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Backend roadmap.sh

This repository represents my journey through the backend roadmap projects from roadmap.sh/backend.
The projects are designed to help developers like myself build practical skills and create a strong portfolio while following industry best practices.

Projects

1. Task Tracker (CLI)

🔗 Project Page • 📁 Code Repo

A command-line interface application for managing tasks and to-do lists.

Tech Stack:

  • Java 8+
  • Gson (JSON serialization)
  • Maven

Architecture:

  • Layered Architecture (CLI, Service, Persistence)
  • Simple OOP with separation of concerns

Features:

  • File I/O operations
  • Command-line argument parsing
  • Basic data structures
  • CRUD operations

2. GitHub User Activity Tracker (CLI)

🔗 Project Page • 📁 Code Repo

A CLI tool that fetches and displays GitHub user activity using the GitHub API.

Tech Stack:

  • Java 11+
  • Java HttpClient (HTTP requests)
  • Gson (JSON parsing)
  • Maven

Architecture:

  • Layered Architecture (CLI, Service, Client, Model, Util)
  • Command Pattern for extensibility
  • Clean separation of concerns

Features:

  • API integration and HTTP requests
  • JSON data parsing
  • Error handling and validation
  • Command-line interface design

3. Expense Tracker (CLI)

🔗 Project Page • 📁 Code Repo

A modular Java CLI application for managing personal finances with JSON persistence.

Tech Stack:

  • Java 17+
  • Gson (JSON serialization)
  • Apache Commons CLI (argument parsing)
  • OpenCSV (CSV export)
  • Maven

Architecture:

  • Layered Architecture (CLI, Command, Service, Persistence, Model)
  • Command Pattern for CLI extensibility
  • Factory Pattern for command handlers
  • Validation Framework for input
  • Clean separation of concerns

Features:

  • Full CRUD operations for expenses (add, update, delete, list)
  • Summary reports (total and month-specific with category breakdown)
  • Filter expenses by category and month
  • Monthly budget management with overspend warnings
  • Export expense data to CSV files
  • Gson-based JSON storage and retrieval
  • Layered architecture with command pattern and comprehensive input validation

4. Number Guessing Game (CLI)

🔗 Project Page • 📁 Code Repo

A comprehensive Java CLI application implementing a number guessing game following hexagonal architecture principles.

Tech Stack:

  • Java 17+ (or higher)
  • Maven

Architecture:

  • Hexagonal Architecture (Ports & Adapters)
  • Layered (Domain, Application, Infrastructure, Main)
  • Dependency Injection throughout
  • SOLID principles and design patterns (Strategy, Factory, Repository)

Features:

  • Multiple difficulty levels (Easy, Medium, Hard)
  • Player management and score tracking
  • Real-time feedback and game state display
  • Input validation and error handling
  • Play again functionality
  • Professional CLI interface
  • Comprehensive JavaDoc documentation
  • Fully testable and extensible structure

5. Weather API Wrapper Service (API)

🔗 Project Page • 📁 Code Repo

A production-ready Spring Boot microservice that wraps the Visual Crossing Weather API, providing secure RESTful endpoints for weather data with comprehensive caching, rate limiting, and monitoring capabilities.

Tech Stack:

  • Java 21
  • Spring Boot 3.5.3
  • Spring WebFlux (reactive web client)
  • Redis (caching)
  • Bucket4j (rate limiting)
  • Jackson (JSON processing)
  • Maven

Architecture:

  • Hexagonal Architecture (Ports & Adapters)
  • Clean Architecture with layered separation
  • Domain-driven design principles
  • Dependency inversion and injection
  • SOLID principles throughout

Features:

  • RESTful API endpoints for weather data retrieval
  • Visual Crossing Weather API integration with error handling
  • Redis-based caching for improved performance and cost reduction
  • Bucket4j rate limiting with per-client token buckets
  • Comprehensive input validation and sanitization
  • Security hardening with OWASP compliance
  • Graceful shutdown and application lifecycle management
  • Structured logging and performance monitoring
  • Health checks and observability features
  • Cache and rate limit management endpoints
  • Production-ready configuration and deployment support

6. Unit Converter (Web Application)

🔗 Project Page • 📁 Code Repo • 🌐 Live Demo

A production-ready full-stack web application for converting between different units including length, weight, and temperature. Built with Node.js/Express backend and modern vanilla JavaScript frontend with responsive design.

Tech Stack:

  • Node.js 16+
  • Express 4.19.2
  • Vanilla JavaScript
  • Tailwind CSS
  • Jest (testing)
  • Vercel (deployment)

Architecture:

  • Layered Architecture (Presentation, Business, Data)
  • Repository Pattern for data access
  • Service Layer for business logic
  • Validation Chain with sanitization
  • Error Hierarchy with structured exception handling

Features:

  • RESTful API endpoints for all conversion types
  • Responsive web interface with mobile support
  • Accurate conversions using standard mathematical formulas
  • Cross-unit support between metric and imperial systems
  • Comprehensive input validation and error handling
  • Express static file serving for frontend assets
  • 500+ test cases including unit, integration, and E2E tests
  • Vercel serverless deployment configuration
  • Complete UML diagrams and professional documentation