Matthijs Janssen
Assistant Professor at Dialogic innovatie & interactie
Randstad, Netherlands
Summary
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Rockstar🎓
Top SchoolMatthijs Janssen is an assistant professor and principal scientist with 10+ years blending academic research in evolutionary economics and innovation policy with hands-on software development in probabilistic and differential programming. He leads policy-relevant research at Utrecht University and Dialogic, advising governments and international organizations while exploring new methods for policy evaluation and industrial transition. Technically fluent, he contributes to open-source projects—most notably extending Stan with robust foreach loop semantics and improving backend trading infrastructure—demonstrating comfort with language semantics, AST work, and production systems. Based in the Randstad, he pairs a PhD in Innovation Sciences with practical experience building software for applied economics and reintegration, a mix that makes him effective at turning complex theoretical ideas into usable tools and policy insights.
10 years of coding experience
4 years of employment as a software developer
Doctor of Philosophy (Ph.D.), Innovation Sciences, Ph.D., Doctor of Philosophy (Ph.D.), Innovation Sciences, Ph.D. at Eindhoven University of TechnologyMaster2, Innovation dans les Services, Master2, Innovation dans les Services at Université des Sciences et Technologies de Lille (Lille I)BSc (cum laude), Innovation Sciences, BSc (cum laude), Innovation Sciences at Technische Universiteit Eindhoven
English, Dutch, French, German, Spanish
Github Skills (15)
pandas10
parse-tree10
code-generation10
c-language10
text-parsing10
parsing10
cprogramming-language10
python10
abstract-syntax-tree10
trading-systems10
data-analysis9
bayesian8
risk-management8
bayesian-statistics8
bayesian-inference8
Programming languages (9)
Github contributions (5)
stan-dev/stan
Nov 2017 - Jun 2019
Stan development repository. The master branch contains the current release. The develop branch contains the latest stable development. See the Developer Process Wiki for details.
Role in this project:
Backend Developer
Backend DeveloperContributions:79 commits, 8 PRs, 1 push in 1 year 7 months
Contributions summary:Matthijs's contributions focused on implementing a `foreach` loop feature within the Stan language, which involves changes to the grammar, abstract syntax tree (AST) nodes, and code generation mechanisms. The commits introduce new AST node types for different `foreach` loop variants, including array and matrix iterations, alongside corresponding modifications to the grammar to parse these constructs. The user worked on generating C++ code for these loop types and addressed issues like keyword overloading to ensure the correct functionality of `for` loops with arrays and matrices.
bayesian-inferencestanmasterbayesian-statisticsdetails
robcarver17/pysystemtrade
Aug 2022 - Sep 2022
Systematic Trading in python
Role in this project:Backend Developer
Backend DeveloperContributions:13 reviews, 7 commits, 24 PRs in 23 days
Contributions summary:Matthijs primarily contributed to the backend infrastructure of the trading system. Their work involved fixing issues related to the Interactive Brokers (IB) gateway, including order processing and market data retrieval. They added features like portfolio beta calculations and Australia's trading hours, enhancing the system's functionality. The user also made improvements to reporting components and optimized the roll status update process.
pythonalgorithmic-tradingsystematicautomated-tradingbacktesting-trading-strategies
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