B2B SaaS indie hackers: How do you qualify inbound leads?

Hi all,

I've worked as an engineer at several startups now that appear to be running into the same problem. Namely, how to segment inbound leads between "junk" leads (not worth your time) and qualified leads. I'm confident I've come up with a helpful solution for some, but I'd love to hear about how you all qualify leads/whether there are any pain points there.

Thanks!