That sounds like a part-time job to me. I happened to run across this possibly relevant job opening because the company had a SWE role on the Hacker News homepage today: https://jobs.lever.co/goalbookapp-2/63b983f5-00c6-45d0-a9b2-...

(But I'm not affiliated and have no other info!) I guess a downside is that it's not an ongoing position, but on a project-by-project basis.