MJ Barrera

Software Developer Portfolio

Hi, I'm MJ — a software developer working across Python, Flutter/Dart, and React. After 22 years in auto retail (the last 4 as a Product Manager building eCommerce tools) and a year consulting on web development & SEO, I made the leap to writing code full-time. I'm currently a digital nomad based in Southeast Asia, shipping real applications and building a B2B SEO platform (Python backend, React frontend). Everything below is real, shipped work. Take a look, or find me on Github & LinkedIn using the links below.

12 minute read

Compressing Feature Space For Classification Using PCA

In this project we use Principal Component Analysis (PCA) to compress 100 unlabelled, sparse features into a more manageable number ...

14 minute read

Customer Segmentation Machine Learning Clustering Python

The "You Are What You Eat" Customer Segmentation

In this project we use k-means clustering to segment up the customer base in order to increase business understanding, and to enhanc...

54 minute read

Customer Targeting Machine Learning Classification Python

Enhancing Targeting Accuracy Using ML

Our client, a grocery retailer, wants to utilise Machine Learning to reduce mailing costs, and improve ROI! Table of contents 0...

13 minute read

AB Testing Hypothesis Testing Chi-Square Python

Assessing Campaign Performance Using Chi-Square Test For Independence

In this project we apply Chi-Square Test For Independence (a Hypothesis Test) to assess the performance of two types of mailers that...

36 minute read

Customer Loyalty Machine Learning Regression Python

Predicting Customer Loyalty Using ML

Our client, a grocery retailer, hired a market research consultancy to append market level customer loyalty information to the datab...

Previous projects