Go to Website
  • en
  • de

Stefan A.

Data Scientist

Frankfurt, Germany

Experience

Nov 2023 - May 2024
7 months

Data Scientist

Trendence Institute

  • Analyzing and visualizing survey data (big data).
  • Infrastructure and database performance optimization.
  • AWS, GCP, BigQuery, SQL, Tableau, Python, Tableau Server.
Sep 2020 - Apr 2021
8 months

Data Scientist

Trendence Institute

  • Analyzing and visualizing survey data (big data).
  • Infrastructure and database performance optimization.
  • AWS, GCP, BigQuery, SQL, Tableau, Python, Tableau Server.
Aug 2020 - Oct 2023
3 years 3 months

Data Engineer

ProSiebenSat1/SevenOneMedia

  • Project management.
  • Data warehouse and ETL development.
  • Data layer development.
  • KPI development and analysis.
  • Implementation of ML algorithms such as outlier detection, forecasting.
  • Ad targeting and consumer behavior environment.
  • Migration of full stack to infrastructure as code in AWS (S3, RDS, RedShift, Glue, Athena, Lambda, Kinesis, PySpark, TerraForm, CloudFormation, Travis CI, Git).
  • Visualization with Tableau and Python.
  • Tableau Server maintenance.
  • Data backup and recovery strategy.
Jun 2020 - Aug 2020
3 months

Project Manager / Data Scientist

Optiopay

  • Management of a focus KPI reporting project in banking / ecommerce environment.
  • Definition and visualization of data pipelines and KPIs.
  • Azure, SQL, PowerBI, Kafka, Python, Git.
Jun 2019 - Feb 2020
9 months

Data Engineer

ProSiebenSat1/SevenOneMedia

  • Project management.
  • Data warehouse and ETL development.
  • Data layer development.
  • KPI development and analysis.
  • Implementation of ML algorithms such as outlier detection, forecasting.
  • Ad targeting and consumer behavior environment.
  • Migration of full stack to infrastructure as code in AWS (S3, RDS, RedShift, Glue, Athena, Lambda, Kinesis, PySpark, TerraForm, CloudFormation, Travis CI, Git).
  • Visualization with Tableau and Python.
  • Tableau Server maintenance.
  • Data backup and recovery strategy.
May 2018 - Apr 2019
1 year

Project Manager / Data Analyst

MediaMarktSaturn

  • Management of migration of reporting project to Tableau environment.
  • Rebuilding DWH layers and whole reporting system including key reports.
  • Data analytics and machine learning algorithms such as RFM, outliers, customer lifecycle.
  • SPSS, SAS, Tableau, PowerBI, TeraData, SQL, PowerShell.
Nov 2017 - Mar 2018
5 months

Data Consultant

Barkawi Consulting

  • Project for Dräxlmaier Group (BMW Supplier).
  • Supply chain logistics.
  • Modelling and unification of hundreds of different data sources and formats.
  • Big data analysis, cleansing, dashboarding with Spark, SQL, Qlik, R.
May 2017 - Present
8 years 4 months

Side Projects

  • Web scraping, 3D modelling, Advent of Code, machine learning, generative AI.
  • Analysis of Twitter and Youtube data.
  • Investor consulting.
May 2017 - Present
8 years 4 months
Frankfurt, Germany

Data Scientist & BI Professional

Self-Employed

  • Data science and engineering in various projects for AI, Finance & Insurance Maths clients such as ProSiebenSat1, MediaMarktSaturn, Dräxlmaier (BMW Supplier), Trendence, Optiopay.
  • Project management.
  • Leading of small teams (up to 5).
  • Implementation of ML algorithms.
  • Optimization of cloud infrastructure.
  • Visualization of big data.
  • Budgets between 200K-2M.
May 2015 - May 2017
2 years 1 month

Sr. BI Manager, Team Lead BI

MyLorry FoodExpress / Just Eat Takeaway

  • Responsible for BI infrastructure of FoodExpress and implementation of driver/demand forecasting.
  • Identifying high potential delivery areas.
  • Machine learning & analytics.
  • Reporting, modelling, visualizing.
Dec 2010 - Aug 2013
2 years 9 months
Germany

Trainee & Business Analyst

Deutsche Bahn AG

  • Started as Trainee in ICT and later Manager for complex Software Development Projects.
  • Project management.
  • Leading of small teams (up to 5).
  • Budgets between 500K-2M.

Summary

Getting your data, transforming, analyzing, training it and finally gaining insights. I cover the whole pipeline:

  • Scraping
  • ETL (Extract, Transform, Load)
  • Machine Learning
  • Aggregation
  • Visualization

Including but not limited to:

  • Python, PySpark, R, Java, JavaScript, Scala, SQL
  • Tableau, PowerBI, Qlik, Leaflet, Shiny
  • AWS, Google Cloud, Azure
  • Docker, Git, Terraform, Travis

Languages

German
Native
English
Advanced
Spanish
Intermediate
French
Elementary

Education

Oct 2005 - Jun 2010

University of Technology, Berlin

Diploma · Business Mathematics · Berlin, Germany

Need a freelancer? Find your match in seconds.
Try FRATCH GPT
More actions

Similar Freelancers

Discover other experts with similar qualifications and experience

Stephan S.

Senior Data/ML Consultant & Technical Lead

View Profile
Philipp G.

Aufbau eines modernen Gehaltssystems

View Profile
Eduard V.

Tech Lead Customer Base Documentation Automation

View Profile
Mathew D.

Data Science Expert and AI Strategist

View Profile
Ursula M.

Data Scientist & AI Engineer & AI Architect

View Profile
Karl E.

Hiring Requirement

View Profile
Martin M.

Freelance Data Architect

View Profile
Felix B.

Machine status detection in industrial 3D printing based on infrared image data

View Profile
Raphael M.

Founder / Quant Developer

View Profile
Christian S.

Data-Science/Data-Engineering/AI-Engineering Expert

View Profile
Friedbert W.

Data Analyst / Business Analyst

View Profile
Johannes R.

Supervision of Adrian Bohnert’s Thesis; Blockchain and Smart Contracts

View Profile
Jens D.

Product Owner & Senior Data Scientist

View Profile
Frank W.

Freelance: Fullstack Software Developer

View Profile
Philipp B.

Research for Master's Thesis

View Profile
fratch Part of Bitkom logo
linkedIncrunchbaseyoutube
  • English
  • Deutsch

2025 © FRATCH.IO GmbH. All rights reserved.