I have been in a similar situation. I didn't have a hard date of starting a new job to meet, but I had my own plans and a rough date of when they needed to get

I have been in a similar situation. I didn't have a hard date of starting a new job to meet, but I had my own plans and a rough date of when they needed to get started by. The project that I was on was originally supposed to ship in December. Then it slipped to January. People started working 80hr+ weeks, though I said no to that. In January, there was a big, dramatic meeting with execs giving speeches, saying we needed to push it back 2 months instead of 1 month to make sure we had enough time to "do it right". March came and guess what? They pushed it back again another month. This time so quietly that it was like a top secret rumor or something. They did finally manage to release it in April, still as a total mess. I turned in my notice the week after. Luckily for them, that's about when I was planning to leave anyways. If they had pushed it back again, I wouldn't have felt any hesitation in leaving before the release, because I have my own plans that I'm not about to change, and they have no clue when they're actually going to release. In your situation, do you have any confidence that they won't keep pushing the release back for months and months? I wouldn't. I expect whoever manages or hired you there originally will not like it. But given that they're responsible for this state of mismanagement and the only thing that would make them happy is you working killing hours for pocket change, I wouldn't be worried about what they think. You can bet that anyone else in the industry who knows of this knows what kind of group they run and wouldn't hold it against you for leaving like that. You have a new job to think about, and I'd be a lot more worried about what your new manager thinks of this. I think they would not like it at all if you tried to push back your start date to meet the schedule of a mismanaged project that they have no assurance won't push further back.