Best companies I've ever worked for are the ones that didn't care if you were a product of some niche culture. Are you nice? Can you get the job done? Great hired. I work with a few middle aged women from India, old men from Pakistan, young Canadian interns, and a few multi lingual mid aged coders as well. We never got along better, always something to talk about.
I wouldn't recommend trying to mould yourself to a particular "culture", just make sure your skills are on par and you're not a dick, and you'll find a job. I wouldn't want to work at a place where my height or anecdotes had any bearing on my skills as a developer, because ultimately it's a job and my height isn't going to get it done.
The problem is most start-up founders like to hire in their own image...
If you're not in your 20's, don't drink alcohol everyday, don't have a degree from Stanford/MIT/UC Berkley, and want to get home to see your wife/children by 7PM then you're "not a cultural fit"
And you probably don't want a job with most startup founders.
You're looking for the startup founder who is able to see beyond his own preconceptions, because he will most certainly need that skill to survive in the marketplace.
Then I hope those companies fail because honestly, if you're working a clean efficient 7.5, there is no reason why the work shouldn't get done. Hire GOOD people, not mediocre slaves.
I wouldn't recommend trying to mould yourself to a particular "culture", just make sure your skills are on par and you're not a dick, and you'll find a job. I wouldn't want to work at a place where my height or anecdotes had any bearing on my skills as a developer, because ultimately it's a job and my height isn't going to get it done.