In a sane company, you won't be thrown into the cold water on day one.
At Valtech (where I work), you're assigned a mentor for the first weeks and it may be a day or three until you get a project assigned. Then you'll start small, like with a minor bug-task to get used to the environment.
I guess at Google and other major tech-companies, you get extensive orientation in the first days/weeks.
The point is: Nobody expects you to go full-steam-ahead on day one, or even week one.
On the other hand, the situation at a Start-Up or smaller company is probably different.
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In a sane company, you won't be thrown into the cold water on day one.
At Valtech (where I work), you're assigned a mentor for the first weeks and it may be a day or three until you get a project assigned. Then you'll start small, like with a minor bug-task to get used to the environment.
I guess at Google and other major tech-companies, you get extensive orientation in the first days/weeks.
The point is: Nobody expects you to go full-steam-ahead on day one, or even week one.
On the other hand, the situation at a Start-Up or smaller company is probably different.