Janek

janek26

web3 • open source • building for impact

Building for a greater good

I build infrastructure and libraries for web3 and beyond. My focus is on open source solutions that empower developers and advance the ecosystem.

Open Source

Web3 Dev

Libraries

Extensions

Impact Driven

Full Stack

Featured Work

Projects I've initiated, developed, and contributed to

Argent X

Core Developer & Contributor

Wallet Infrastructure

Self-custody wallet for Starknet with advanced security and user-friendly interface.

StarknetTypeScriptReactOpen Source

Vesu.xyz

First Developer & Full-Stack Engineer

DeFi Protocol

Innovative DeFi infrastructure powering the Starknet ecosystem.

DeFiStarknetSmart ContractsFull Stack

starknet.js

Maintainer & Core Contributor

Core Library

The JavaScript/TypeScript standard library for interacting with Starknet. Used by thousands of developers.

StarknetTypeScriptLibraryOpen Source

viem

Contributor

Web3 Library

Contributing to the modular and performant Ethereum library for modern TypeScript development.

EthereumTypeScriptWeb3Open Source

Rainbow Browser Extension

Developer

Browser Extension

Browser extension providing seamless wallet integration and blockchain interaction.

ExtensionWeb3UXBrowser APIOpen Source

Speaking & Events

sharing knowledge at major web3 and developer conferences

Building Web3 Tools That Matter

StarknetCC

StarknetCC is the largest community conference in the Starknet ecosystem, bringing together builders, developers, and enthusiasts to explore Cairo and Starknet innovation.

StarknetWeb3Cairo

Web3 Development with Starknet.js

App.js

App.js is the largest JavaScript event in Europe, bringing together thousands of developers. Sharing insights on modern web3 development and JavaScript tooling.

JavaScriptWeb3TypeScript

About Me

I'm a senior developer passionate about building open-source infrastructure and products for the web3 ecosystem. With expertise spanning full-stack development, extension development, and library design, I focus on creating developer tools that are both powerful and delightful to use.

My journey in web3 started early, and I've been fortunate to work on foundational projects like Argent X, Vesu, and starknet.js. I believe in the power of open-source and contributing to projects that push the boundaries of what's possible.

Currently available for freelance work and consulting. I specialize in Web3 architecture, TypeScript libraries, smart contract integration, and full-stack development.

Focus Areas

  • ✓ Web3 & Blockchain Development
  • ✓ TypeScript Libraries & Frameworks
  • ✓ Full-Stack Engineering
  • ✓ Browser Extension Development

Available For

  • ✓ Freelance Projects
  • ✓ Consulting & Architecture
  • ✓ Open Source Contributions
  • ✓ Technical Mentoring