Artem

Artem Zaporozhchenko
Python Backend & AI Engineer
Mykolaiv, Ukraine
[open contact info](look above in the "contact info" section)
[open contact info](look above in the "contact info" section)
Telegram: @aaz_dev

SUMMARY
Backend Engineer with 3 years of commercial experience in Python backend development. Focus on FastAPI, asyncio,
PostgreSQL, and LLM integrations. Experience building async microservices, RAG pipelines with pgvector, background
processing systems with Celery/Redis, and optimizing database queries.

SKILLS

- Languages & Core: Python 3.11+, FastAPI, asyncio, Pydantic v2, WebSockets, Celery, HTTPX, Aiogram 3.x
- Databases & Cache: PostgreSQL, pgvector (HNSW), Redis, Async SQLAlchemy 2.0, Alembic
- AI & Search: LangGraph, RAG architectures, OpenAI API, Local Embeddings, Whisper
- DevOps & Tooling: Docker, Docker Compose, Linux/Bash, uv, Poetry, Git, Loguru
- Testing & Security: Pytest, pytest-asyncio, Unit & Integration tests, JWT, Argon2, RBAC

EXPERIENCE

Python Backend & AI Engineer

Tech Consulting & Development | Oct 2024 – Present

- Developed async FastAPI microservices handling real-time WebSocket communication and concurrent client
requests.
- Built RAG and multi-agent pipelines using LangGraph, integrating OpenAI API with semantic search in
PostgreSQL using the pgvector extension and HNSW indexing.
- Offloaded CPU-bound and media-processing tasks to background queues via Celery and Redis to keep the event
loop non-blocking.
- Optimized SQL queries and table schemas in PostgreSQL, using EXPLAIN ANALYZE to identify slow scans and
add missing indexes.
- Created multi-stage Docker builds to reduce container size and improve deployment speed.
- Covered core business logic and API endpoints with unit and integration tests using pytest-asyncio.
- Containerized the service, database, and Redis cache using Docker Compose.

Python Backend Developer

Digital Product Agency | Jul 2023 – Sep 2024

- Built RESTful APIs using FastAPI and asynchronous SQLAlchemy 2.0, managing migrations with Alembic.
- Implemented JWT authentication (PyJWT, Argon2) and role-based access control (RBAC) for API endpoints.
- Built WebSocket-based state management with Redis for real-time room sessions and interactive multi-user
tools.
- Developed asynchronous web scrapers and parsers using HTTPX, Playwright, and BeautifulSoup4 with proxy
rotation and retry logic.
- Configured Docker Compose setups for development and staging environments, adding structured logging with
Loguru.