With the growing demand for native mobile apps, ensuring secure communication between apps and their backend servers is crucial, often achieved using HTTPS certificates from trusted Certificate Authorities. However, many developers rely on custom self-signed SSL certificates for staging or even production environments, necessitating a method to validate these certificates at runtime. The blog post introduces the concept of "Certificate Bundling and Pinning," where developers bundle the backend server's SSL certificate within the app's codebase and implement logic to validate the certificate during runtime. This approach is applied across two use cases: syncing app data with HTTPS servers and using UI widgets like WebView to load server pages. Detailed steps for implementing this method on both Android and iOS platforms are provided, highlighting benefits such as reducing repetitive setup tasks and ensuring compatibility across different device versions. While offering advantages like streamlined testing on public cloud platforms and adherence to Google and Apple guidelines, the method requires updating the bundled certificate with each server certificate renewal, presenting a trade-off between security and maintenance.