RestAPI Development for notification system & for communication between central core unit and (mobile)app

We need a RestAPI developer for making
2 RestAPI as seen in the description/requirements here:

RestAPI 1 (Server/Communication):
RestAPI Development for Notification system

General
- RestAPI based on Python with Flask/Flask-Restful
- documentation in Postman

Purpose/Features
• Analyzing and processing of the received requests for sending notifications (Push/Mail/SMS) to certain contacts.
• List of contact data (incl. type of notification) will be handed over via payload in JSON format
• a corresponding notification shall be triggered depending on the user’s chosen notification type(s) (Push/Mail/SMS)
• for sending SMS notifications, an appropriate provider interface has to be implemented/used (provider to be used is currently in clarification)
• logging of received notification requests

RestAPI 2 (Core/Communication):
RestAPI Development for communication between central unit and app:

• RestAPI already existing, but with static/hard-coded data only.
• Developed in Python with Flask/Flask-Restful.
• Static version is documented in Postman. Documentation shall be updated accordingly.
• Requests shall be extended with dynamic logics
o writing received data to file
o reading data from files and sending them as part of the response