24 August 2017
Your query is not clear. If it is a job for which you get salary it is not a supply and outside GST both in India and abroad.
If it is a business or professional service, provided your service receiver is abroad and the service you supply is also supplied abroad and you receive payment in foreign exchange, then it is zero rated. You pay tax on invoicing and take back refund after all the conditions for export is satisfied.
FYI commission business is deemed to be provided at location of supplier in India. For this business tax is payable even if payment is received in foreign currency