Experience

• Senior Fullstack Developer — Fiege sp. z.o.o2025–now

  I work on an organization management system built with React, Nest.js, PostgreSQL, and Redis: designing and developing microservices, refactoring architecture, and building REST APIs with Nest.js, Prisma, and PostgreSQL. I migrate data from legacy systems and contribute to design systems using Storybook, React, blueprints, and templates. I also set up jobs, pipelines, and CI/CD solutions.

• Fullstack developer — Metagravity2024–2025

  Integrating a Web3 application with Next.js and Wagmi, updating contracts(hardhat, ethers.js). Working with Azure, CI/CD, and Terraform DevOps tools and services. Node.js and Rust backend development. Integrating Immutable passport and creating requests for zkvem contracts functions with Next.js and Wagmi, deploying and configuring Ethereum and Immutable zkvem contracts using etherjs and Hardhat. Implementing the Persona KYC solution into the Next.js apps.

• Fullstack developer — G-Group.dev2022–2024

  Developing Next.js and React applications/pages with Node.js, React Native mobile apps, and Angular. Conducting technical recruitments in the area of React.js and JavaScript.

• Fullstack developer — LoudNow agency/Digital Surgeons2021–2022

  Developing high-performance webpages mostly on Nuxt.js + tailwind on the frontend and Lando + CraftCMS on the backend stack. Working with e-commerce solutions - liquid Shopify and twig templates + JS scripts to animate sliders, scrolls, etc.

• Self-employed(freelancer) — Wiktor Kujawa2019–2021

  Web projects, applications, mockups, chatboxes, form generators, mostly with node.js and React, Vue or Angular, and other frameworks like Svelte or Riot.js and js or Matlab algorithm scripts for individual clients or with Upwork. Review of science/power/electrical engineering papers + Python/Matlab calculations on Kolabtree.

• R&D engineer — Eltel Networks Energetyka S.A. Olsztyn2018–2019

  One year of full-time job during which I improved software(C/C++) and tutorials written before and created new ones, modeled cables and prepared simulations of actual branch projects using CYMCAP, teach other staff members CYMCAP and learned others CYME software, wrote technical specifications, create documentation of projects and used my created software in solving actual branch projects.

• R&D technician — Eltel Networks Energetyka S.A. Olsztyn2017–2017

  Two-month internship during which I researched CYMCAP and wrote brief tutorials for other staff members and wrote software for calculating EM fields, Inducing voltages, etc... Studied thermal phenomena of underground cables in the surrounding of different types of soil layers.