Костянтин

Backend Developer

Age:
21 years
City of residence:
Kyiv
Ready to work:
Kyiv, Remote

Contact information

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Work experience

No work experience.

Education

Європейський Університет

Факультет Інформаційних Систем і Технологій, спеціальність Комп'ютерні Науки 122
Higher, from 2022 to 2026 (4 years)

Knowledge and skills

  • TypeScript
  • JavaScript
  • Node.js
  • Next.js
  • NestJS
  • Express.js
  • REST API
  • PostgreSQL
  • MongoDB
  • Redis
  • TypeORM
  • Prisma
  • Jest
  • Supertest
  • K6
  • Playwright
  • Git
  • Docker
  • Postman
  • Modular Monilith
  • Здатність до навчання

Language proficiencies

English — average

Additional information

Summary
Backend Developer with no commercial experience, but hands-on experience building web applications using TypeScript, React, Next.js, and NestJS. Experienced in REST API development, PostgreSQL, MongoDB, and automated unit, end-to-end, and load testing. Familiar with Feature-Sliced Design (FSD) and Modular Monolith architecture.

Projects

E-Orenda
Team project · Invoice automation platform

- Developed and maintained a Next.js application, implementing new features and fixing bugs.
- Built responsive user interfaces and collaborated through Git, code reviews, and team discussions.
- Wrote and maintained Jest unit tests, verifying new features and bug fixes.
- Worked with MongoDB and contributed to the existing codebase.

Stack: Next.js, React, TypeScript, MongoDB, Jest, Git

Backend Performance Optimization

- Designed and implemented a REST API using NestJS and PostgreSQL.
- Improved application performance by integrating Redis caching.
- Developed automated unit and end-to-end tests with Jest and Supertest, ensuring API reliability.
- Created load-testing scenarios with k6 and improved application performance by integrating Redis caching.

Stack: NestJS, TypeScript, PostgreSQL, Redis, TypeORM, Jest, Supertest, k6

Patriot Shop
Desktop e-commerce application

- Developed a desktop full-stack application using Electron, React, and Express.js.
- Built REST APIs for authentication, products, categories, and order management.
- Implemented role-based authorization and an administrative dashboard.
- Developed end-to-end tests using Playwright.
- Worked with PostgreSQL using Prisma ORM.

Stack: Electron, React, Express.js, PostgreSQL, Prisma, Playwright

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