Grokking Staff Engineer Interview
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Estimating Effort and Risk

The seller tools team estimated 6 weeks to move seller sign-in to the company's new identity service. The work took 19 weeks. The team's code was not the problem: the tasks it had listed took about as long as planned. The 13 extra weeks came from work that was not on the list.

Cause of the delayWeeks added
The mobile app needed a new release, and sellers took weeks to install it5
Shared seller accounts, where several staff use one login, had never been listed4
The security review had a queue3
One engineer spent a week on an unrelated incident1

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