Jakarta is 15 hours ahead of Portland
Best overlap: 5:00 PM to 6:00 PM in Portland is 8:00 AM to 9:00 AM in Jakarta.
Your shared working hours run 5:00 PM to 6:00 PM in Portland (8:00 AM to 9:00 AM in Jakarta). The overlap is tight at roughly 1 hour, so protect it: 5:00 PM in Portland / 8:00 AM in Jakarta is your safest recurring slot. Watch the date, too: while it's still the workday in Portland, Jakarta is already on the next day. Just remember Portland changes its clocks for daylight saving and Jakarta doesn't, so confirm the overlap whenever the seasons turn.