The offer_id allows looking up offer details for applications table records.
For each application submitted, you can add the job title, number of disqualified candidates, etc. from the offers table. You can also add the followers for each offer (i.e., the hiring team) from the offer_followers table.
For instance, this script would add the offer information for each application:
select * from recruitee.applications a
left join recruitee.offers o
on a.offer_id = o.offer_id
And this script would add the hiring team for each offer:
select * from recruitee.offers o
left join recruitee.offer_followers of2
on o.offer_id = of2.offer_id