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Oper-Kassa β€” Currency Exchange Website

πŸ“‹ Project Overview

Oper-Kassa is a modern currency exchange website with 24/7 service in Moscow. The platform provides real-time exchange rates, online calculator, and service location information.

πŸš€ Key Features

Core Functionality

  • Real-time currency rates with multiple data sources
  • Interactive exchange calculator with instant calculations
  • Multi-theme support (dark/light) with smooth transitions
  • Responsive design for all devices
  • Yandex Maps integration for location
  • Review system with ratings

Data Sources & Fallback System

  1. Firebase Realtime Database - Primary source
  2. Central Bank of Russia API - Secondary backup
  3. Local JSON file - Tertiary backup
  4. Static data - Final fallback

πŸ’» Technology Stack

Frontend

  • HTML5 - Semantic markup
  • Tailwind CSS - Utility-first styling
  • Vanilla JavaScript - Business logic
  • CSS3 - Custom animations & glass effects

Backend & Data

  • Firebase - Database & hosting
  • Firebase Realtime Database - Currency storage
  • Firebase Analytics - User tracking
  • REST APIs - External data integration

Integrations

  • Yandex Maps - Location services
  • WhatsApp API - Instant messaging

πŸ›  Technical Highlights

Architecture

  • Progressive data loading with intelligent fallbacks
  • Error handling with user-friendly messages
  • Performance optimization - Lazy loading, minimal API calls
  • Mobile-first responsive design

Supported Currencies

  • USD (Blue/White variants) EUR GBP CNY RUB

🎯 Business Value

Business Advantages

  • Automated rate updates
  • SEO optimized structure

πŸ“± UX/UI Features

  • Glass morphism effects
  • Smooth animations and transitions
  • Touch-friendly interface
  • Loading states and progress indicators

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Frontend App (Tailwind + MongoDB Atlas)

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