As an employee, you'd have to find a job or go as a "language student." As a founder, you can either incorporate over there (expensive but not prohibitively so)

As an employee, you'd have to find a job or go as a "language student." As a founder, you can either incorporate over there (expensive but not prohibitively so) or set up a representative office and move yourself as the employee over there (actually cheaper than going as a language student).