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John R. Kosinski


A developer/architect with experience in development, leadership, and mentorship across many different areas of technology, and many different industries.

The purpose of this document is to specifically highlight my smart contract and blockchain-related experience. For a full resume, please see here


Blockchains

  • Ethereum
  • Binance SmartChain
  • Sui
  • Solana
  • Polygon
  • Avalanche
  • Tron
  • Scroll

Programming Languages

  • Solidity
  • Vyper
  • Move
  • Yul
  • Rust
  • C++
  • C#
  • Javascript/Typescript
  • Python

Web3

  • Javascript/Typescript
  • NodeJS
  • ReactJS
  • ethers
  • web3
  • solana/web3

Tools

  • Hardhat
  • Truffle
  • Echidna
  • Mythril
  • Slither
  • Unity

Experience

Current Projects 2023:*

  • Aeritas: Ensuring and attesting to the provenance of internet media using the blockchain and an attendant suite of tools (multiple chains)
  • Loadpipe: Economics in a blockchain marketplace (EVM chains)

Stream Finance

December 2022

Solidity, Javascript, Echidna, defi


[Sui/Unity Integration]

In Progress

Sui, Move, Unity, Typescript, C#

  • Deployed Token and NFTs to the SUI blockchain
  • Create a secured REST API to provide access to SUI blockchain objects
  • Integrated SUI implementation with Unity game code

Garbles Labs

November 2022 - December 2022

Solana, .NET, C#, defi

  • Created a .NET client SDK for a well-known on-chain Solana automated market maker.

AxiomSys

Technical Consultant, 2022-present

Solidity, Solana, Unity, Blockchain, Architecture, Presentation, Documentation

Senior technical consultant to a blockchain development startup.

  • Planned and estimated project packages for non-fungible and fungible token development, front-end minting and administration websites with React, and security audits of smart contracts.
  • Researched and planned the integration of fungible and non-fungible tokens with the Unity game engine back end of a well-known online meeting venue.
  • Contacted, vetted, and interviewed smart contract developers, laying the foundations for an elite international team of blockchain warriors.
  • Developed, planned, and documented a methodology for security audits of smart contracts.
  • Provided expert technical consultation during sales meetings.
  • Architected a prototype integration of NFTs and tokens with a Unity game front-end.

Krewnime NFT

Solidity, Solana, NFT

Developed NFT contracts for artist Krewnime, for Ethereum, Polygon, and Solana.

  • Developed base smart contract in Solidity using best practices and a high degree of testing.
  • Developed auxiliary contracts to service the NFT contract in Solidity.
  • Developed a Solana version of the NFT using metaplex.
  • Deployed the NFTs to Opensea and Magic Eden.

Crypto Arbitrage Algo Trading Bot

Javascript, NodeJS, ReactJS, C++, Trading, Arbitrage, Defi

Architected and developed a crypto arbitrage algorithmic trading bot.

  • Architected and planned, with input from client, requirements and specifications of arbitrage system.
  • Architected modular structure to interact with cefi exchanges such as bitfinex, bitmex, and bittrex, and defi exchanges such as binance DEX.
  • Developed and tested wildly profitable system in nodeJS with C++ extensions.

Certifications & Awards

Open Source Contributions

Articles

Other

  • Excellent Communication & Writing Skills
  • Creates Good Documentation
  • Experience in Machine Learning and Statistics
  • Strong Focus on Smart Contract Security

Non-Work Interests

  • Meditation
  • Fitness
  • Learning/Reading
  • Financial Trading & Investment
  • Travelling

Code Samples