Honestly I have not asked. I've poked around in the HR guidelines for companies I've worked for (big tech companies) and the provisions for less than full-time work are either non-existent or so full of unfriendly exceptions and approvals that I assumed it wasn't a realistic option. I have also never seen or heard of anyone doing it at those companies across the hundreds of people I have worked with.

I'd love to hear if anyone at a FAANG pulled it off, how they did it, and what the financial impact was.