Ok my expert opinion: if you're satisfied with external ML services build everything with Node since you know it best, otherwise build everything with Python (both the server and the business logic). With Python you have tools like Numpy, Pandas, TensorFlow, Jupyter, web frameworks, official support by big companies to deploy in the cloud and so on.
Once you have your monolithic MVP you can circle back on what to do next. You might not even need to rewrite anything. If you have to, you can pick apart the monolith one endpoint at the time.
Start simple :)
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Ok my expert opinion: if you're satisfied with external ML services build everything with Node since you know it best, otherwise build everything with Python (both the server and the business logic). With Python you have tools like Numpy, Pandas, TensorFlow, Jupyter, web frameworks, official support by big companies to deploy in the cloud and so on.
Once you have your monolithic MVP you can circle back on what to do next. You might not even need to rewrite anything. If you have to, you can pick apart the monolith one endpoint at the time.
Start simple :)