Freelancer profile translated to English.
Back to original languageAbout Markus
Data Generalist - With my skills, I cover a spectrum that makes me independent of Data Engineers and Data Scientists to a certain extent. ETL/ELT, creating simple pipelines, model development (e.g., time series), forecasting, etc., are among these skills.
In terms of content, throughout my career, I have primarily worked with data from various (online) marketing channels. This includes platforms like Facebook/Instagram, Google Ads, Mailchimp, Salesforce Marketing Cloud, and various shop systems.
Often, the goal of my projects was the conception and implementation of, for example, multichannel (marketing) dashboards. In the conception phase, I critically consider which KPIs are relevant and how they can be calculated. In the implementation phase, my skills cover many areas, from data connection and data preparation to visualization.
I look forward to exciting projects and productive collaboration!
German
Native or bilingual
English
Native or bilingual
Dutch
Fluent
Remote only
Primarily works remotely
Experience
- GEMAData EngineerFILM AND AVAugust 2024 - October 2025 (1 year and 2 months)Berlin, GermanyDeveloped and optimized a data model representing complex dependencies between creators and publishers for Elasticsearch usage. Set up multi-stage ETL pipelines (following Databricks' Bronze-Silver-Gold layer model) in Databricks (using Pyspark & SQL). Made calculated data available daily and wrote it to an Elasticsearch instance.Introduced unit and regression tests (poetry, pytest & Github Actions) for the output dataset.
- The quality groupMarketing data analystE-COMMERCEAugust 2023 - April 2024 (8 months)Hamburg, GermanyDeveloped a marketing intelligence reporting system and enhanced it based on changing requirements (new data sources, stakeholder requests). Developed several dashboards (Tableau) providing insights into the company's marketing activities for relevant channels.The project primarily consisted of the following components:- Connecting raw data (airbyte, supermetrics, fivetran)- Normalizing and cleaning data in the DWH (databricks, SQL/Python)- Developing classification functions to map different content logics and attribution models.- Coordination with various stakeholders
- OBI Corporate Center GmbHData AnalystRETAIL (SMALL BUSINESS)April 2023 - June 2023 (2 months)Kreisfreie Stadt Köln, GermanyDevelopment of a sales/valuation model.Based on various assumptions, a model was developed that could provide a recommendation on how to handle items requiring review. Various cost factors (e.g., storage costs, logistics costs, etc.) were compared against simulated revenues. Different scenarios were determined to support management decision-making.
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Education
- Bachelor of Science Applied GeographyRWTH Aachen University2014Bachelorarbeit: Online Strategien stationärer Einzelhändler
- Master of Science Economics & GeographyRWTH Aachen University2018Masterarbeit: Das Wachstum eines Online Pure-Players: Eine Zeitreihenanalyse