People who would work out perfectly in the R&D division of SAS Institute are not necessarily great first hires at consumer web start-ups (forgetting the potential skill impedance mismatches). There are lots of implicit ideas about "how things get done" that are part of any group. These ideas are the culture.
e.g.
Does the team practice TDD? Do they focus on unit tests or integration tests? How is work assigned? Does the team prototype ideas or discuss them in the abstract? If someone says something you think is wrong in a meeting, do you confront them publicly or privately? 12-hour days? Do you pick tools that are cutting edge or proven? Duct tape together two open source libs for one feature or write your own? And of course, the classic: Is it better to a) ship early with known non-critical bugs, b) ship on time with no known bugs, but inadequate testing, or c) when all/most stakeholders feel confident the project is bug-free?
These questions aren't nearly as binary as I've presented them (and there are many more). If you and your potential new team don't agree on these issues that's a poor cultural fit. Like a poor technical fit, it doesn't necessarily mean you shouldn't be hired, but it does merit significant consideration.
e.g. Does the team practice TDD? Do they focus on unit tests or integration tests? How is work assigned? Does the team prototype ideas or discuss them in the abstract? If someone says something you think is wrong in a meeting, do you confront them publicly or privately? 12-hour days? Do you pick tools that are cutting edge or proven? Duct tape together two open source libs for one feature or write your own? And of course, the classic: Is it better to a) ship early with known non-critical bugs, b) ship on time with no known bugs, but inadequate testing, or c) when all/most stakeholders feel confident the project is bug-free?
These questions aren't nearly as binary as I've presented them (and there are many more). If you and your potential new team don't agree on these issues that's a poor cultural fit. Like a poor technical fit, it doesn't necessarily mean you shouldn't be hired, but it does merit significant consideration.