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Andrii Kunytskyi

Lead Developer

Senior Frontend Developer with four years of experience architecting and scaling enterprise-grade React SPAs, specializing in complex component systems, REST API integration, and production debugging while leading framework migrations and microservice contributions.

Experience

  1. Lead Developer

    Jun 2024 — Present

    Polish Agency for Enterprise Development (PARP)

    • Designed and implemented React SPA modules for complex forms, administrative views, and data-heavy tables using REST API integration while adhering to a Material UI-based design system.
    • Diagnosed and resolved production stability issues and optimized performance of critical views through React DevTools profiling, re-render reduction, memoization, and lazy loading.
    • Collaborated with backend engineers to refine REST API contracts, reducing frontend workarounds and improving maintainability.
    • Led migrations from React 16 to 19 and from Create React App to Vite/Vitest, enhancing build performance and test coverage.
    • Resolved a stability issue in large-form PDF generation during the React 17→18 migration, ensuring seamless UI functionality.
    • Maintained and extended a PDF-generation microservice end-to-end (API, microservice, UI) for over two years, currently adding DOCX support.

  2. Senior Developer

    Oct 2023 — May 2024

    Polish Agency for Enterprise Development (PARP)

    • Designed and developed React SPA modules for complex forms, administrative dashboards, and data-heavy tables using REST API integration while adhering to a Material UI-based design system to optimize usability and development efficiency.
    • Diagnosed and resolved production performance bottlenecks in critical application views through React DevTools profiling, implemented re-render reduction techniques, and applied memoization and lazy loading to improve responsiveness.

  3. Frontend Developer

    May 2023 — Sep 2023

    Polish Agency for Enterprise Development (PARP)

    • Designed and developed React SPA modules for complex forms, administrative views, and data-heavy tables with REST API integration, applying UI/UX decisions within a Material UI-based design system.

  4. Senior IT Specialist

    Oct 2022 — Apr 2023

    Polish Agency for Enterprise Development (PARP)

    • Designed and maintained unit and integration tests for React components using Jest, Vitest, and React Testing Library to ensure test coverage and reliability.
    • Extended the GitLab CI/CD pipeline to automate test execution, improving release stability and minimizing regression risks.
    • Collaborated with backend engineers to refine REST API contracts for consistency and maintainability.
    • Conducted code reviews to enforce architectural best practices and long-term maintainability.

  5. IT Specialist

    Mar 2022 — Sep 2022

    Polish Agency for Enterprise Development (PARP)

Skills

Tool

  • REST API
  • Vite
  • Chrome DevTools
  • Material Design
  • Backend
  • Frontend
  • Workflow

Framework

  • React
  • Jest
  • Redux
  • Node.js
  • React Hook Form
  • Symfony

Devops

  • GitLab CI/CD

Other

  • React Testing Library
  • Vitest
  • Context API
  • React Router
  • RWD
  • Styling / UI
  • Testing

Methodology

  • Scrum

Design

  • CSS
  • Sass

Programming language

  • JavaScript
  • TypeScript

Education

  • Other

    Go-IT School

  • Computer Systems and Networks

    Zaporizhzhia University of Economics and Information Technology