If you join the company, there will be a lot of things that will not work perfectly and yet you will be asked to do things anyway. Everything is in constant flux at any startup because of growth and at large companies things are broken because of entrenched mistakes.
If everything works perfectly it means the company obsesses over its internal processes to the point of ignoring everything else. Which is also a problem.
There exists no company that is in a state of change where everything works perfectly. And every non trivial company is always in a state of change.
If you can't get over one broken form you simply aren't cut for the job.