Marcel Otto
Open Source Developer at Ninja Concept GmbH
Bielefeld, North Rhine-Westphalia, Germany
Summary
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Rockstar🎓
Top SchoolMarcel Otto is an open source developer with 13 years of software engineering experience, based in Bielefeld, Germany, and a long-standing interest in Semantic Web technologies and Elixir. He created the RDF on Elixir libraries and the Ontogen version control system, blending research-grade ontology work with practical tooling. Marcel has a steady track record across academia, startups, and foundations—including roles at NLnet, Ninja Concept, and multiple German universities—bringing deep familiarity with data interoperability and knowledge representation. Trained in computer science and philosophy, he combines formal thinking with pragmatic engineering, often exploring conceptual questions as a hobby philosopher. His work reflects a preference for building reusable, community-oriented open source infrastructure rather than single-product apps.
13 years of coding experience
22 years of employment as a software developer
Computer Science & Philosophy, Computer Science & Philosophy at University of Paderborn
Stackoverflow
31reputation
710reached
1answer
0questions
Github Skills (121)
table-of-contents10
semantic-web10
sequence-diagram10
code-analysis10
commonmark10
haskell10
markdown10
javascript10
markup-language10
knowledge-graph10
scalable10
markup10
elixir10
graph10
typescript10
Programming languages (8)
Github contributions (5)
marcelotto/magma
Nov 2023 - Feb 2026
An IDE for prompts
Contributions:4 PRs, 34 pushes, 6 branches in 2 years 3 months
ideknowledge-workclaude-codecoding-agentsknowledge-graphs
marcelotto/spread2rdf
Sep 2013 - Feb 2014
Contributions:45 commits in 5 months
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