Professional Engineers Act Article 52

If a professional engineer who holds only a professional engineer certificate but without a professional engineer license, suspends their professional practice voluntarily, or dose not join the professional engineer association practices the profession without authorization, the central competent authority shall order them to cease such practice and impose a fine between not less than NT$30,000 and not more than NT$150,000. If the unauthorized practice is not ceased, penalties may be imposed on each violation basis.
中文原文 技師法第52條
領有技師證書而未領技師執業執照、自行停止執業或未加入技師公會,擅自執行技師業務者,中央主管機關應命其停止,並處新臺幣三萬元以上十五萬元以下罰鍰;其不停止行為者,得按次處罰。

English translation for reference only; the Chinese text prevails. Not legal advice.