I went from a similar small extreme (~10 devs) to a large company (> 2000? devs, I don't even know). The feeling I got wasn't imposter syndrome but great frustration by how slow everything moved, especially myself.
The thing that I had to grasp was the tradeoff that although it might take 5 times longer to get a feature safely shipped following all the processes, once it's 'in the wild', it's used by 10,000s more customers than if I was still working at the small company. I also spend more time trying to make my work visible while in-progress so that it levels-up the team, which is another benefit of working slowly.
I've found sweet-spot cadence of switching between 2 or 3 WIP, or gardening/grooming ideas/experimental work on the side. I don't produce enough persistent documentation (e.g. in the codebase or formal docs) as opposed to Github issues/PR descriptions that tend to not get looked at after the work is done.
The thing that I had to grasp was the tradeoff that although it might take 5 times longer to get a feature safely shipped following all the processes, once it's 'in the wild', it's used by 10,000s more customers than if I was still working at the small company. I also spend more time trying to make my work visible while in-progress so that it levels-up the team, which is another benefit of working slowly.
I've found sweet-spot cadence of switching between 2 or 3 WIP, or gardening/grooming ideas/experimental work on the side. I don't produce enough persistent documentation (e.g. in the codebase or formal docs) as opposed to Github issues/PR descriptions that tend to not get looked at after the work is done.