I've seen this company on linkedin Vanhack[0] they are a recruiting firm that connects devs with companies in Canada. Might be a good place to start. This is for the purpose of relocating to Canada of course
It looks similar to a company I have seen which takes advantage of "third-world" qualified workers by sponsoring ("relocating") them, employing them for a fix period of 2 years, probably for crumbs and the termination of the contracts resulting paying back the "relocation/visa costs". I can imagine, many people from developing countries would still willing to take the risk, but I am not adjusted to that.
I have checked, their model is different. They matching with sposoring companies, and actually they don't charge the job-seekers. Maybe relevant, however I am avoiding meat-grinder places
[0]: ca.linkedin.com/company/vanhack