Web APp Platform Backend Design

I'm looking for a system designer and architect to design the backend of my calling and products web application.
Someone who can create :
Requirement Specification Document
Tech stack identification and third party dependencies
High Level Architecture Diagram
Cloud Architecture Diagram
UML Diagram
Project Timelines and daily tracker
API Contract
Database Design

"High-Level Architecture Diagram - Software Architecture
High-Level Module Diagram" - Software Design
Detailed Cloud Architecture Diagram
API docs
Database Design (Entity - Relationship diagram)
Detailed UML class and methods diagram
Test cases
Techstack identification and their party dependencies
PRD and Requirement Specification Document