I recently decided to leave a job that I enjoyed for an opportunity that fell into my lap from an ex-colleague, who is my new manager.
First week in, I realize that despite being hired as a senior, there are no senior responsibilities. Had I known that this beforehand, I would not have taken the opportunity as it is a step-down for my career compared to where I was. I have talked to the manager about this, but it is clear that the senior title does not mean anything in the new team.
As I left the previous place in the best possible manner, I have a high chance of being accepted back.
The question for me is, should I leave immediately (within the first month) or wait it out 6 months, then leave? Prior would allow me to return to the job I am happy with, but I'd have a month gap in my resume working for the same company, and I would obviously burn bridges. The latter would be more easy to explain and wouldn't burn the bridge as hard (hopefully). I think a 6 month stint is easier to explain than a 1 month stint.