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git-o3/README.md

Hi there 👋

I'm Chris Greg Backend Developer — Node.js · Express · MongoDB

I build secure, production-ready REST APIs and backend systems for web and mobile applications. My focus is clean architecture, structured data design, and shipping backends that work reliably in the real world.

What I do

I design and build backend systems from the ground up — authentication, role-based access, multi-tenant architecture, microservices, database design, business logic, and API documentation. I write clean, maintainable code, monitor system health, and deliver projects with proper READMEs so teams can integrate immediately.

Featured Projects

Ecommerce API — Full ecommerce backend with JWT auth, role-based access (admin/staff/customer), atomic order placement using MongoDB transactions, guest cart syncing, product search and filtering, and soft delete.

Workout Tracker API — Secure REST API with custom exercise management, workout scheduling, progress analytics, and interactive Swagger UI documentation.

Expense API — Expense tracker with JWT auth, category filtering, and flexible date range queries.

Stack

Node.js Express MongoDB Mongoose JWT Swagger RabbitMQ Docker EJS REST APIs Redis Nginx Linux

Pinned Loading

  1. movie-reservation-system movie-reservation-system Public

    Movie Reservation System — A full-featured backend service for booking movie tickets. Users can register and authenticate, browse available films and showtimes, reserve specific seats, and manage t…

    JavaScript

  2. real-time-leaderboard real-time-leaderboard Public

    Real-time Leaderboard System — A modular monolith REST API for managing competitive game rankings with real-time WebSocket updates, Redis sorted sets for leaderboard management, and JWT authenticat…

    JavaScript

  3. ecommerce-api ecommerce-api Public

    A RESTful ecommerce backend built with **Node.js**, **Express**, and **MongoDB**. Features JWT-based authentication, role-based access control, atomic inventory management, and guest cart syncing.

    JavaScript

  4. expense-api expense-api Public

    A RESTful expense tracker API with JWT authentication, full CRUD for expenses, category filtering, and flexible date range queries including past week, month, 3 months, and custom date ranges.

    JavaScript

  5. workout-tracker-api workout-tracker-api Public

    A secure RESTful API backend for logging workouts, tracking custom exercises, and compiling progress analytics.

    JavaScript

  6. Guessing-Game Guessing-Game Public

    A fun interactive number guessing game that runs in your terminal. Pick a difficulty, guess the secret number, and see how few attempts it takes you to win.

    JavaScript