Carst Vaartjes
Co-founder, Chief Innovation Officer
Randstad, Netherlands
Summary
👤
Senior🎓
Top SchoolCarst Vaartjes is a data-driven product and innovation leader with over two decades of experience helping FMCG and retail organisations turn complex data into instant, actionable insights. As co-founder and Chief Innovation Officer of visualfabriq he defined the product vision and architecture for cloud-native, quick-to-deploy SaaS analytics that make business users more autonomous. Previously a senior manager at Deloitte, he led BI and analytics programmes across Europe and earned awards for pioneering projects in pricing, working capital, forecasting and trade promotion. He pairs strategic product expertise and formal program management certifications with hands-on engineering contributions—such as robustness and Unicode handling improvements to the open-source bcolz columnar data library—demonstrating attention to both user experience and reliable data infrastructure. Trained in business economics and certified at mastery level by TDWI, he blends commercial insight with technical rigor to bridge analytics, product and operations.
11 years of coding experience
16 years of employment as a software developer
Master of Arts Business Economics, Master of Arts Business Economics at Vrije Universiteit Amsterdam (VU Amsterdam)Grammar School, Grammar School at Johan van Oldebarnevelt Gymnasium
English, Dutch, Spanish
Github Skills (9)
python10
numpy9
fileio9
file-access9
file-handling9
file-processing9
data-structures8
data-structure8
performance-optimization8
Programming languages (3)
Github contributions (5)
Blosc/bcolz
Dec 2014 - Feb 2015
A columnar data container that can be compressed.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:5 commits, 4 PRs, 66 comments in 2 months
Contributions summary:Carst primarily focused on enhancing the functionality and robustness of the `bcolz` library, a columnar data container. Their contributions included implementing Unicode handling for column addressing, adding smart copying/moving features for disk-based ctable operations, ensuring data integrity by checking for root directory existence, and improving metadata management with auto-flushing capabilities. These changes suggest improvements to data handling, and overall reliability and usability of the library.
pythoncompressed-datadata-containercolumn-storecolumnar
visualfabriq/parqueryd
Jul 2020 - Apr 2022
A bQueryd compatible framework that uses parquet instead of bcolz
Contributions:1 review, 138 commits, 6 PRs in 1 year 8 months
parquet
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