In this live-coding video, you will watch me prototype a financial "Software as a Service" (SaaS) application in under an hour. At the end of this video, we will have an application for tracking stock prices. It has user accounts, per-user portfolios, and a monthly credit-card charge for using the service.
Follow along as we start from a single stock chart and build up to a full subscription service. You can also copy the source code and explore it yourself: