> easy to move

You need to stay ~12 months in your initial team; if your performance rating is bad (non-trivial chance of that after 1st year), no other team would ever touch you and you'll be slowly driven out (rare exceptions happen). 18 months used to be average stay of a Googler inside company. If you are out of luck with your team/boss, you are done internally, and this happened to many clever developers. You'd also have to get used to usual corporate CYA, internal politics and all the fun that comes along, with many developers barely doing anything but excelling in those "soft" metrics. Smaller chance of that in a startup with strong pre-selection, a mission and personal relationships, if it has solid funding.

Add to this the tendency to promote quality engineers to mediocre or outright bad managers. I witnessed a bad manager destroy the Google careers of virtually every engineer on his team.

Still, I would strongly recommend accepting the offer. Despite the drawbacks it's a great learning experience.

So easy relative to what, I wonder? I was slotted into a team which was neither fun nor anything I am into, and never managed to transfer. They said my manager wouldn't be able to block me from transferring, but he did so anyway, and I ended up leaving Google. There was nothing about the process which felt like it was any easier or less political than what I've seen at other megacorporations.

Well, easy relative to a startup which has just one engineering role (wear all the hats). In the startup world, changing roles generally means going through the interview process at a new company, starting over on seniority, vesting schedules, etc.

I'm sorry to hear about your bad experience at Google. It is a large company, so I don't doubt that there are dusty corners with bad management. But I've seen a pretty broad cross-section of the company and find most of it to be quite great in terms of mobility.