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DelphinKdl/README.md

Delphin K.

Fraud & Risk Data Scientist | Analytics Engineer

Fraud Detection • Risk Modeling • Data Engineering


The Philosophy

I build fraud and risk systems that protect revenue, reduce losses, and support confident financial decisions.

My work sits at the intersection of machine learning, risk analytics, and data engineering.
I design end‑to‑end systems from SQL pipelines and Airflow orchestration to CatBoost fraud models deployed on AWS with a focus on reliability, explainability, and real‑world impact.


The Integrated Toolkit

Fraud & Risk Analytics Machine Learning & Modeling Data & Analytics Engineering
Fraud Detection Risk Scoring Anomaly Detection CatBoost XGBoost Scikit-Learn Airflow (DAGs) ETL/ELT dbt
Credit Risk (PD/LGD/EAD) Optuna SHAP Imbalanced Learning AWS (EC2/S3/Lambda) Snowflake
Portfolio Insights Pandas NumPy Docker Git FastAPI

Core Expertise

  • Fraud Detection Systems: Real‑time scoring engines with high‑precision CatBoost models and engineered behavioral features.
  • Risk Modeling: Credit risk segmentation, anomaly detection, and model governance aligned with financial controls.
  • Data Engineering: Scalable pipelines using Airflow, dbt, and Snowflake, with automated validation and monitoring.
  • Model Deployment: FastAPI microservices, Dockerized inference, and MLflow experiment tracking.
  • Analytics Strategy: Turning complex risk signals into clear, executive‑ready insights that support financial decisions.

Featured Impact Systems

  • 🛡️ Fraud Detection Engine: Real‑time predictive system achieving 0.93 precision on high‑risk segments with explainable outputs.
  • 📉 Credit & Portfolio Risk Analytics: Scorecard‑driven segmentation and PD modeling for financial decisioning.
  • 🚲 Demand Forecasting: Cloud‑deployed forecasting API with 51% MAE reduction using TimeSeriesSplit and automated retraining.
  • 🔁 Churn & Retention Modeling: Identified high‑value at‑risk customers with 0.64 precision, supporting ARR protection strategies.


Let's Connect

Open to Fraud Analytics, Risk Modeling, and Data Engineering roles - Washington, DC

Visit datawithdelphin.com

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  1. Fraud-Detection Fraud-Detection Public

    A Machine Learning Application that identifies fraudulent transactions for financial institutions, enabling real-time intervention and minimizing financial losses.

    Jupyter Notebook 1

  2. metro-transit-etl-pipeline metro-transit-etl-pipeline Public

    End-to-end, production-grade data engineering project using Apache Airflow, Docker, and PostgreSQL to process real-time transit data. Implements a Medallion Architecture (Bronze → Silver → Gold) wi…

    Python

  3. Demand-Forecasting Demand-Forecasting Public

    A Machine Learning Application that forecasts hour-ahead bike rental demand across an entire city, enabling dynamic pricing optimization and revenue maximization.

    Jupyter Notebook 3

  4. Vodafone-customer-churn-ML-prediction Vodafone-customer-churn-ML-prediction Public

    A Machine Learning Application that predicts customer churn for companies, enabling proactive retention strategies and reducing revenue loss.

    Jupyter Notebook 1