Mobile Sandbox RPG Development

I’m planning a sandbox-style, hang-out role-playing game for mobile devices and want a seasoned game developer to bring it to life. Players will be able to switch seamlessly between first- and third-person views while exploring an open environment, socialising, completing light quests and customising their avatars.

Here’s the core of what I need:
• A solid gameplay prototype that proves the sandbox loop, camera switching and basic avatar controls all run smoothly on current iOS and Android hardware.
• Networked multiplayer that lets friends drop in and out of the same world for casual hang-outs.
• A clean, touch-friendly UI plus simple gesture controls.
• Optimisation and mobile-specific performance tuning, including scalable graphics settings.
• Build delivery (APK/IPA or TestFlight) and brief technical documentation so I can iterate on content later.

I’m open to Unity, Unreal or any other engine you’re comfortable with, as long as it supports mobile publishing, in-app updates and future content expansion.

When you reply, please share one or two mobile titles you’ve shipped that feature either sandbox mechanics or multiple camera perspectives, noting the engine you used and the rough team size you worked with. If you can deliver an early hands-on prototype within four weeks, even better.