I lived there almost a decade and know the visa process. Get started on paperwork for an F-6-1 visa. It will allow you to work without restrictions. Your best options for work are Kakao (KakaoTalk) and Naver. They have solid Python development capabilities. Coupang is their best ecommerce company.
Go check out the paperwork on visas:
https://overseas.mofa.go.kr/gb-en/brd/m_20265/view.do?seq=66...