Witold Mikołajczak
From: Poland
Location: Poznań, PL
On Useme since 9 August 2022
Deals 5
SUCCESSFUL: 5
DISPUTED: 0
FAILED: 0
About me
I'm a Fullstack Developer with over 4 years of experience, specializing in building scalable and intuitive interfaces using React, TypeScript, and NestJS. I follow Clean Code principles, write unit/integration tests, and value strong communication within technical teams.
I've worked on a variety of projects: from internal tools and mobile apps to complex systems integrating OIDC, blockchain, and Vault. I'm comfortable improving existing codebases or starting from scratch.
I'm open to freelance opportunities in frontend development, API integration, or fullstack app design — and always focused on delivering clean, maintainable solutions.
Website: https://witekmikolajczak.github.io/
CV / Résumé
May 2024 - Now
Fullstack Developer
Empeiria
I develop solutions in the field of decentralized identity (SSI), building systems for issuing and verifying credentials integrated with blockchain, along with a wallet application for their management. I create web applications and npm packages
Mar 2023 - Aug 2024
Frontend Developer
CONSILIUM - JAKUB BAZYLI KOZŁOWSKI
As a Frontend Developer, I developed web and mobile applications, including integrating face analysis in Sensus AI and modernizing the HomeProfit app. I also created the Cupio AI app for stress management and improved the modniewoknie.pl website
Jun 2022 - Feb 2023
Fullstack Developer
e-ux.pro
As a Fullstack Developer, I created web and mobile applications, including an employee verification system with LinkedIn integration and the PaliPali construction material ordering app.
Apr 2022 - Jun 2022
Frontend Developer
BUSBUS sp z o.o
I created custom HTML templates and engaging animations using CSS, JavaScript, and jQuer y, focusing on intuitive UX/U I. I optimized the frontend for performance and scalability, applying best programming practices.
Portfolio
The site offers a choice of 1000 colors for blinds, shades, and pleats, allowing customers to design their own windows and professional installation by qualified Advisors.
An application that highlights strengths and supports user well-being, relationships, and job satisfaction, opening new paths to self-discovery.
End-to-End Verifiable Data Infrastructure (EVDI) enabling seamless adoption of web3 technology. Organizations can utilize secure and transparent data management.
A tool offering advice, planning tools, and expense monitoring, as well as access to exclusive discounts and offers.
A platform supporting burnout prevention and user well-being improvement.