Lir Chen

Additional Screenshots

Project Overview

This project demonstrates a production-ready AWS infrastructure with complete CI/CD pipeline, comprehensive monitoring, and GitOps deployment strategy. Built with infrastructure-as-code principles using Terraform and deployed to AWS EKS cluster.

Key Features

• Production-Ready AWS Infrastructure: Complete EKS cluster with PostgreSQL RDS and ElastiCache Redis
• Multi-Worker Node Setup: Proper resource allocation with auto-scaling capabilities
• GitOps Deployment: ArgoCD for automated sync, rollback, and deployment management
• Comprehensive Monitoring: Real-time cluster metrics with Grafana dashboards and Prometheus
• Status Page Integration: Public status monitoring for all infrastructure components
• Security & Networking: VPC with public/private subnets, NAT Gateway, Application Load Balancer, and Network Load Balancer
• Infrastructure as Code: Complete Terraform modules for reproducible deployments
• Helm Charts: Kubernetes package management for easy deployment

Technologies Used

• AWS (EKS, EC2, RDS, ElastiCache, VPC, S3, ECR, Secrets Manager, Load Balancers)
• Terraform for infrastructure provisioning
• Kubernetes with Helm for container orchestration
• ArgoCD for GitOps deployment
• Prometheus & Grafana for monitoring and alerting
• Docker for containerization
• GitHub Actions for CI/CD

Technical Achievements

• Designed and implemented secure VPC architecture with proper subnet isolation
• Configured auto-scaling for optimal resource utilization
• Set up comprehensive monitoring with custom Grafana dashboards
• Implemented GitOps workflow for version-controlled infrastructure changes
• Created reusable Terraform modules for infrastructure components

Project Overview

FlavorWorld is a full-stack social networking application built for recipe enthusiasts. Features include real-time messaging, group functionality, social interactions, and a comprehensive recipe management system. Built with React Native for mobile and React for web platforms.

Video Demo

Key Features

• React Native Mobile App: Cross-platform mobile application with native performance
• Microservices Backend: API Gateway with specialized services (Auth, User, Recipe, Group, Chat)
• Real-time Communication: Socket.IO integration for instant messaging and typing indicators
• Social Features: Follow system, groups, likes, comments, and push notifications
• Recipe Management: Create, share, and discover recipes with photo uploads
• Group Chat: Create cooking groups with real-time messaging
• User Authentication: Secure JWT-based authentication with email verification
• File Upload: Multi-image upload for recipe photos

Technologies Used

• React Native & Expo for mobile development
• React for web interface
• Node.js & Express for backend APIs
• Socket.IO for real-time features
• MongoDB for database with optimized schemas
• JWT for authentication
• Multer for file uploads
• Push notifications integration

Technical Achievements

• Implemented microservices architecture with API gateway pattern
• Built real-time chat with Socket.IO including typing indicators and online status
• Designed scalable MongoDB schemas for social networking features
• Created responsive UI components for both mobile and web platforms
• Integrated push notifications for user engagement

Project Overview

FitFlow is a full-stack fitness tracking platform that helps users monitor their nutrition, workouts, progress photos, and fitness goals with advanced analytics and an AI-powered coach. Built with modern web technologies and containerized with Docker for seamless deployment.

Core Features

• Dashboard Overview: Real-time fitness summary with key metrics including weekly workouts, daily calories, current weight & BMI, and active streak
• Workout Tracking: Log exercises with duration, difficulty levels, and comprehensive workout history with date filtering (Today/Week/Month/Year)
• Nutrition Tracker: Track daily meals by type (Breakfast, Lunch, Dinner, Snack) with complete macronutrient breakdown (protein, carbs, fats) and visual charts
• Progress Gallery: Upload and visualize transformation photos over time to track your fitness journey
• Goals Management: Set measurable fitness milestones with visual progress bars and celebrate achievements
• Analytics & Stats: 4 interactive charts showing workout frequency, calorie intake trends, macros breakdown, and duration patterns
• BMR/TDEE Calculator: Calculate daily calorie needs based on personal metrics with calculation history
• Nutrition Trivia: Interactive quiz game to test and improve your nutrition knowledge
• AI Fitness Coach: Get personalized fitness and nutrition advice 24/7 powered by Mistral AI
• Profile Management: Complete user profile with the ability to update personal info, fitness goals, and change password securely

Screenshots Gallery

Tech Stack

• Frontend: React 18 with Vite, Recharts for data visualization, Lucide React icons, Modern CSS3 with glassmorphism design
• Backend: Node.js with Express.js, MongoDB with Mongoose ODM, JWT authentication, Bcrypt password hashing, Mistral AI integration
• DevOps: Docker & Docker Compose, Nginx reverse proxy, Multi-stage builds for optimization
• Testing: Jest & Supertest with 90+ comprehensive tests covering all API endpoints
• File Handling: Multer for progress photo uploads with persistent storage

