Jos Warmer
All-in-one Language Engineer at OpenModeling
Utrecht Area Netherlands
Summary
👤
Senior🎓
Top SchoolJos Warmer is an experienced language engineer and entrepreneur with 30+ years in software engineering and 14 years focused on language- and model-driven development. He leads LionWeb and OpenModeling initiatives to connect modeling tools and web-based projectional editors, turning MDD/MDA concepts into practical DSLs that let business experts specify and validate domain logic. His work spans JetBrains MPS, Xtext, EMF, Graphiti and many modeling frameworks, and includes building projectional web editors and visual insurance workbenches for enterprise clients like Mendix, Itemis/Siemens and the Dutch Tax Office. A former contributor to the UML/OCL standard and co-author of "MDA Explained", he combines deep formal modeling expertise with pragmatic product delivery. Based in Utrecht, he focuses on automating the development lifecycle to empower domain specialists rather than just developers.
15 years of coding experience
2 years of employment as a software developer
AdelbertusschoolDrs (Masters), Mathematics and Computer Science, Drs (Masters), Mathematics and Computer Science at University of AmsterdamAdelbertus
English
Stackoverflow
21reputation
1kreached
0answers
1question
Github Skills (58)
hugo10
javascript10
software-design10
dsl10
typescript10
editor10
language-modeling10
workbench10
svelte10
documentation10
modeling-tool9
mendix9
discrete-event-simulation9
modeling9
extensible9
Programming languages (12)
Github contributions (5)
freon4dsl/Freon-example
Oct 2019 - Oct 2025
An example project showing how to build a complete language including a projectional editor with Freon
Contributions:10 PRs, 55 pushes, 37 branches in 6 years
projectional-editoreditor
LionWeb-io/lionweb-freon-m3
Aug 2023 - May 2026
Freon implementation of the LIonWeb M3, provides editor for LIonWeb languages/metamodels.
Contributions:4 reviews, 8 PRs, 52 pushes in 2 years 9 months
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