Ask HN: How to effectively run a small dev community on WhatsApp?

I've started a small community with a few friends in the video-automation space. Our main goal with the community is to have high quality engagement and information sharing in our field, by communicating with members we are familiar with and trust. We are not aiming for really growing the amount of community members, rather for the quality of the engagement within it. With time I guess the amount of members will grow naturally.

Would love to hear if anyone has created communities with similar goals, what was the process, what worked well, what didn't work well, and in general if you have any tips to share.