Dennis Diefenbach
CEO & CTO at The QA Company
Saint-Étienne, Auvergne-Rhône-Alpes, France
Summary
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Senior🎓
Top SchoolDennis Diefenbach is a PhD researcher-turned-founder with 11 years of experience building practical question-answering systems and semantic data solutions. As CEO & CTO of The QA Company he leads development of production-grade QA and chatbot applications that extract answers from structured sources like databases, CSV/JSON and catalogs. His background blends deep mathematical training (MSc/BSc in mathematics, pre-degree in physics) with doctoral research in computer science, enabling a rigorous approach to NLP, knowledge management and semantic search. Past roles at PULSALYS, SAP and IBM include research and prototype systems such as a SPARQL endpoint on SAP HANA and data-mining algorithm implementations, showing he moves ideas from lab to product. Based in Saint-Étienne, France, he combines entrepreneurial leadership with hands-on research engineering, often tackling the less obvious challenge of turning formal academic techniques into robust enterprise software.
11 years of coding experience
Doctor of Philosophy - PhD Informatik, Doctor of Philosophy - PhD Informatik at Université de LyonMaster of Science in mathematics with specialization in algebra geometry and computer algebra Mathematik, Master of Science in mathematics with specialization in algebra geometry and computer algebra Mathematik at RPTU Kaiserslautern-Landau
English, Italian, German, French
Github Skills (200)
semantic-web10
triple10
graph-database10
shacl10
compression10
triplestore10
methodology10
wikidata10
crossword10
java10
geosparql10
rdf10
full-text-search10
sparql10
reconciliation10
Programming languages (11)
Github contributions (5)
kohesio/wikibase-api
Jun 2020 - Jan 2023
APIs serving Kohesio's frontend
Contributions:551 commits, 6 PRs, 367 pushes in 2 years 7 months
apiservingjavascriptnodejsfrontend
askplatypus/wikidata-simplequestions
Jul 2017 - Jun 2021
Mapping of the SimpleQuestions dataset to Wikidata
Contributions:19 commits, 1 PR, 11 pushes in 3 years 11 months
mappingdatasetwikidata
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