Telegram Auto-Join Bot Development

I want a small service that can take one (or many) Telegram account sessions, start a bot from that very same session, and immediately make the account join a channel I specify. After joining, the account does not have to post or listen for anything—the goal is simply to be inside the channel.

Key points I must have
• Multi-session handling so I can feed in a list of account strings or .session files and process them in bulk.
• A clean way to point each session at the target channel (username or invite link) before execution.
• The code should run reliably whether I spin it up on Windows or Linux servers.
• No extra in-channel interaction is required; once the join is confirmed the job for that account is done.

Please use a well-supported library such as Python’s Telethon, Pyrogram, or an equivalent in Node.js if you prefer—whatever gets the job done quickly and can be maintained. I will need full source code, a short README explaining how to prepare/export sessions, and a simple success log so I know which accounts have joined.

If you have done similar bulk Telegram automations before, let me know; otherwise outline the tech stack you intend to use and how you will handle Telegram’s rate limits for multiple sessions.