Location: South India.
Season: Rainy Season.
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The easiest way to find out the name of this tree is to realize that the flowers (and therefore the fruit) are in the form of a raceme.
Googling India bright orange fruit raceme in Images quickly brings up your specimen among others.
The name of that image leads to other sites discussing the plant.
Species: D. erecta
Duranta erecta is a species of flowering shrub in the verbena family Verbenaceae, native from Mexico to South America and the Caribbean. It is widely cultivated as an ornamental plant in tropical and subtropical gardens throughout the world, and has become naturalized in many places. It is considered an invasive species in Australia, China, South Africa and on several Pacific Islands. Common names include golden dewdrop, pigeon berry, and skyflower.