I made a booking via kiwi.com and my connecting flight from Bremen is 1h30 mins after I arrive in Bremen but it's a self transfer flight. So I have to collect my bags and go all the way through security etc.
From Bremen arrivals (where I collect my bags from the previous flight) what is the fastest way to get to the Bremen departures.
Bremen is a relatively small airport. After your arrival and baggage claim, you end up in the check in hall again, where you can drop off your luggage, and after that you take the stairs or elevator to the second floor where you find the security checks for departure.
Bremen airport is small, and hence you should have no problems moving from arrivals to departure quickly.
I worked in Bremen for a few months, my office was close to the airport and from time to time I had lunch in the airport and that's just a small airport, you can go through the whole airport in only a few minutes.