upWork Web-service + need specification/backlog

Interested of your project
More 4 years experience with PHP Web-interfaces and services, API development and database admin systems
Portfolio - http://it.ikiev.biz/orders/plist/all/all
Last big project - https://moow.life/en/?where=kiev
My LinkedIn - https://www.linkedin.com/in/alex-torrison-50636232
Skype - alex_xandr

For easy development we need to make 3 steps:

- Prepare clear specification (Product Backlog)
- Make first prototype
- Product finalization