I am looking for something short-term to add to my profile to pursue a career in teaching English as a second language. What course would you recommend?

Dear,
I can advise you can take the below following:

(1) TESOL - (Cert TESOL) is an accredited professional qualification awarded in the teaching of "English for speakers of other languages" (ESOL) by Trinity College London. It is a commonly taken teaching qualification in the field of English language learning and teaching (ELT).

Regards
Hassan Daw

There are different courses you can attend, which will enhance your knowledge, skills and take your profile to another level. 

* Cambridge Advance English: It is a course which is just before IELTS and is considered almost equal to IELTS. 

* Certificate in English Language Teaching to Adults: we do not offer this course unfortunately. but once u r CELTA certified, you are a certified international teacher. 

* DELTA ( similar to CELTA but it is a diploma), both CELTA and DELTA are expensive and a proper institution has a right to conduct them. 

I will recommend you the mentioned below certificates from cambridge.
The qualifications and courses below are listed by the stages they cover on the Cambridge English Teaching Framework, Cambridge Continuing Professional Development framework.

1- CELTA
2- TKT
3- CELT-S
4- CELT-P
5- Language for Teaching
6- DELT
7- EMI
8- Train The Trainer

Hi Shweta! We do recommend you to take either a Business English course or to take IELTS preparation course followed by the IELTS exam.

Hello Shweta,
would you please like to share your academic background and current profession? Generally, it is advisable for you to go for IELTS. definitely, it would be a great addition to your professional portfolio. 

Hi Dear,

See, we recommend that you take CAE (Cambridge Advanced English), and General English, these courses are the most common and demand is high for these courses (always). It also depends on the field you work in, the society and environment you’re targeting with that certificate. For example, there are certain courses in English for banking, business and more. 

Moe Braik
Marketing Manager

Hi Shweta! We do recommend you to take either a Business English course or to take IELTS preparation course . 

IELTS is best opstion for you.
we have also courses to develop skills in Teaching