For context - I worked as a software engineer in the past six years and took a career break this past December due to burning out of the job. I am looking to ease my way in by working part-time as an engineer, but I couldn't find such postings online anywhere.
Just finding a part-time role like a full-time one, where you find it on a job board, or LinkedIn, or some company's career page is extremely rare.
What's more common is that you are at a full-time job and you negotiate down to part-time because the company already knows you're good and they'd rather keep you part-time than lose you completely.
Other options include freelancing where you choose your own hours and time, but then you have to do sales. There's also many marketplaces that will do the sales for you, but there's no guarantee of work. IMO software agencies are likely to also be a bit more open to flexible and part-time work.
I dont love shilling my own stuff (who am I kidding I do), but I wrote a guide for this exact question on my newsletter: https://www.parttimetech.io/p/work-part-time-as-a-software-e....