What is a well-executed application?

A well-implemented application in Go is such an application that:

• Correctly and stably operates: performs its functions without failures and errors.
• Readable and maintainable code: code written following Go idioms, understandable to other developers.
• Efficient resource usage: optimal memory and CPU consumption, no leaks.
• Error handling: all errors are correctly handled and logged.
• Testability: covered by unit and integration tests.
• Documentation: functions and packages are documented with comments understandable to users and developers.
• Concurrency: properly uses goroutines and channels, avoiding data races.

Example: if the application works with a network, it should correctly handle timeouts and connection errors, without blocking main threads or crashing.