The Agent-Site: How I Built an Autonomous AI System on Astro + FastAPI and Manage It via Telegram

Roman. 24.12.2025

In early 2025, like many others, I was looking for a “gold mine” in AI. First I tried consulting, then wrote simple bots, and made mistakes in freelancing. But the real breakthrough happened when I stopped thinking in categories of “just a bot” or “just a website” and started building ecosystems.

For about six months, I modeled the architecture, testing everything: from o3-mini to Gemini 3 Pro combined with GPT Codex. In practice, I realized one thing: isolated solutions do not work. Website + Unified AI Module + Telegram — this is the combination that truly solves business tasks and doesn’t require a staff of managers.

Below, I’ll tell you how I got here, why I threw out the old stack, and how it all works under the hood.

1. The Problem: “We’ll Contact You” is a Failure

Let’s be honest: contact forms in 2025 are an atavism. Most often, inquiries get lost in the void. A person visits, gets interested, but has a question. What do they see? A dry form saying “Leave your phone number.” They are too lazy to fill it out, and the context is forgotten a minute later.

In the “age of impatience,” people don’t wait. If a user doesn’t get an answer instantly, they won’t wait until Monday morning. They will simply close the tab and go to a competitor who has an answer ready.

My task was as follows: Create a system that works 24/7. Not just an “auto-responder,” but a full-fledged AI Consultant that:

Remembers the context of the conversation (even 10 messages later).
Conducts a dialogue based on my knowledge base (RAG).
Gently “catches” contacts and passes them to me.

2. Architecture: Why I chose Astro + FastAPI

At first, I built a prototype on the classic stack — FastAPI + Jinja2. It worked fast, but when I wanted to add a beautiful UI and complex animations, the lags began.

In web development, you often have to choose: either “fancy and expensive” (WebGL, Glassmorphism) but the site loads for 5 seconds, or fast but looking like a greeting from 2010. I didn’t want compromises. I needed technological aesthetics — a live background, semi-transparent panels — but without white loading screens.

So I switched to Astro.

Why it works:

Astro (Frontend): Serves the page as ultra-lightweight HTML. Interactivity (“heavy” chat scripts) is loaded in isolation and only when needed.
FastAPI (Backend): Remains the “brain” of the system. It manages AI logic, queues, and the database.
Result: The site flies even on mobile internet, and search engines (AI Search) index it instantly thanks to clean code.

3. One “Brain” and Management via Telegram

I used to breed a “zoo”: one bot for Telegram, another widget for the site… It was hell to support. I decided to make one backend that works everywhere.

At the same time, I split the logic into two streams that work in parallel:

AI Consultant (RAG): Its goal is to help the user. It doesn’t “suffocate” them with questionnaires but simply answers questions based on the knowledge base I uploaded. It works 24/7 and never gets tired.
Background Parser (Observer): This is a “spy” in a good sense. It analyzes the dialogue text on the fly. If the user writes: “Can you call me at 8900…” or “Here is my nickname @…”, the system sees it. It doesn’t interrupt the dialogue but quietly forms a report.

How I see it:

Instead of a boring email saying “New Request,” I get a full dossier in Telegram:

Client’s contact.
History of correspondence (what they asked, what the bot answered).
Where they stopped.

I enter the dialogue already prepared. No “Hello, how can I help?”. I offer a solution immediately.

4. Ditching Admin Panels

I hate web admin panels. Logging in, finding the right button… I moved the entire control panel to Telegram.

It works like a constructor:

Need to change the system prompt? I write a command to the bot.
Need to update the knowledge base? I just throw a PDF file into the chat.
Need to switch the model (from o3-mini to Gemini)? I press a button in the menu.

This gives incredible flexibility. I can manage the business from my phone, from anywhere.

Summary: How It Works Right Now

You are reading this text on a site built with this exact architecture. But theory is one thing, and practice is another.

Want to test the system’s “brain”? I intentionally didn’t embed the chat in this article so you could appreciate the loading speed of the main version.

Go to the Home Page.
Click on the chat icon in the bottom corner.
Try to “break” the logic with a complex question. For example: “Suggest 3 solutions for my task” or “How do you work?”.

And if you write your contact to the bot — know that I will receive a notification in Telegram in exactly one second.

👉 Test the System on the Home Page