I do it, though I do 30 hours so it's three 10-hour days, and I get 75% of my "normal" salary. I started out full time, and after about a year or so I went to my manager and said "how about I work 30 hours?" and he said "sure".
It's a big company which HN would probably scoff at, and we work with super uncool things like Oracle. But it's just a job, and I get to spend Mondays and Fridays with my young kids.
When I was a young graduate, I didn't feel like working 5 days a week. I had many activities that I didn't want to sacrifice.
At job interviews, I asked about part-time and surprisingly, some companies were fine with that. At least, until I got hired, then I was quickly pressured to switch to full time (eventually, I moved to academics which suits me better).
Large institutions can be surprisingly good about this. Government jobs in the UK, for instance, tend to be pretty open to job-shares. Look for companies supportive of working mothers -- if they have systems in place for parents to work part-time, they may well be prepared to accommodate you on similar terms.
It's a big company which HN would probably scoff at, and we work with super uncool things like Oracle. But it's just a job, and I get to spend Mondays and Fridays with my young kids.