Hi,
I'm a native Bangladeshi and I'm very proficient in both Bengali and English. I believe that I can be the person that you're looking for. Because as a translator I'm very confident that I can handle anything when it comes to translating and transcribing English to Bengali or vice versa. I've worked for FluentU, a language learning website and app as a translator in a long-term basis. I've subtitled several videos for TED and I've also worked as a volunteer translator in U-report, a project of UNICEF.
I hope that you'd consider me as a potential candidate. Eager to hear from you soon. Cheers!