National Immigration Agency and Bureau of Consular Affairs system interface system is online for foreign professional visa application.
Please start from the portal of the Immigration Department’s foreign professional application window platform.
https://coa.immigration.gov.tw/coa-frontend/four-in-one/entry/

Other foreign visa applicants, please apply to the official website of the Visa Online Application of the Bureau of Consular Affairs of the Ministry of Foreign Affairs and click the [General Visa Applications] function. https://visawebapp.boca.gov.tw/