Multithreaded Python Telegram Bot Enhancement

I have a working Python code for a Telegram bot, but my current setup only allows one broadcast at a time. I am seeking an experienced Python programmer who can expand its functionality to handle multiple broadcasts simultaneously.

Key tasks involved:
- Modifications to existing Python script to allow multi-threading.
- Ensure the bot's performance isn't compromised due to the enhancement.
- Complete debugging post modifications.

Ideal Candidate:
- Wide-ranging experience with Python.
- Solid background in handling telegram bots.
- Exposure to multi-threading concepts.

I am looking for a rapid implementation, you should be able to start as soon as possible. Please include your estimated timeline to complete these modifications in your proposal.