Tokyo in general pays less than America or even China for software engineers, just be warned. If you are at Google, you can see if you can work in their office there. Facebook also has a Japanese operation, but most of it is localization rather than worldwide R&D. A friend of mine worked as a designer for Phillips for a few years and enjoyed it, but I don't know of many engineers who did the same.
To be honest, if you really are that senior, it would be much easier and financially rewarding to work in China if you are interested in Asia.
To be honest, if you really are that senior, it would be much easier and financially rewarding to work in China if you are interested in Asia.