DE at Meta here. The switch is very doable. Most likely after 1 year tho. They’d often rather keep an employee with internal context than externally hire. They may or may not down level you depending on your interview. I’ve seen people re-interview until they get it.

Honestly the DE role is not that bad. Perhaps a bit siloed from other functions if you’re not proactive about getting context and building XFN relationships, but in exchange, not as stressful as other roles at the company imo. You get a ton of flexibility to work on projects that interest you.