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Zbigniew Marczewski is a statistician and bioinformatician with extensive experience in data collection, survey sampling, and the development of R/Shiny applications. Since 2012, Zbigniew has worked at Centrum Badania Opinii Społecznej (CBOS) as a statistician, while also serving as a Senior Bioinformatician and R developer at 7N since 2017. Zbigniew completed degrees in applied quantitative methods in social sciences from Warsaw School of Economics and the University of Warsaw. They are actively engaged in designing data structures and ensuring data protection.