1.TALKING NET Office based ESL tutor, online, offline 2 years 2012-2014
2. 51TALK- Chinese ESL company, 2014-2017
3. ANYTALK WORLD- Korean ESL company, - online , 2015-2016
4. FACETALK- Chinese company, 2018
5. TELLA Korea- Chat based ESL tutor 2019-2021
6. PRIVATE ENGLISH TUTOR to a Korean student- July 2021-present