Filecoin's reference client is called "lotus" and it's written in go.

lotus installation: https://docs.filecoin.io/get-started/lotus/installation/

-> it says you can run in the cloud for $100 credit.  I did not receive a credit when I tried this.  The user-experience involves handling fewer crashes with more ram and disk, which gets expensive quickly.  There is a bug in the digitalocean image where it download the chain from a web source every reboot.  I submitted information on fixing the bug to their github and am not aware of having received a reply. 5:57a

Data storage tutorial: https://docs.filecoin.io/get-started/store-and-retrieve/store-data/

This talks about cli usage but does not indicate remote nodes.

Eureka: I think lotus (maybe it was another node app?) has a lightweight mode already built in.

Subgoal:  see if lotus has a lightweight, remote-use mode.  Finding discussion of this is likely to find at least one remote-use node.