The "free" health insurance - which your taxes pay for - is great for some things but non-existent for others (e.g. routine oral care, routine optical care, physiotherapy required by something other than work, etc). Realistically, you need extended health insurance if you're not elderly, disabled, or on some sort of social care.
Now the nice thing about taxes in Canada is that you won't be taxed at anywhere near the highest bracket. As a Canadian software developer you're looking at around 50% of the salary as your US counterparts [1] which means you'll be in one of the medium tax brackets.
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