Backend Engineer (Python)
Digital commodity trading platform connecting grain traders, logistics providers and financial partners. Lean team, AI-native development practices.
- Top contributor to the codebase (84%). Designed the system architecture, drove technical decisions and shaped engineering processes while shipping the product from an early stage to production.
- Built universal OAuth 2.0 authentication (Google, LinkedIn, Meta) in-house, replacing Auth0 and its paid subscription.
- Logistics module: transport management, waybill (TTN) documents, driver tracking with Google Maps, Telegram bot for drivers.
- Auction system: orders, bidding, counter-offers and templates. Dashboard analytics on SQL/CTE queries with multi-currency aggregation.
- Document automation: PDF generation with digital-signature verification, Excel parsing for bulk imports.
- Own the data layer: schema design and Alembic migrations on async SQLAlchemy 2.0, N+1 elimination and load testing on multi-million-row datasets.
- Platform: WebSocket notifications, Odoo ERP, S3 and Google Maps integrations, Docker, Prometheus, background workers, CI/CD. RAG-powered AI assistant for platform management on LangChain.
- Python
- FastAPI
- PostgreSQL
- SQLAlchemy 2.0
- Alembic
- Pydantic v2
- LangChain
- WebSocket
- OAuth 2.0
- Docker
- Prometheus
- DigitalOcean
- S3