sebastian Hess
Referent Energiehandel at EnBW
Karlsruhe, Baden-Württemberg, Germany
Summary
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Rockstar🎓
Top SchoolSebastian Hess is an energy trading professional and software-savvy industrial engineer with 14 years of technical experience, currently working as Referent Energiehandel at EnBW in Karlsruhe. He combines rigorous engineering training from KIT and Universidad Pontificia Comillas with hands-on systems and compiler work, having contributed backend fixes and language proposals to notable open-source compilers like GHC and the LLVM-based D compiler (LDC). His contributions to GHC—shaping unlifted datatypes and language semantics—signal a deep comfort with language design and performance-sensitive low-level coding that most energy traders do not typically possess. Sebastian’s background spans applied research roles at KIT, consultancy, and industry internships, giving him a pragmatic, cross-disciplinary approach to problem solving. He brings a rare blend of domain knowledge in energy markets and proven low-level software engineering chops, able to translate complex technical constraints into operational improvements.
14 years of coding experience
Master's degree, Industrial Engineering, Master's degree, Industrial Engineering at Universidad Pontificia Comillas ICAI-ICADEMaster's degree, Industrial Engineering and Management, Master's degree, Industrial Engineering and Management at Karlsruher Institut für Technologie (KIT)
German, English, Spanish
Github Skills (16)
type-system10
compiler10
low-level-programming10
compiler-compiler10
language-design10
haskell10
ghc10
llvm10
assemble9
assembler9
performance-optimization9
data-structure9
assembly9
data-structures9
float328
Programming languages (30)
Github contributions (5)
ghc-proposals/ghc-proposals
Aug 2019 - Jan 2020
Proposed compiler and language changes for GHC and GHC/Haskell
Role in this project:
Back-end Developer
Back-end DeveloperContributions:83 reviews, 28 commits, 5 PRs in 5 months
Contributions summary:Sebastian primarily contributed to the definition and refinement of unlifted datatypes for the GHC Haskell compiler. Their work involved proposing and specifying changes to the language's syntax and semantics. The contributions include defining new keywords and grammar rules, along with updates to the dynamic semantics. They were heavily involved in proposing and implementing data structure improvements for performance.
language-changesghchaskellcabalcompiler
ldc-developers/ldc
Jan 2013 - Jan 2013
The LLVM-based D Compiler.
Role in this project:Back-end Developer
Back-end DeveloperContributions:5 commits in 4 days
Contributions summary:Sebastian primarily contributed to the LDC compiler, focusing on low-level system aspects. Their commits include modifications to assembly code related to floating-point operations, specifically addressing issues with register usage on x64 architecture, and implementing fixes for struct member initializers. Further changes involved optimizing code related to static arrays and struct literals.
compilerldcdlangllvmd
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