“Well, I think you'd be a great fit for our team.”

You're hiring someone for a job in your department. You've interviewed someone who you would like to hire. You want to offer him the job. You say:

Well, I think you'd be a great fit for our team.

Well,

You use "well" to change the topic of a conversation: 

Well, hang in there.

...or to signal the end of a conversation:

Well, it's nice to have you back.

Well, I look forward to working with you.

In the example at top, the speaker was asking interview questions. But now he wants to start to make a job offer instead. So the topic isn't entirely changing, but the tone of the conversation is changing.

a great fit for (a job)

This phrase is often used when talking about open positions and job applicants. If you think that a person is "a great fit" for a job, it means that you think they can do the job well.

You might get a question like this in a job interview or on an application form:

Why would you be a good fit for this position?

If the company rejects you, they might write this in an e-mail to you:

Unfortunately, we don't feel that you'd be a good fit at this time.

You can also talk about it the other way: a job can be a "great fit" for a person:

I think this job would be a great fit for you.

I was a middle school teacher for a few years, but it wasn't really a good fit for me.

our team

In business, people often call the group that they work with (their company or department) a "team". For example, if a company wants to hire people to work for them, they'll put a link on their website which says:

 Join our team.

Small companies also advertise the people that work there in a section on their website titled "Our Team".

And if you want to praise the people who work for you, you can say this:

We've got a fantastic team here.