e-commerce · telegram mini app

Biotact

Telegram Mini App e-commerce for dietary supplements. Multicard payments with OFD fiscalization, referral system, admin panel, i18n RU/UZ.

Role

Full-Stack

Period

2025–2026

Status

Production

Biotact is a full-featured e-commerce platform for selling BIOTACT Deutschland dietary supplements, built as a Telegram Mini App.

Frontend: React 19 + Vite + Zustand + TanStack Query + Tailwind 4. Backend: FastAPI + PostgreSQL + SQLAlchemy async. Separate Telegram bot on aiogram, referral bot, and admin panel.

Payments through Multicard with full OFD fiscalization — every purchase generates a fiscal receipt. Multi-level referral system. CRM with family profiles — the bot remembers health concerns, family composition, purchase history, and AI notes per customer.

Covered by 129 tests, monitoring via Sentry, deployed on PM2 with 4 processes (api, bot, ref-bot, multicard), Nginx, Ubuntu 24.04.

Key Decisions

Telegram WebApp auth with initData HMAC-SHA256 validation

Multicard payment gateway with OFD fiscalization and receipt generation

CRM with family profiles — health concerns, purchases, AI notes per customer

129 tests, Sentry monitoring, PM2 with 4 processes in production

Tech Stack

React 19 TypeScript FastAPI PostgreSQL Tailwind 4 aiogram

Gallery

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