Roblox Script for my project

I am looking for an experienced Roblox scripter to improve and extend my existing script. The base script is already in place, but several important features need to be added or fixed:
1. Inventory System:
• Weapon selling is already implemented, but a proper inventory system is missing and must be integrated.
2. Vehicles:
• Vehicles are already included in the game. They need to be enabled in a garage and made drivable.
3. Ingame Shop:
• The shop is already set up in the script, but purchases stop after “Transaction started” and do not complete. The buying process must be fixed and fully functional.
4. Multilanguage Support:
• The script should automatically translate into different languages (the plugin is already available and just needs to be enabled/integrated).

Requirements:
• Strong experience with Roblox Studio and Lua scripting
• Knowledge of Gamepasses/Developer Products (Ingame purchases)
• Experience with UI and translation plugins is a plus

Goal:
A fully functional Roblox script with an inventory system, drivable vehicles, a working ingame shop, and automatic multilanguage support.