System Architecture Documentation for Developer Onboarding

I'm looking for an expert to prepare comprehensive system architecture documentation. The primary purpose of this documentation is to facilitate developer onboarding.
detailing on (better world org)
Key requirements for the project include:

- Creating high-level architecture diagrams that illustrate the overall system design
- Providing detailed component descriptions that explain the function and role of each system element

The ideal candidate for this project should have:

- Extensive experience in system architecture documentation
- Ability to present complex information in a clear, concise manner
- A background in software development, to understand the needs of new developers