In the 6 year history of PayPay, we have experienced rapid growth. We now serve over 67 million users and millions of transactions per day! But this success comes with engineering challenges to meet the traffic and reliability demands. Since day one, PayPay has been powered by Java and NodeJS and these technologies have served us very well. However, as we have grown we needed to scale up our deplo
Posted on August 1, 2025 2x Performance, $300k Savings: A Case Study in Rewriting a Critical Service in Rust A Tale of Scale: When Your Service Hits a Wall In the world of high-traffic systems, success often brings its own set of challenges. During my internship at TikTok, one of our core payment services—a reliable workhorse built in Go—began showing signs of strain. As TikTok LIVE’s user base gr
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