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Of course you can call yourself an engineer without formal training in the US. https://www.vice.com/en/article/man-fined-dollar500-for-crim... https://www.vice.com/en/article/oregon-unconstitutionally-fi...
I don't get the down voting. This dude is correct. An "engineer" is typical like a "doctor". Yes I also carry the "system engineer" with me, and yes I have university background, but it's far far away from any serious engineering what's usually done by computer people. I would also argue that an engineer more or less knows what he's doing and can predict the outcome. Most people I observe while they use a computer it's literally a monkey beating metal with flesh....
I'm Canadian as well and type this while wearing my ring, but I've come to accept that Americans use the term differently from Canadians and that's just fine. The Canadian definition is directly downstream of the Quebec bridge collapse, it's a pretty neat bit of Canadiana.
Just like writing favorite instead of favourite, while I'm here, I think the right thing to do is respect the customs of the country which welcomed me. It would be very ignorant of me to pretend I'm more of an engineer than my American colleagues with CS degrees.