Taiwan starts enforcing the CFC rules in 2023. if you open a company outside Taiwan in a low-tax jurisdiction (liek Singapore), the revenue and profits of that company might be subject to taxation in Taiwan under the CFC rules. But there is some exemptions : https://taxsummaries.pwc.com/taiwan/corporate/significant-de...
If you intended to pay yourself in dividends from outside Taiwan: Taiwan Taxman will ask you if the dividends were generated from the work done while in Taiwan.
Open a Taiwan company? Probably not, it's such an hassle to get payments from the US with Taiwan's fintech (no stripe like company yet that make payment easy)
A shameless plug: if you are a dev in Taipei/Taiwan and want to talk to like minded developer, try taipeidev community: