Ask HN: What are some side hustles for Software Developers?

I'm soon to start a family with my fiance and been thinking a lot about my income. I work in NYC where rent is high. I'm making 70k a year as a Software Developer. I'm grateful to have a job during this economic downturn.

But I wonder what are some side hustles I can do to make some money on the side? I was thinking about doing Instacart, but I have software engineer skills why not use those?

Are there any side hustles you recommend on doing?