Josef Hardi
Senior Software Engineer at Stanford Division of Computational Medicine
Palo Alto, California, United States
Summary
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Rockstar🎓
Top SchoolJosef Hardi is a seasoned software engineer with 15 years of experience building and maintaining research-grade and production systems, currently contributing to computational medicine projects at Stanford and long-term work on Protégé and CEDAR to improve biomedical data interoperability. He blends a strong academic background in software engineering with hands-on open-source experience—having contributed backend fixes to the well-regarded Ontop Virtual Knowledge Graph project and authored a Java semantic-mapping library used in his startup. Josef specializes in integrating intelligent automation and LLM-driven workflows into existing tooling, with practical familiarity in agentic tools and best practices for applying AI to boost researcher productivity. Comfortable across backend systems, semantic web technologies, and data engineering, he also has a track record in open data advocacy and building pragmatic solutions for government and research domains.
15 years of coding experience
5 years of employment as a software developer
Master, Software Engineering, Master, Software Engineering at Free University of Bozen-BolzanoMaster, Software Engineering, Master, Software Engineering at Blekinge Institute of TechnologyBachelor, Computer Science, Bachelor, Computer Science at University of Indonesia
English, Indonesian, Italian
Stackoverflow
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Github Skills (7)
javas10
datalog10
java10
software-design8
logic-programming7
debugging7
debug7
Programming languages (10)
Github contributions (5)
ontop/ontop
Oct 2010 - Aug 2013
Ontop is a platform to query relational databases as Virtual RDF Knowledge Graphs using SPARQL
Role in this project:
Backend Developer
Backend DeveloperContributions:655 commits, 4 comments, 3 issues in 2 years 10 months
Contributions summary:Josef's contributions focused on modifying the code related to the `org.obda.query.domain` package by removing an unused interface. The user also improved the accessibility of the `arity` variable, modifying its access modifier from private to protected. Furthermore, the changes reveal an involvement in the Datalog grammar, including bug fixes for identifying variables within the body and modifications to related test cases.
knowledge-graphsemantic-webknowledge-graphsrelational-databasesrelational
metadatacenter/spreadsheet-validator-api
Mar 2023 - Dec 2024
The application programming interface (API) module of the IEC Spreadsheet Validator tool
Contributions:1 release, 50 pushes, 1 branch in 1 year 8 months
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