As far as I know many devs from Canada working at large companies, such as Microsoft and Google, are brought in under the CSA title. You just need to be careful

As far as I know many devs from Canada working at large companies, such as Microsoft and Google, are brought in under the CSA title. You just need to be careful what you say at the border. I've worked under a TN, but am now thankfully switching to an H-1B which is supposed to be a much more pleasant border crossing experience.