Telegram Bot — From Simple Commands to Mini-Apps

• Utility bots: quick commands, reminders, scheduled reports.
• Operations & support: intake forms, ticket routing, moderation tools.
• Business flows: payments, order tracking, approvals, mini-apps (WebApp).

• Aiogram for handlers + FSM for conversational flows.
• FastAPI webhooks behind reverse proxy; horizontal-friendly.
• Redis for sessions/rate limits; PostgreSQL for persistent data.
• Docker for deploys; structured logging & metrics.

from aiogram import Router, F
from aiogram.types import Message
from app.services import orders

router = Router()

@router.message(F.text.startswith("/status"))
async def status_handler(msg: Message):
  order_id = msg.text.split(maxsplit=1)[-1]
  data = await orders.get_status(order_id)
  await msg.answer(f"Order {order_id}: {data.status} • ETA {data.eta}")

• Webhook signature checks, per-user rate limiting, admin roles, audit log.
• Graceful restarts with job queues, idempotent handlers, retries with backoff.

Skills demonstrated: event-driven Python, API design, state machines, background jobs, production deploys.