All Projects
A collection of my work, ranging from experimental tools to full-scale production applications.
Slipify
A React Native app I built because I was tired of making rent receipts by hand in Word. Generates professional PDF receipts and tracks tenant payment history.
- Built with Expo to ship fast without managing native iOS build chains
- react-native-html-to-pdf for consistent receipt formatting across devices
- Offline-first - all data stored locally, no backend needed for the core flow
- Approved on the App Store, used monthly for my own properties
Roamly
An AI travel planner that builds day-by-day itineraries from a simple prompt. Frontend in React and Tailwind, with the OpenAI API driving the planning.
- Structured prompts force JSON output from GPT-4, parsed into a day-by-day UI component
- Client-side caching with localStorage so a refresh doesn't lose your itinerary
- Mobile-first layout, since most trip planning happens on a phone
Data Science Case Studies
In-depth analyses and machine learning projects showcasing data-driven insights and predictive modeling.
CO2 Emissions
Comprehensive analysis of global CO2 emissions patterns, trends, and predictive modeling to understand environmental impact and future projections.
Students' Performance in Exams
Statistical analysis examining factors affecting student performance, including demographic variables, study habits, and educational interventions.
House Prices - Advanced Regression Techniques
Advanced regression modeling to predict house prices using feature engineering, ensemble methods, and comprehensive data preprocessing techniques.
© 2026 Josai Kinzunga. All rights reserved.