Freelance | Self-Employed

Back End Developer · 2024 — 2025

During this period I worked independently as a backend developer, building services and APIs for client projects on a freelance basis.

What I worked on

Developed backend services in NestJS (TypeScript), using modular architecture and DDD (Domain-Driven Design) approaches.
Designed and implemented REST APIs for business logic and integration with client-facing applications.
Built an authentication and authorization system:
- session-based auth (NestJS)
- social login (Google, Facebook, Telegram)
Used Redis for caching and session storage.
Deployed backend services to Hetzner, including domain and hosting configuration.
Integrated third-party APIs and services:
- payment providers (including Monobank)
- delivery services (Nova Poshta API)
Implemented payment processing logic and communication with payment providers.
Worked with PostgreSQL through Prisma ORM.

NestJS · TypeScript · PostgreSQL · Prisma ORM · Redis · Hetzner · Monobank API · Nova Poshta API