Python Developer for aligorithm that shortens characters

I'm seeking a seasoned Python professional to develop a mobile application that abbreviates characters into a short form. This project is not just a one-off, but a long-term collaboration prospect.

Key requirements:
- Develop a mobile app GUI
- Ensure the app can convert short form characters back to long characters
- Create a publicly accessible frontend

Ideal skills:
- Proficient in Python and web development
- Expert in GUI design
- Experienced with APIs
- Knowledgeable in encryption and decryption algorithms

Please note:
- I will provide more details once we reach an agreement
- No brokers or middlemen, please. Only genuine developers allowed.