• Role: Backend Developer
• Timeframe: Delivered MVP + deployment + initial support
• Platform: Telegram bot + Django admin + CRM integration
• Status: Released
• Team: Solo

Telegram chatbot for a travel agency that captures trip preferences from either free-form text/voice or a structured survey, then submits a complete lead to Bitrix24. Voice messages are transcribed with Yandex SpeechKit and confirmed by the user before submission. Bot content and survey configuration are editable via Django admin.
Key highlights:
• Two intake modes: audio/text request or multi-step survey
• Voice-to-text with confirmation loop to prevent bad leads
• Admin-controlled questions, answers, texts, and contact methods

• Leads were collected manually and inconsistently. Missing details caused back-and-forth with customers.
• Needed voice support, but STT errors can corrupt intent and waste agent time.
• Survey content had to be editable without code changes and deployable on the client’s server.

I built a state-driven Telegram bot that guides users through either free-form intent capture or a controlled survey, then collects contact method + phone number with validation. Once all required fields are present, the bot assembles a single payload and pushes it to Bitrix24 via API. Voice recognition runs asynchronously and is toggleable from Django admin.
• End-to-end flow: intake → validation → CRM submission

• Django app with webhook endpoint for Telegram updates
• Finite-state conversation engine (step / sub-step / micro-step stored per user)
• Survey engine driven by DB models (questions, ordered answers, “own option” branches)
• Voice pipeline: Telegram file download → STT (short vs long) → user confirmation
• Celery + RabbitMQ for background tasks (STT, CRM posting)
• Django admin as CMS for bot texts, keyboards, contact types, survey content
• Dockerized deployment with Postgres, worker, and web service

• Built a reliable state machine that survives restarts and handles re-tries without losing user context
• Implemented voice STT with a confirmation loop to protect lead quality
• Supported long-audio transcription via object storage + long-running STT polling
• Prevented invalid CRM payloads by enforcing strict phone validation and required-field completion
• Designed survey data model to support ordering, grid keyboards, and “custom answer” branches
• Made bot behavior configurable via admin (voice mode toggle, editable texts and options) without redeploys
• Structured async CRM delivery (sync in dev, background in prod) to keep chat UX responsive

• Standardized lead intake and ensured each lead reaches Bitrix24 with complete, structured data
• Reduced ambiguity by confirming STT results and enforcing validation before submission
• Enabled non-technical staff to update survey/questions/texts through admin

• iOS:
• Architecture:
• Backend/Infra: Python, Django, Celery, RabbitMQ, PostgreSQL, Bitrix24 API, Yandex SpeechKit, Yandex Object Storage (S3), Docker
• Tooling: Django Admin, telebot, adminsortable2, gunicorn, nginx