Mobile Client Development for PC MMORPG

I am looking for an experienced developer or team to create a mobile client (Android first, iOS later) for an existing PC MMORPG.

The game is based on a classic MMORPG architecture similar to Metin2.

The backend/server already exists on PC. The goal is to develop a new mobile client that communicates with the existing server protocol.

Requirements
Strong experience with Unity (preferred) or Unreal Engine
Experience developing Android games
Experience with networking (TCP/UDP, custom protocols)
Experience with 3D character animation
UI development for mobile devices
Performance optimization for low and mid-range Android devices
Knowledge of importing existing game assets (models, animations, textures)

Nice to Have
Experience with MMORPG development
Experience reverse-engineering or implementing custom game protocols
Experience with Metin2 or similar MMORPGs
Experience with cross-platform development (Android + PC)

Scope
The mobile client should include:
Login & character selection
Character movement using virtual joystick
Camera controls
Combat system
NPC interaction
Inventory
Equipment
Skills
Chat
Quests
Rendering existing maps and assets
Communication with the existing game server
Guilds
Marketplace
PvP
Mounts
Pets
Advanced UI improvements

Important
If you have already worked on a Metin2 mobile client or a similar MMORPG project, please include:
Portfolio
Screenshots
Videos
GitHub
Previous work
Estimated timeline

Please also explain which engine you recommend (Unity or Unreal) or maybe more easy port straight to the phone and why.