Costo: Personal Budget Management App

- Configured React client-side protected routes bundled by Webpack
- Supports filtering and sorting expenses by keyword, date range, and amount
- Utilized Firebase with data validation for data streaming and user authentication
- Designed middleware and reducers with Redux to manage data flow and application states of the app

MOOCbase: a RDBMS Implementation

- Implemented a Java-based SQL Database Management System (DBMS) built upon file systems and indexed by B+ tree, with support for efficient join algorithms, query optimization, and database recovery
- Added multigranularity locking to the index system to support concurrent execution of transactions
- Handled 1,000,000 insertions in 1,253 s, outperforming MySQL (1,914 s) by 34% on Ubuntu 14.4 x64

ProjCity: Group Project Management Tool

- Developed an interactive React app with secured routing backed by a REST API in Java Spring Boot
- Implemented user authentication with Spring Security and JWT authentication tokens
- Persisted user data using Hibernate Object Relational Mapping (ORM) with MySQL connection
- Used Redux store and Thunk to manage the application state in React client

Campify: Camp Ground Review and Recommendation App

- Set up REST routes with Express and connected to a MongoDB instance with Mongoose - Utilized CSS aminations and Bootstrap 4 to improve the webpage UI - Implemented user authentication feature by Passport.js with local Mongoose strategy - Customized adaptive layouts with Scss to bundle all stylesheets and fit all screen sizes