GameMaker Developer Needed - Simple Modular Management Game Framework

I am looking for a GameMaker developer to build a simple management game framework that can be reused for multiple themes.

The goal is NOT to create a complete game, but a generic framework that I can later customize myself into different games such as:

Horse management and breeding
Football management
Basketball management
Other sports or management themes

Required Features

Main menu
Player profile
Currency system
Generic entity system
Statistics system
Match/competition simulation system
Save and load system
Data stored in JSON files where possible
Clean and organized code

Important

The framework must NOT be hardcoded for horses, football, or any specific theme.

For example:

Entities should be configurable.
Stats should be configurable.
Competitions should be configurable.
Names and descriptions should be loaded from data files.

I want to be able to replace content and create a different management game without rewriting large parts of the code.

Not Required

Multiplayer
Online accounts
Cloud saves
In-app purchases
Advertisements
Advanced graphics
Animations
Fancy UI

Simple placeholder graphics and menus are completely acceptable.

Deliverables

Full GameMaker project files
Well-organized code
Basic documentation explaining how to add new entities, stats, and competitions

Please Include

Your GameMaker experience
Examples of previous projects
Estimated completion time

This project is intended as a foundation for future management games, so code quality and flexibility are more important than graphics.