Mariusz Niedzielski

Frontend Developer / Automation Tester

Profile

About Me

Frontend Developer and Automation Tester with 2 years of experience in building modern web applications and test automation. Specializing in Next.js, TypeScript, and Tailwind CSS. Experience in the full software development cycle – from manual and automated testing, through Product Owner role, to frontend development. Practical knowledge of Agile methodologies (Scrum/Kanban) and collaboration in development teams.

Experience

Soltix Sp. z o.o.
Zielona Góra, Lubuskie, PL
Frontend Developer / Automation Tester
04.2025 - Present

Development of web applications for the rental industry using Next.js, TypeScript and Tailwind CSS

  • Development of web applications for the rental industry using Next.js, TypeScript and Tailwind CSS
  • Implementation of responsive user interfaces with focus on UX and performance
  • Writing unit tests in Jest and end-to-end tests in Cypress
  • Creating landing pages and marketing components
  • Collaboration in development team using Scrum methodology
  • Code review and application performance optimization
GAMP Sp. z o.o.
Zielona Góra, Lubuskie, PL
Automation Tester / Product Owner
03.2024 - 04.2025

Test automation and product management of ERP application serving agricultural commodity exchange

  • Creating and maintaining automated tests for ERP application
  • Manual testing of reservation and parking system
  • Serving as Product Owner in general assembly organization application project
  • Writing E2E and unit tests
  • Product backlog management and functional requirements definition