Konstantinos Bitos

bitoskostas1@gmail.com | (+30) 6978401468

Thessaloniki, Greece

LinkedIn | GitHub

Work Experience

Data Analyst

July 2022 - March 2024
Margera | Remote
  • Analyzed data collected from various data sources, identified new data sources or ways to look at the data and performed the synthesis of insights to generate coherent stories.
  • Used data-driven decision making to help redesign the customer acquisition strategy, increasing revenue by 20%.
  • Designed and created dashboards for periodic or ad-hoc needs; dashboards used by more than 25 executives.
  • Partnered with clients to translate business requirements into tangible deliverables.

Projects

Customer Profiling - SQL and Python

  • Analyzed treadmill sales data to profile customers by product type.
  • Calculated averages, distributions, and two-way contingency tables for categorical variables and visualized numeric data with bar charts, boxplots, and histograms.
  • Derived actionable marketing insights.
GitHub: Customer Profiling

Serverless ETL Pipeline - Google Cloud

  • Built a serverless ETL pipeline for processing and storing structured data in the cloud.
  • Automated data ingestion, transformation, and storage using Python scripts triggered by cloud events.
  • Ensured scalable and maintainable architecture suitable for real-time or batch processing.
GitHub: Serverless ETL Pipeline

Bank Customer Churn Prediction - Machine Learning

  • Built a predictive model to identify bank customers likely to leave using demographic and financial data.
  • Performed feature engineering, trained and compared Random Forest and Gradient Boosting models; addressed class imbalance and optimized probability thresholds.
  • Evaluated models using ROC-AUC, F1-score, and feature importance visualization.
GitHub: Bank Customer Churn Prediction

Education

Electrical and Computer Engineering

Graduation: December, 2025
Aristotle University of Thessaloniki | Thessaloniki, Greece
  • Specialized in telecommunications.
  • Published Master's thesis titled: "Natural and Artificial Nuclides in Wood Pellets and Derived Ashes".

Certifications, Skills & Interests

Skills: Python (Pandas, Numpy, Scikit-learn), SQL, Machine Learning, PowerBI, LookerStudio, Google Analytics, Excel
Certifications: Microsoft: PowerBI Data Analyst Associate, Google: LookerStudio, Google: Analytics UA, Google: Analytics GA4, Google: Tag Manager
Interests: Chess, Movies, Electronics, Tabletop games