I think less than 1 year at a job consistently will look bad on your resume (or CV), especially all those less than 1 year jobs is at different companies.
For most developers, it takes average of 3 month to become productive on a new code base.
From a hiring manager perspective, they'll think two things:
of course, if it is internships, it is expected every 3 to 6 month. that is ok.
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