Ask HN: How do you conduct technical interviews

I'd like to ask how other small- to medium-sized companies structure their technical interview process:

Do you use commercial tools (e.g. coderpad or similar) or your own custom-built or ad-hoc solution?

As a non-technical person, hiring my first developer was harsh. I had to rely on the candidate's curriculum and trust my instinct.

I wish I had a tool to help me.