What methods and technologies were used to transmit data via serialization at your previous workplace?

At the previous job, the following methods and technologies were used for data serialization:

• JSON — the most common format, serialization and deserialization using Codable in Swift.
• Property Lists (plist) — for storing settings and simple data structures.
• Protocol Buffers (protobuf) — for efficient binary serialization when exchanging data with a server.
• NSKeyedArchiver/NSKeyedUnarchiver — for serializing complex objects in iOS.

The choice of a specific method depended on requirements for performance, readability, and data volume.