Been working in small startups and am thinking to move to a company with a stronger design culture. I'm a mid to senior level looking to become more senior and have good mentorship. What companies should I look at for product/interaction design roles?
Big blue has a good design team. Design.ibm.com
Anything with a big name. Get a contracting job at Google or Facebook for anything remotely related for one year. Double your income at the next job.
Sumo logic
I'd work there! Those are some really cool challenges for a curious, inventive designer.
PD? Apple for sure
Dropbox!
Anything you experienced at Dropbox that made the design culture and experience good?
Well...look at their products. Or rather, think about using them. If you even have to think that much because they're that easy to use. Some of the best design out there I think.