For other stories of X => Go rewrites, I started keeping a list at https://quicknotes.io/n/vzb7-rewritten-tales-of-rewriting-s
Since our transition to Golang we haven’t looked back. ... we’ve begun the process of modularizing our code base and spinning up microservices to handle specific roles in our system.
If you have more links, I'll be happy to add them.
I have a much longer list of companies that use Go (https://quicknotes.io/n/1XB0-companies-using-go) but it's harder to find descriptions of rewrites than find out who's using Go.