Ask HN: How do aquihires work? 14 years ago
This seems to be a pretty common story around aqui-hires. I've heard of very few instances where two separate companies can mesh successfully after an acquisition. If nothing else, it makes me pay much closer attention to company culture with potential new employers.
For better or worse, company culture will have probably the largest impact on whether you enjoy your job - even more than tools/programming languages/hardware/etc.