The transition is a change of profession, not a promotion of the same job. Your source of value flips from what you produce to what your team produces, and the skills that made you a great IC are no longer the ones being measured.
What changes
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BEFORE (IC) AFTER (Manager)
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Output = your code → Output = the team's results
Solve the problem → Help others solve it
Optimize your time → Optimize others' time
Deep work → Interrupt-driven work
