Building a practical backend for mobile products: first priorities

When a backend serves a mobile app, I prioritize API stability and clarity before optimizing more complex parts.

The most important pieces are usually understandable contracts, consistent error handling, enough logging for tracing, and responses that support a smooth in-app user experience.

If I were building it again for production, I would lock down versioning, authentication, pagination, and monitoring conventions very early to avoid fast-growing debt later on.