Say the clock honestly
EST is UTC-5 and Vietnam is UTC+7, a 12 hour gap. EDT is UTC-4, an 11 hour gap. New York late afternoon can touch Vietnam early morning if you book that edge. It is not a three or four hour shared office day.
Pages that promise a New York business-day overlap are describing a different country.
Work that fits the gap
Follow-the-sun SRE for a defined queue. Cloud changes and pipeline maintenance that New York reviews the next morning. AI evaluation and batch jobs that do not need the product owner live.
Interactive pairing on a New York afternoon does not fit. Do not buy the pod for that.
When to choose an Australian-shaped team instead
If your users and your engineers are in Australia, use the Sydney, Melbourne, or Perth pages. The New York page exists so US buyers do not inherit an AEST overlap claim.
How a New York engagement is run
You own the cloud accounts and the on-call policy. The pod takes a written slice of overnight work. A short overlap, if you need one, is New York end of day with Vietnam start of day, agreed in advance. Interview the engineers before they join that rotation.