Serhii Dobrovolsky

Professional Experience

• Development and maintenance of backend applications using Python, Django, Django REST Framework (DRF), FastAPI, and Flask

• Designing, developing, and optimizing REST APIs, including integration with third-party services and external APIs

• Building applications using PostgreSQL, MySQL, SQLite, Redis, and Celery

• Database design, ORM development, migrations, SQL query optimization, indexing, and performance tuning

• Refactoring, maintaining, and extending existing (legacy) applications

• Developing asynchronous services using asyncio, WebSockets, and background task processing

• Deploying and maintaining production environments using Linux, Docker, Docker Compose, Gunicorn, and Nginx

• Cross-platform application development with Flutter

• Development of iOS applications (Swift) for PTZ camera and Matrix Switcher control

• Development of cross-platform desktop applications using Python (PyQt5/6)

• Development of enterprise business applications using Python, Django, FastAPI, MySQL, and PostgreSQL

Technical Skills

• Programming Languages: Python, Dart, Swift, Delphi, C#, C/C++

• Backend: Django, Django REST Framework (DRF), FastAPI, Flask

• API Development: REST API, WebSocket, OpenAPI (Swagger), JWT, OAuth2

• Databases: PostgreSQL, MySQL, SQLite, Microsoft SQL Server, MongoDB

• ORM & Validation: Django ORM, SQLAlchemy, Pydantic

• Caching & Background Processing: Redis, Celery

• Testing & Code Quality: pytest, mypy, Ruff, Black

• DevOps: Docker, Docker Compose, Linux, Gunicorn, Nginx

• Frontend & Desktop: Flutter, PyQt5/6

• Mobile Development: Swift (iOS)

• Version Control: Git

• AI & LLM: OpenAI API, OpenRouter, LangChain, RAG, Vector Databases, Embeddings