In case you want to get a Vietnamese business visa this way, you have to visit the nearest Vietnam embassy/consulate. You can find the list of Vietnamese embassies and consulates worldwide here.
The application process for a Vietnam business embassy visa will be as follows:
Step 1: Get the Vietnam business visa sponsorship letter
Your sponsor company in Vietnam will apply for your Vietnam business visa sponsorship letter (also known as Vietnam business visa invitation letter, business visa approval letter, or Vietnam entry permit) with the Vietnam Immigration Department. The documents are:
Photo of foreigner’s passport
Certified copy of Business registration of the sponsor company
Form NA2 (to be completed online here https://www.xuatnhapcanh.gov.vn/huong-dan-dvbl-xdnc)
Form NA16
other documents as required.
This process will take around 5 – 7 working days from receipt of the full required documents by Immigration.
If the application is approved, the Immigration Department of Vietnam will
issue the sponsorship letter to your sponsor, and also
fax a letter for your business visa stamping to the registered office of the Vietnam embassy/consulate.
Step 2: Prepare documents for Vietnam business visa stamping
Your sponsor will send the invitation letter obtained in step 1 to you. And you will print it out, and put it with other required documents, including but not limited to:
a completed Vietnam visa application form,
your original passport,
your photos, and
visa fee which depends on the embassy/consulate.
Step 3: Get Business visa stamp
You submit your prepared documents to the registered Embassy or Consulate of Vietnam by mail or in person, depending on its regulations.
Once your Business Visa has been approved, it will be affixed to your passport and you can use it to enter the country.
The process to get a business visa on arrival is almost the same as getting an embassy business visa. However, instead of getting the visa stamped by the Vietnam embassy/consulate, you will get it stamped at Vietnam airport upon your arrival then.
Its process is as follows:
Step 1: Get the Vietnam business visa sponsorship letter
Your sponsor in Vietnam will get the business visa sponsorship letter from the Vietnam Immigration Department and send it to you.
Step 2: Prepare documents for business visa stamping
You will need to prepare:
print of your visa sponsorship letter,
a completed Vietnam visa application form,
your original passport, and
your photos, and
visa stamping fee, which is:
US $25 for a single entry visa, or
US $50 for a multiple entry visa.
Step 3: Get your business visa stamped
Upon arrival at Vietnam airport, you will need to show the documents mentioned above to the Vietnam Immigration Officer to get your visa stamped onto your passport and then complete the entry procedure to enter Vietnam and do your work.