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  1. Freelancers

Bohdan Kaliushyk

Offer Bohdan work on your next project.

Poland Poland
1 month 19 days back
Available for hire available for hire
on the service 1 month 23 days
  • websockets
  • sqlalchemy
  • Alembic
  • Postman
  • OAuth 2.0 / JWT / Passport
  • telegram python bot
  • Redis / PostgreSQL / MySQL
  • Docker / Docker compose
  • REST API
  • python
  • fastapi
  • Swaggeer
Freelancer Bohdan K. — Poland. Core skill — Python, Databases & SQL

Rating

Successful projects
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Average rating
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Rating
158
Python
1568 place out of 4464
Databases & SQL
455 place out of 1205

Language proficiency level

Polski Polski: fluent
Українська Українська: fluent
Русский Русский: fluent
English English: intermediate

Skills and abilities

Programming

Services

Administration


Translation

Portfolio


  • Realtime Chat API

    Python
    Production-ready real-time chat backend built with FastAPI, WebSockets, Redis pub/sub, PostgreSQL, and Docker. Every message is saved to PostgreSQL, published to a Redis channel, and instantly delivered to all connected WebSocket clients. Supports horizontal scaling across multiple app instances. Features JWT authentication with access and refresh tokens, bcrypt hashing, and token-based WebSocket authorization. Built on Clean Architecture and Unit of Work pattern. Covered with Pytest unit and integration tests.

  • Backend System – Online Shop API

    Python
    Production-ready e-commerce backend built with async FastAPI and PostgreSQL. Features JWT authentication, bcrypt password hashing, Redis caching, and balance and transaction management logic. Complex ORM relations: One-to-Many (Client to Orders, Transactions), Many-to-Many (Client to Products, Order to Products). Built on Clean Architecture and Repository and Service pattern with strict API-to-database layer separation. Covered with Pytest unit and integration tests. Deployed via Docker Compose.