Oper-Kassa — Currency Exchange Website

📋 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.

🚀 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

💻 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

🛠 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

📱 UX/UI Features

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