Most "cross-platform" war stories are really UI stories: one framework draws the same button on two phones and everyone calls it a day. The one I want to tell is not that. At Geonode I built the Repocket C# SDK, a single networking core that had to run on Windows, Android and iOS and carry all the logic for internet sharing on every one of them. One codebase, three very different runtimes, and a piece of software that lives in the background of someone else's device and must never misbehave. ...