Sergej Walter

I help businesses turn scattered data into clear insights and practical tools. As a data scientist, I work end-to-end: from understanding your problem and cleaning your data, to building models, visualizations, and simple interfaces you can actually use.

What I do:

● Data cleaning, preprocessing, and exploratory data analysis (EDA)

● Predictive modeling (regression, classification, time series)

● Clustering, segmentation, and anomaly detection

● Experiment design & A/B testing

● Dashboards, reports, and decision-support tools

Tech stack:

● Python (pandas, NumPy, SciPy, scikit-learn, Jupyter)

● SQL and data querying

● Visualization (Matplotlib, Plotly)

● Excel-based analytics and reporting

How I work:

✅ Clear communication and regular updates

✅ Reproducible code and well-documented notebooks

✅ Focus on business value, not just model accuracy

If you have data and a question you’d like answered—whether it’s improving a process, understanding your customers, or testing a new idea—I can help you turn that into a concrete, data-driven solution.

Contact me to discuss your project!