Event-driven architecture, kafka, airflow
ATTILA JÁNKFALVI
Data Engineer/Scientist
Budapest,BU
Summary
Results-focused data professional equipped for impactful contributions. Expertise in designing, building, and optimizing complex data pipelines and ETL processes. Strong in SQL, Python, Power BI, ensuring seamless data integration and robust data solutions. Known for excelling in collaborative environments, adapting swiftly to evolving needs, and driving team success.
Overview
10
10
years of professional experience
1
1
Language
Work History
Data Engineer | Data Architect
Hungarian Central Statistical Office
01.2021 - 01.2024
- I designed and operated a Python-based batch ETL pipeline between Oracle source and target systems, using control tables, idempotent loading. Managed the full data lifecycle from data collection, cleaning, and database optimization to model training and on-premise deployment. Focused on GDPR compliance, high-level data security, and clear, actionable visualizations.
- Engineering – Design and build ETL pipelines using Python to integrate diverse governmental datasets. High volume data migration.
- Leadership – Led a data team of 3 members, coordinated workflows, and ensured data quality.
- Model developing – Simulate the household behavior with Markov chains; applied different clustering and time series forecasting (ARIMA, SARIMA) to socioeconomic indicators.
- Python (pandas, numpy, scikit-learn, statsmodels, tensorflow, keras, jupyter, DataBricks, Spark), Oracle SQL, Power BI, Linux, Windows, Git
Independent Data Scientist
Self-Employed
01.2019 - 01.2021
- Used Car Market Analysis & Price Prediction:
- Build a daily web scraping pipeline (Python + BeautifulSoup), performed feature engineering and regression modeling to estimate vehicle prices. Deployed automated SQL updates and live Power BI dashboard.(Linux, Bash, Python, Power BI)
- Behavior Segmentation for a Wellness Studio:
- Clean and restructure MySQL booking data to detect churn risk, identify high-value customers, and model for user funnel behavior. Delivered interactive Power BI reports for business decisions.
Healthcare Data Analyst
Spicy Analitics ltd.
01.2019 - 01.2020
- Analyzed large-scale healthcare datasets (500GB+) to uncover relationships between neurological psychiatric conditions. Deliver insights for medical researchers and pharmaceutical industry stakeholders.
- Data Management – Managed complex, multi-source datasets from national healthcare records.
- Processing – data cleaning/feature engineering, transformation, and harmonization for advanced analysis. EDA to identify trends, anomalies, and correlations.
- Insight – Data-driven insights to support research and strategic planning. Visualisation with Power BI.
- Collaboration – Collaborated with academic and industry stakeholders.
Geophysical Data Analyst & GIS Project Lead
Hungarian Geophysical Institute
01.2014 - 01.2018
- Led a national-scale geospatial data project to register abandoned mining sites and assess geohazard risks.
- Developed GIS-based spatial database and designed risk scoring system for surface movement threats.- Processed seismic, geo-electric and GPR signal data, using domain-specific tools
Education
Udemy
Earth Science Engineer - Geophysics specialization
University of Miskolc
01.2010
Skills
Python (pandas, NumPy, scikit-learn, beautifulsoup, statmodel, tensorflow, networkx, hdbscan, oracledb, geopandas, table-baseline3)
Interests
Reinforcement learning
Timeline
Data Engineer | Data Architect
Hungarian Central Statistical Office
01.2021 - 01.2024
Independent Data Scientist
Self-Employed
01.2019 - 01.2021
Healthcare Data Analyst
Spicy Analitics ltd.
01.2019 - 01.2020
Geophysical Data Analyst & GIS Project Lead
Hungarian Geophysical Institute
01.2014 - 01.2018
Earth Science Engineer - Geophysics specialization
University of Miskolc
Udemy