Couchsurfing uses the same address verification method (postcard sent to your home with a code). That one is powered by Lob. Maybe this one is as well?
In Bangkok the demand for Rails developers is as strong as ever. With enough experience you will have no problem finding a job that pays better than other stacks. There are a number of companies like ours that'd be happy to help you with visa if you're willing to relocate. Happy to answer any questions! (contact info under my profile)