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Karol Marusza has a diverse work experience spanning across various industries. Karol is currently working as a Data Engineer at Objectivity since April 2021. Prior to that, they co-founded wemadeitok in December 2020. In 2020, they worked as a Business Intelligence Developer at Nordea from July to December. From 2018 to 2020, they were an ETL Developer at JCommerce Sp. z o.o. and a BI Developer at Software Mind. Karol also worked as a Business Intelligence Consultant at Roche from June 2018 to December 2019. In their earlier career, they served as a Data Analyst and a Project Manager at nazwa.pl, an Advertising Sales Consultant at Grupa Onet-RAS Polska, a Sales Consultant at LOCKUS, Grupa Kapitałowa Unima 2000 S.A., and a Retail Sales Consultant at PLAY. Karol Marusza's roles have involved responsibilities such as data analysis, ETL development, business support, CRM solutions, and sales consulting.

Karol Marusza began their education in 2010 and graduated in 2012 from AGH University of Krakow with an Engineer's degree in Materials Engineering. Following that, they attended Wyższa Szkoła Ekonomii i Informatyki w Krakowie from 2014 to 2018, where they obtained an Engineer's degree in Computer Science.

In addition to their formal education, Karol Marusza has acquired several certifications. In 2017, they obtained certifications in SQL Fundamentals from SoloLearn and PHP Tutorial from SoloLearn. In 2018, they obtained certifications in Intro to Python for Data Science, SQL for Data Science, Joining Data in PostgreSQL, and Intermediate Python for Data Science from DataCamp, as well as Level B2 in English from busuu. In 2019, they obtained certifications in Deep Learning Challenge and Practical Machine Learning from DataWorkshop, and Applying SQL to Real-World Problems and Database Design from DataCamp.