As a senior dev with 40+ years in many, many frameworks and languages:
No feedback when you are turned down
Do you want to move clear across the country for a 3-6 mos. contract ?
Please complete this (20+ hour) project for free.
Please take this basic skills test and you will be timed.
I really expect to have a conversation about my past experience and current interests/goals with the object of whether and how I can help the prospective employer. I would expect the employer or recruiter to check my references (they've stopped doing that for some reason).
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