Yes, not mandatory. The school I interviewed at wanted it. Different schools have different requirements. Agreed. For me I thought it was worth it to go through the process to gain some exposure to what I might expect. It's totally different but the TEFL forces to pull something together which is what I ended up having to do. It will give you great experience using ChatGPT or other AI tools to create parts of your lesson plan.
Awesome experience. They will love you. Get the TEFL. Do it online. I did. I used The TEFL Academy. It will take about a month. Nice and cheap no one cares where or how you got it. Don’t fall victim to the high price scams and vision of grandeur. They are experts at SEO marketing and sales not getting you a job.
Don’t waste your time applying for jobs in Thailand from outside the country. Get your TEFL, go to Thailand, get a job. This was the advice I got from someone online and that’s what I did.
Don’t waste your time on those teaching jobs in Thailand groups.
Start studying the job posting on ajarn but don’t apply. Once they know your here they will call you. Get your profile ready for ajarn.com. Make sure it shows you are now in Thailand. Schools will call you.