[yokaze]

What is causing the end-less work? Have you communicated your limits to your manager, or do they simply not care? How about your colleagues, do they feel the same?

Talking from personal experience, as I am a "good worker", and tend to take up every problem I see and solve it. Which is kind of self-exploiting and not sustainable in the long-run. I have to actively remind myself that setting limits and communicating them is part of the job, as otherwise you'll end up burnt out. The difficulty here is, it may be even okay in some short-time frame, it is not black and white.

Just food for thought: Would it be an option to be also frank about it to future employers? E.g. I am currently not at the top of my skills due the current work-load. Would they be willing to re-negotiate after a certain time of working part-time to recover?

Personally, I value in a company (or team) more that they treat you humanely, than having a pay-check which is possibly three times as high as now. But that is the luxury of having a high salary.