Dear Sir/Madam,
I am a Geographic Information System (GIS) developer and Python programmer, with experience of working with the Google Maps APIs, and existing API keys and code I can repurpose for this task, from numerous past freelance projects.
I propose developing a Python script that will query the Google Geocoding and Directions APIs for your addresses and destinations, which can find the shortest walking distance subway to each address, exporting the address, nearest subway, and walk time/distance results to a csv file or Excel spreadsheet. I employ multiple API keys and threading, to submit a number of queries simultaneously, significantly speeding up the time needed to obtain results, although given the number of addresses to geocode and the routing queries needed, this will take some time to run (probably around a week), which I will do on a server.
I will be looking forward to hearing back from you regarding this opportunity and discussing further. If you have any questions regarding my application, please do not hesitate to get in touch.
Kind regards,
Shaun