Yan Holtz
Dataviz Consultant
Montpellier, Occitania, France
Summary
🤩
Rockstar🎓
Top SchoolYan Holtz is a data visualization consultant and software engineer with 11 years of experience building end-to-end analytics pipelines and interactive visualizations for research centers and tech companies, most recently at Datadog. He combines strong statistical and bioinformatics roots with front-end expertise in React and d3.js, and hands-on scripting in R and Python to turn complex datasets into clear, publication-ready visuals. Yan is also the creator of six widely used, award-winning educational dataviz sites (collectively drawing over a million monthly visits), including the popular Python, R and D3 Graph Galleries, demonstrating his knack for teaching through practical examples. Now focused full-time on tools and training, he consults, runs workshops, and speaks about dataviz best practices, with a proven track record of improving both design and reproducibility in visualization projects. An often-overlooked strength is his background in agricultural genomics and NGS analysis, which gives him deep experience translating domain-specific science into accessible visual narratives.
11 years of coding experience
12 years of employment as a software developer
L2 Biologie, L2 Biologie at Université Paul Sabatier Toulouse IIIMaster of Science (M.Sc.) Genetic Breeding and Statistic, Master of Science (M.Sc.) Genetic Breeding and Statistic at L'Institut Agro MontpellierL3 Mejoramiento genetico, L3 Mejoramiento genetico at Pontificia Universidad Católica de ChileLicence 1 Science de la vie, Licence 1 Science de la vie at Université Côte d'Azur
French, English, Spanish
Stackoverflow
73reputation
7kreached
1answer
3questions
Github Skills (26)
data-visualizations10
javascript10
jquery10
bootstrap10
python10
matplotlib10
css10
data-visualisation10
user-interface10
ui-design10
uid10
front-end-development10
html10
data-visualization10
bootstra10
Programming languages (10)
Github contributions (5)
holtzy/The-Python-Graph-Gallery
May 2017 - May 2022
A website displaying hundreds of charts made with Python
Role in this project:
Full-stack Developer
Full-stack DeveloperContributions:5 reviews, 371 commits, 309 PRs in 5 years 1 month
Contributions summary:Yan primarily worked on adding and modifying Python code to build charts. Their contributions included the initial creation of the repository, the addition of a header to the notebook, the inclusion of a "bad chart" example highlighting overplotting issues and solutions, and the addition of a new chart. The user demonstrated an understanding of data visualization best practices by incorporating examples that showcase common issues in charts and ways to avoid them.
chartspython
holtzy/data_to_viz
Feb 2018 - May 2022
Leading to the dataviz you need
Role in this project:Front-end Developer
Front-end DeveloperContributions:1 review, 321 commits, 30 PRs in 4 years 3 months
Contributions summary:Yan's commits primarily focused on implementing and adding UI components, and functionalities, as evident from changes to index.html and agency.css. These changes included the addition of a new image, the creation of a dynamic menu, the modification of the header, and the addition of modal elements, with improvements to tooltips.
javascriptreactdatavizneed
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