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dmortalla/README.md

👋 Hi, I'm Darrell Mortalla

Data Analyst | Python · SQL · Excel · Power BI · Tableau · Cloud

I’m a data analyst specializing in using AI to build end-to-end analytics workflows — from cleaning and modeling data to deploying multi-cloud dashboards and automated business-intelligence pipelines.

🧩 Featured Projects

# Project Description Tools
1 Data Cleaning & Preparation Retail Sales dashboard with AWS deployment — end-to-end data wrangling workflow with validation scripts. Python · Pandas · AWS
2 Exploratory Data Analysis (EDA) Customer Churn tracker deployed on Azure — statistical profiling and churn behavior analysis. Python · Matplotlib · Azure
3 Excel Automation Dashboard COVID-19 trend analysis with GCP integration — automated Excel reports powered by Python scripting. Python · Excel · GCP
4 Power BI Retail Insights Marketing Campaign ROI analytics — cross-channel marketing performance with Power BI dashboards. Power BI · SQL
5 Tableau Global Sales Overview E-commerce order automation using Python + Excel — visual storytelling with Tableau and automated ETL. Tableau · Python
6 SQL Sales Optimization Financial KPI tracking via SQL + Power BI — optimized queries for pricing and profitability insights. SQL · Power BI
7 Predictive Modeling Customer segmentation & RFM analysis with Tableau — machine-learning-based forecasting and insights. Python · Tableau
8 Customer Segmentation Supply Chain efficiency modeling with Power BI — advanced segmentation and dashboard optimization. Power BI · SQL
9 A/B Testing & Statistical Analysis Marketing campaign inference modeling — statistical testing to identify significant strategies. Python · Statsmodels
10 Sales Forecasting Time-series prediction using Python + Power BI — ARIMA and Prophet models for trend forecasting. Python · Power BI
11 BI Data Modeling Dimensional warehouse schema (SQL + Power BI) — data modeling and ETL processes for BI systems. SQL · Power BI
12 Executive Insights Dashboard Storytelling dashboard for business leaders — executive-level insights visualized in Power BI. Power BI
13 Cloud Data Pipeline Capstone End-to-end analytics pipeline on AWS + Power BI — full-stack ETL, storage, and BI pipeline. Python · AWS · Power BI

🛠️ Tools & Technologies

Python SQL Excel Power BI Tableau AWS Azure GCP

📫 Connect With Me

“Data transforms decisions into measurable success.”
© 2025 Darrell Mortalla

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  1. urban-mobility-data-lakehouse urban-mobility-data-lakehouse Public

    Production-style medallion lakehouse pipeline for NYC taxi data built with Python, Pandas, Parquet storage, and DuckDB for analytics, demonstrating modular ETL design and reproducible data engineer…

    Python

  2. dog-breed-chatbot dog-breed-chatbot Public

    AI-powered dog breed recommender with Streamlit.

    Python

  3. mlai-portfolio mlai-portfolio Public

    Machine Learning & AI Engineering Portfolio — Interactive Apps, RAG, Deep Learning, Recommenders, Forecasting, and Anomaly Detection.

    Python

  4. transformer-from-scratch-pytorch transformer-from-scratch-pytorch Public

    A clean, educational PyTorch Transformer encoder implementation built from first principles.

    Python