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Should you join a startup?

You should if you are passionate about learning new things and going through the pains of scaling the team and inventing something new.  But there are some cons also:

1) your healthcare benefits may suck. So if your wife has good benefits then this may be a moot point.

2) Your HR may suck, you might have no or non existent HR and sometimes small things can take an ample amount of things to be done. Like getting a document for your greencard process can take 2-3 months so dont join a startup if you are waiting for greencard as you can run into complications if the startup closes shop.

3) Startup may be demanding on you but at other times it can be a lot flexible also.

So if point 1 and 2 are not of concern then yes offcourse you should join it.

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