I have recently applied to postdoctoral positions, the applications for which are still under review (or will start the review process soon, based on their deadlines). In the mean time, I have got calls from faculty members at a few institutions I've applied to, asking if I'd be interested in working with them.
For me, the answer is always "yes!" (that's why I applied to those places!). However, I do not wish to commit to them without first knowing the status of all my applications. On the other hand, the faculty members also aren't making official offers yet --- they verbally say they would love for me to join their groups as postdocs, etc. It's not clear to me if they are simultaneously scheduling such calls with multiple candidates.
What is the best way to express interest and enthusiasm without committing (or appearing to do so)? I fear that overcommitting and then switching to someone else would massively burn bridges (besides feeling really wrong to me); on the other hand, I fear that not appearing enthusiastic enough on such calls might make these faculty back out of making me an official offer.