Marta Jereczek is a Data Science Manager in Product Insights at Spotify, where they currently lead data-driven initiatives. Previously, they held roles at Zalando SE, including Product Analytics Team Lead and Senior Product Analyst, focusing on product performance and analytics. Marta also worked as a Web Analyst at Value Media and Conversion, where they specialized in multi-channel campaign effectiveness and conversion rate optimization. Their extensive experience includes rigorous A/B testing, data pipeline development, and advanced analysis techniques using SQL, Python, and R.
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