J. Lopez Castillo

Building Data Infrastructure That Powers Business Intelligence

I’m Javi, a data engineering leader focused on building scalable data infrastructure, clean architecture, and machine learning–ready systems.

7+ years building data systems that drive real-time decisions

Skills & Expertise

Data Engineering

Languages

Python
SQL
Terraform

Platforms

Snowflake
PostgreSQL

Tools

Airflow
dbt
Docker
Git
AWS

Data Analysis

Methods

A/B Testing
Exploratory Analysis
Hypothesis Testing

Tools

Jupyter Notebook
Tableau

Techniques

Classification
Forecasting
Regression
Segmentation

Machine Learning

Libraries

Scikit-learn
Pandas
Numpy
TensorFlow

Techniques

Feature Engineering
Model Evaluation
PCA
KNN

Certifications

Recent Projects

Multiple Linear Regression on Citi Bike Ridership

Built a predictive model for NYC bike usage based on environmental and behavioral trends. This project highlights my approach to data exploration, model building, and actionable storytelling.