I need a straightforward e-money exchange website built from scratch. The first release will handle USD-to-USD transfers only, yet it still must show live rates so I can expand to other pairs later without re-coding the engine. Core requirement • Real-time currency conversion pulled from a reliable API (you may suggest one you have used successfully). What I expect at hand-off 1. A clean, responsive front-end where customers can enter an amount in USD and instantly see the converted amount (even if it remains USD today, the logic should be fully dynamic). 2. Solid back-end logic that fetches and caches rates, then performs the calculation. 3. Clear documentation so my in-house team can plug in additional pairs such as USD-EUR or EUR-GBP when we are ready. Feel free to use the stack you are most comfortable with—PHP/Laravel, Node.js/Express, Python/Django, or similar—as long as the result is secure and easy to maintain. Payment gateway integration is not part of this phase; the focus is solely on the conversion workflow. Let me know your proposed tech stack, timeline, and any questions you might have about the flow.