[GoldenMonkey]

With most trading platforms. The api is available to do the trades. Obviously, look on github.com for projects, tie-ing into the trade platform of choice.

This platform, allows one to do automated trading based on your own strategy. US only traders, for now. https://www.composer.trade

If you are just doing portfolio re-balancing. Say, twice a year. You could re-balance based on each stock's risk parity.

i.e. Risk parity is an approach to investment portfolio management which focuses on the allocation of risk, rather than the allocation of capital. The risk parity approach asserts that when asset allocations are adjusted to have the same level of risk, the portfolio can achieve a higher risk-adjusted return.

Some Quant Resources: https://quantpedia.com

They teach a class on quant. Pretty good. Python oriented. https://quantscience.io