Depends on how severe it is? I know for me that when I started having those interviews for university and/or work I didn’t clock onto the fact my stammer became more noticeable due to me being nervous about it. After I realised that, each time I had to do a presentation or interview I let them know ahead of time my stammer can make it a longer than expected, but it is not due to a lack of intelligence. Worked out in the end 99/100. Even had some previous bosses and teachers say they really enjoyed listening to me speak since I do have to think about what I want to say instead of the easy option.