Had the Turakhia brothers not executed the world’s largest advertising tech deal on Monday, the two would have continued to be unknown, something they’ve enjoyed through their nearly-two decades long journey as tech entrepreneurs. On Monday, their firm Medianet was acquired by China-listed Beijing Miteno Communication Technology (BMCT) for about $900 million.

Bhavin (36) and Divyank (34), commerce graduates from noted colleges in Mumbai, have been serial entrepreneurs from their college days in the late 1990s. That was when the dotcom boom was gaining steam and companies ...