Decentralized applications (dApps) are transitioning from buzzword status to practical, real-world use cases. But building a secure, scalable dApp on blockchain isn’t plug-and-play. It's more like juggling chainsaws while riding a unicycle. You need to think about fees, latency, exploits, audits, UX, and regulators breathing down your neck. In this article we will break down the core challenges of building dApps that work at scale and stay secure, and share best practices we use at IT-Dimension to help clients get production-ready, long-term resilient apps.