Tell about the release of a client-server application: how it happens, what are the nuances?

The release of a client-server application typically involves several stages:

1. Build preparation — creating a stable version of the application that includes all necessary changes.
2. Testing — verifying the functionality of both the client and server parts, including integration tests.
3. Server-side deployment — updating server software, often using CI/CD, with minimal downtime (e.g., through blue-green deployment).
4. Client-side update — if it's a desktop or mobile application, it may require publication in app stores; for a web client — updating the frontend on the server.
5. Monitoring and rollback — after release, it is important to track errors and performance to quickly revert changes if necessary.

Nuances:

• Compatibility between client and server versions — it is important that new versions interact correctly with current ones.
• Managing database migrations — schema changes should be coordinated with the release.
• Security assurance — updates should not create vulnerabilities.
• Communication with users — informing about timing and possible operational restrictions.

Thus, a release is a complex process requiring coordination between development, testing, and operations teams.