A senior developer will cost more per hour than a junior developer but will take less time to develop the code.
Material costs Material costs include training individuals on new techniques or software. Time costs Consider contracting out difficult elements if you don' t have the internal expertise to make it happen.
Human-effort costs Junior people who are absolutely positive they can get the task done are a blessing because of their go-get-it-ness, but they can drive tasks down because they "spin their wheels" on things that more senior people have already done.
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