I saw some people who did not get return offer from summer intern but landed a good job. Why?

"Should his/her employer know that the person did not receive a return offer"

Absolutely not.

I know of a number of people who didn't get a return offer, and I'd narrow it down to a few things:

1. They got a bad draw and were assigned a bad manager who they didn't click with - you'd be surprised how much variability there is and how much that matters (probably 80% of your return offer depends on just what your direct report says about you.)Personally, I actually struggled significantly with the project lead on my summer internship. If I didn't bite my tongue and know how to navigate the situation I would not have received an offer.
2. There was a culture clash. The person is a good consultant, but doesn't fit with the firm itself
3. The person is smart/talented but just not right for consulting.
4. The person is not smart and not a good worker - they wouldn't be good in most jobs but are good at interviewing/lucked out on the job offer.

Not landing an offer after the internship does not mean that the person is not good. It could have a gazillion reasons, mostly outside of control of the respective intern. Also, do not forget that this is pretty much one of the reasons why many ppl do an internship. Already a MBB or elite IB internship open a lot of doors since those institutions serve as generally accepted quality certifications.

Also, besides from the intern, no one will ever find out that one did not get a return offer.

Hi,

Can you clarify your question please- landed a good job "where"?

Regardless, why is this of your concern? They clearly made some right moves and things worked out for them. 

Rather, please focus on your own learning and career moves. Learn from people experiences around you, but dont let that steer what you want to do...then you are living someone else's life.

Good luck.

Why not?

Consulting is not the end all be all and there are other good jobs out there and fitting candidates. For reasons, see Ian's answer.

Rather than finding it suspicious, be happy about the success of others and focus on your own journey. :-)

Cheers,

Florian

Hi,

there might be various reasons why a summer intern might not have got a return offer, but it certainly does not mean that the intern is not as good in any case. I would personally refrain from sharing this information actively, but it is nothing to be ashamed of. You can even turn it into something positive and explain what you learned from your experience where you did not manage to receive the return offer.

Feel free to get in touch via DM, if you want to discuss your personal situation and want some personal advice.

Cheers,

Florian

The question is rather weird to my mind. If an intern doesn't get a return offer, it literally doesn't mean anything. And most certainly it shouldn't play any role for future employers. 

Hi there,

Ian provided a very good list of reasons why you may not get an offer after an internship.

In terms of what to say to the new employer during interviews: no reason to say voluntarily that you didn’t get the offer, but don’t lie if they ask. Explain the reason taking responsibilities and without being defensive, and show what you learned from the experience.

Best,

Francesco

Why does this matter? This could've been due to a million reasons and is pretty irrelevant unless interviewing with the same place the internship occured

…

i’ve never seen an employer asked an interviewee whether they got a return offer, and why is this your concern if this is someone else’s business? what proof do you have that they were lying anyway?