Karol Czerwinski

Full Stack Developer

Work

  • Pioneer Legends

    Built smart contracts and led the development process for whitepaper, staking and bank.

    TypeScript Next Express MongoDB Go Web3 Solana Rust
  • Reavers

    Fix vulnerabilites in the codebase and optimized database.

    TypeScript Next Firebase Tailwind
  • Goalpost

    Led the development process of a poker platform & fixed issues in the codebase.

    TypeScript React Socket.io Node Web3 Solana
  • Artpunks

    Built unstaking smart contract and fix frontend issues.

    JavaScript React Rust Solana
  • Tombstone - Coffin

    Made smart contract and backend for lootbox game.

    Node Express Web3 Anchor Solana
  • Hoopas

    Audit NFT reveal platform, implemented staking feature.

    Typescript Node.js Express MongoDB React Anchor
  • Minerva wallet

    Joined and contributed to wallet development.

    JavaScript Kotlin Bootstrap Google Analytics SEO Nginx Ethereum
  • Katowice Airport

    Created a website that is clear, legible and easy to use.

    JavaScript PHP7 Laravel MySQL HTML5
  • Black Red White

    Made a fully responsive and multifunctinonal Flex wardrobe configurator.

    React PHP7 three.js
  • Whisbear

    Designed an application that allows users to control the toy.

    Swift Java PHP7 C++ Bluetooth
  • Vacasa

    Created a user-friendly platform for searching vacations.

    Python React HTML5 Django Sass
  • RoundRush

    Designed a workflow management system competitor of Jira, Asana, Trello and many others.

    React Javascript Golang Docker Kubernetes
  • Personal Website

    My awesome personal website.

    HTML CSS JavaScript

Hi, I'm Karol

I'm a Full Stack / Blockchain Developer from Poland.
Accomplished Full Stack Developer with 7+ years of experience.
Built and audited many smart contracts last 3 years on various networks.
Skilled in creating, testing, and deploying web applications using the latest tools and technologies.
Excellent problem-solving and communication skills.
Always try and keep the pace with the brand-new fields and dig into cutting-edge technologies.
Feel free to ask anything, I am here to help you.

Core Tech Stack
C++, C#, Rust, Golang, Java, Javascript, Python
Oracle, MySQL, PostgreSQL, MongoDB, Redis, Firebase, Supabase
Angular, Laravel, React, Next, Vue, Nuxt, Express, Django, PHP, .NET
RESTful API, GraphQL
API Development, API Integration
AWS, Azure, Google Cloud, Docker, Jira, Kubernetes
Blockchain, Solana, Near, EVM, Aptos, Polkadot, Sui
DeFi, P2E, NFT, Smart contracts