Scheduling guide
This is one of the toughest common pairs: Singapore is 12 to 13 hours ahead of New York (UTC+8, no daylight saving), so the two 9-to-5 workdays do not overlap at all. When it is 9:00 AM in New York, it is 9:00 or 10:00 PM in Singapore. Someone always meets outside normal hours.
The least painful windows are the edges: 8:00 to 9:00 AM New York time is 8:00 to 9:00 PM Singapore time, workable for an occasional call if the Singapore side agrees. Alternatively, 7:00 to 8:00 PM New York is 7:00 to 8:00 AM Singapore, which suits early risers. Pick one pattern per relationship and stick to it so the inconvenience is predictable.
For ongoing collaboration, lean on async: shared docs, recorded video updates, and a 24-hour response norm beat a weekly 9:00 PM call. When you do meet live, rotate the burden monthly, keep the agenda tight, and never schedule Friday evening Singapore time: that is Friday morning in New York, but it eats your colleague's weekend eve.