1. There is basically no career plan. The difference between an expatriate company and other companies is that it mainly exports labor to other companies and then earns the difference. To put it bluntly, it is a large intermediary company.
2. unstable. The project will employ foreigners, mainly to facilitate the adjustment of the budget. If you have less money, you will dismiss a few dispatches and wait until you have a budget. The last economic crisis led to the closure of many overseas companies in Japan.
This work has no technical content. Japan is relatively conservative, so few companies are willing to let foreigners participate in advanced design (except those that are particularly excellent).