Google Earth Engine has ALL Sentinel-1 GRD processed to geocoded calibrated backscattering (10 m pixel spacing) already. On Copernicus DIAS instances (cloud compute coupled to the Sentinel archive) you can order Processing-as-a-Service with unit prices per GRD (around 0.3-0.5 Euro per GRD scene to get the same. I don’t know where USD is, but chances are that not all DIAS instances may have that in archive.
If you only have a single workstation (and no money to spend) your best bet is GEE.
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