Building FloatForex.com — Lessons From Shipping a Live Forex Rate App With React and FastAPI

I want to tell you about the three mistakes I made building FloatForex.com, because the mistakes are more useful than the success story. The app itself — a real-time currency converter with live gold prices, forex rates for 60+ currencies, an AI chatbot, and a handful of financial tools — is live at FloatForex.com. It works well now. Getting there involved some genuinely embarrassing decisions that I would rather other developers not repeat. Here is what I built, how I built it, and where I went...