ETL/ELT, Data Warehousing, Data Lake, Star Schema, Apache Spark, PySpark, Apache Kafka, Apache Airflow, dbt, Hadoop, Java (Spring Boot), Python (FastAPI, Flask), REST API, Microservices, Security, React, PostgreSQL, MySQL, MongoDB, Redis, MLflow, XGBoost, SHAP, Scikit-learn, Pandas, NumPy, Docker, Docker Compose, CI/CD, Azure DevOps, Git, GitHub, Linux, Liquibase, Postman