Manolis Xatziemmanouil

Documentation

Currency Converter is a small PHP project I built to demonstrate how I structure and write code without relying on frameworks or dependencies.

The goal isn't complexity. It is clarity. Even a simple application can show how someone thinks about architecture, APIs and clean code.

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This project has two parts:

Server Side (Internal API)

The server exposes two JSON endpoints:

• Converter: https://currencyconverter.xman.gr/Server/converter.php
• Available Currencies: https://currencyconverter.xman.gr/Server/available_currencies.php

The internal API fetches real exchange rates from an external source and returns them in a clean JSON format.

Client Side

The client runs on a separate domain.

Because of that, instead of calling the service API directly (and dealing with CORS), the client sends requests to a small PHP proxy.

The proxy communicates with the internal API and returns the result back to the browser.

When the page loads:

• The client asks the proxy for the list of currencies
• The dropdowns are populated
• When the user clicks Convert, the proxy sends the request to the converter endpoint and returns the converted amount

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Development Notes

I built the UI using a lightweight HTML template and wrote all the backend logic myself.
The point of this project is to present a clean, simple example of how I like to organize code: small files, clear responsibilities, and easy-to-follow structure.