Chatbot Builder Platform Development

I'm seeking a full-stack developer to create a chatbot builder platform specifically designed for a specific sector, similar to Fastbot (https://fastbots.ai/)

Key Features:

1. Possibility to train the chatbot with various sources similar to Fastbot incl. a crawler
2. Possibility for our clients to embed the trained bot into their websites
3. Possibility to monitor the responses and end-user satisfaction of the bot to be able to train and tune AI - AI-anonymized end users of our clients
4. Compliance with GDPR
5. Our clients are in a conservative sector and we do not want to be fancy with UX/UI - focus on client experience and functionality, and UX/UI quality similar to Fastbot.ai suffice.

Excluded Features:

1. Functionality to choose LLM engine in the platform - only default integration to one commercial LLM
2. No need for appearance adjustment of the bot
3. No need for a website to sell this bot/platform - we have our distribution channel

Ideal Skills and Experience:

- Fullstack software developer with experience in developing chatbot platforms and integration to commercial LLMs
- A software developer with a good command of English, time management and communication skills

Please DM me your bids incl. the information below

1. Proposed software stack and architecture (visual illustration preferred)
2. Total estimated cost and time associated (range, hours & EUR) incl.
2.1) Breakdown of the estimated cost and time associated (range, hours & EUR) with front- and back-end tasks
2.2) Breakdown of the main tasks, on the back and front end sides, and their associated time and cost (range, hours & EUR)