Building chat infrastructure for 3M users on shaky 3G: architecture decisions we made with Kupu

Everyone knows big names like LinkedIn, Indeed, and Glassdoor. But in Southeast Asia, a new wave of phone-first apps is taking over. This follows the massive success of "Direct Chat" apps in China, like Boss Zhipin (China's leading direct-talk recruitment app). Now, platforms like Kupu are changing how millions of people find work in Indonesia. In today’s fast world, the gig economy is evolving rapidly. Traditional emails are just too slow and boring. Honestly, the modern HR Tech revolution is a