You can try ORATS. Our dashboard has scanners, connections to brokers with position management and trading, backtesting, time and sales, and this week we launch a macro economic calendar and community tab.
Building an automated trading platform is a big project, and it's smart to think about the dashboard and interface first. However, platforms like Bubble.io or AppyPie might not give you the speed and flexibility you need, especially when it comes to integrating with C++ or Python for the actual trading logic. There are repositories on GitHub that could help, but maintaining that codebase can be a nightmare. Even large platforms with dedicated teams of developers face constant challenges with bugs and frequent updates. Managing this on your own could be overwhelming. For a smoother experience, you might want to consider using a one of the popular platforms readily available today. Focusing on the dashboard will take away from the important thing, trading.