Ask HN: How do you interview and evaluate candidates at a startup?

I'm curious to learn what's your process to interview and evaluate candidates at an early stage startup?

Do you have any methodical process to make sure your decisions are as accurate as possible? is it helpful? Do you use any tools in the process?

Context: I'm thinking about building a lightweight tool that will help startups introduce some research-driven construct to their process.

The goal of this tool is to help with 20% of the process that account for 80% of the gain in terms of making sound, unbiased hiring decisions. What do you think about that?