Question
I have a BA in English, and an MA in Linguistics besides the MA in teaching ESL. I will have taught 100 hours independently when I graduate.
Answer
Yes! You will mostly likely need a TEFL certificate to remain competitive in the ESL teaching market. Most Asian countries are hiring ESL teacher on a high demand. Having teaching experience isn't good enough to get yourself exposed in front of the big companies. A combination of advanced education and experience alongside certification will get you a stellar job as a ESL teacher.