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What software do you use to implement algorithms like this? Do you have to write your own python/other scripts and interact with trading API's for whatever service you use, or are there nice pre-written open source trading algorithms that make building stuff like this easier.

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I just downloaded historical data on Yahoo Finance and parsed the CSV files. There are definitely more efficient ways to do this.

Does the endpoint on Yahoo Finance just download the CSV file? Could use a node HTTP fetch go nab the latest CSV, check if it's new, if it is throw it in the data set then run the algo.

I'm not familiar with Yahoo Finance so I'm not sure how feasible this is.

Since the question was "How do you implement this" I assume they meant how do you automate the actual trading, not how do you run a backtest.

There are cloud services which will run your trading algorithms.

Here's one I found just with a google search: https://alpaca.markets/

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