Technical Achievements

• Comprehensive Testing: 90 tests across 10 test suites covering authentication, CRUD operations, analytics, edge cases, and error handling
• RESTful API Architecture: Well-structured API with 11 dedicated controllers for different features
• AI Integration: Mistral AI-powered coach providing personalized fitness advice with natural language processing
• Advanced Analytics: Real-time data visualization with filtering by Today/Week/Month/Year across all tracking features
• Docker Containerization: Complete Docker Compose setup with health checks, volume persistence, and optimized multi-stage builds
• Security: JWT-based authentication, bcrypt password hashing, secure password requirements (8+ chars, uppercase, lowercase, number, special char)
• Responsive Design: Mobile-first approach ensuring perfect functionality on all device sizes
• User Experience: Intuitive interface with modal-based editing, real-time feedback, and smooth animations

API Endpoints

Complete RESTful API with endpoints for:

• Authentication (register, login)
• User management (profile, stats, password change)
• Workouts (CRUD with period filtering)
• Nutrition tracking (meals CRUD with date filtering)
• Goals management (CRUD with progress tracking)
• Analytics (workout stats, nutrition stats, dashboard overview)
• Progress photos (upload, retrieve, delete)
• Trivia game (questions, answers, statistics)
• Calculator (BMR/TDEE calculation with history)

Project Overview

An enterprise-grade authentication system demonstrating microservices architecture with event-driven design. Features distributed database with change data capture and real-time activity logging through Kafka.

Key Features

• Microservices Architecture: React frontend, Node.js API, and Kafka consumer services
• Distributed Database: TiDB for scalable, MySQL-compatible distributed SQL
• Change Data Capture: TiCDC for real-time database change streaming
• Event-Driven Processing: Kafka for asynchronous activity logging and processing
• Containerized Deployment: Complete Docker Compose orchestration
• Advanced Monitoring: Custom logging and database change tracking
• User Management Dashboard: Real-time profile information and system analytics
• Secure Authentication: JWT-based auth with modern login interface

Technologies Used

• React for frontend dashboard
• Node.js & Express for API services
• TiDB distributed SQL database
• TiCDC for change data capture
• Apache Kafka for event streaming
• Docker & Docker Compose for containerization
• log4js for structured logging

Technical Achievements

• Implemented microservices architecture with event-driven design
• Integrated TiDB with TiCDC for real-time change data capture
• Built Kafka consumer for processing authentication events
• Created Docker Compose setup for complete local development environment
• Designed user management dashboard with real-time analytics

Project Overview

A comprehensive AWS resource management tool featuring both CLI and GUI interfaces. Built with boto3 for programmatic AWS access, managing EC2 instances, S3 buckets, and Route53 DNS records with enforced IAM policies.

Key Features

• Python CLI: Command-line interface for AWS resource provisioning
• GUI Application: User-friendly graphical interface for simplified management
• Multi-Service Support: Manage EC2, S3, and Route53 resources
• IAM Policy Enforcement: Automated security policies and permissions
• Automated Tagging: Convention-based resource tagging for organization
• Cost Optimization: Features for monitoring and reducing AWS costs
• Resource Monitoring: Track resource usage and status
• Batch Operations: Perform actions on multiple resources simultaneously

Technologies Used

• Python for core application logic
• Boto3 for AWS SDK integration
• Tkinter for GUI development
• AWS Services: EC2, S3, Route53, IAM
• argparse for CLI argument parsing

Technical Achievements

• Developed dual interface (CLI and GUI) for different user preferences
• Implemented automated IAM policy application for security compliance
• Created resource tagging system for better organization
• Built error handling and validation for AWS operations
• Designed intuitive GUI with Tkinter for non-technical users

Project Overview

A comprehensive expense management system with a professional RESTful API backend. Features include CRUD operations, monthly reporting, automated testing, and production deployment with health monitoring.

Video Demo

Key Features

• RESTful API: Complete CRUD operations following REST principles
• MongoDB Atlas Integration: Cloud database with Mongoose ODM and optimized schemas
• Computed Pattern: Cached monthly reports for improved performance
• Professional Logging: Pino logger for structured logging
• Comprehensive Testing: Jest test suite with Supertest for API testing
• Production Deployment: Hosted on Render with health check endpoints
• API Documentation: Complete API documentation with examples
• Error Handling: Robust error handling with meaningful error messages

Technologies Used

• Node.js & Express.js for API development
• MongoDB Atlas for cloud database
• Mongoose for data modeling
• Jest & Supertest for testing
• Pino for logging
• Render for deployment

Technical Achievements

• Implemented computed pattern for optimized monthly report generation
• Created comprehensive test coverage with Jest
• Designed RESTful API following industry best practices
• Deployed to production with continuous health monitoring
• Structured logging for debugging and monitoring