Michał Mirończuk, Developer in Poznań, Poland
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Michał Mirończuk

Verified Expert  in Engineering

Blockchain Developer

Location
Poznań, Poland
Toptal Member Since
October 3, 2022

Michał is an experienced blockchain and full-stack developer with a 6-year tenure in the crypto realm. He's skilled in diverse projects like lending platforms, ICO websites, and NFT marketplace solutions. His forte lies in user-friendly interfaces using React and Next.js, smart contract creation, and ERC-721 token implementation. Michał has significantly contributed to developing token economies, DApps, and cloud applications, ensuring secure, reliable, and intuitive blockchain solutions.

Portfolio

InstaDApp
Solidity, Foundry
Veritic
Amazon Web Services (AWS), AWS Amplify, Solidity, Non-fungible Tokens (NFT)...
ChainGain
Amazon Web Services (AWS), Agile Software Development, AWS Lambda...

Experience

Availability

Full-time

Preferred Environment

Visual Studio Code (VS Code)

The most amazing...

...thing I've developed is a high-performing lending platform with a current TVL of 800 MLN$.

Work Experience

Solidity Developer | Smart Contract Engineer

2023 - 2024
InstaDApp
  • Developed a DApp Fluid lending platform with a current TVL of 800 MLN$.
  • Implemented fuzzing and invariant tests for ERC-4626 Vaults using Foundry.
  • Implemented a TWAP mechanism to check asset prices using Chainlink and RedStone oracles.
Technologies: Solidity, Foundry

Blockchain Developer

2022 - 2023
Veritic
  • Implemented ERC-721 custom tokens on the Ethereum/Polygon networks, meeting the legal requirements.
  • Engineered a smart contract marketplace with a royalty system, bolstering transactional security and functionality.
  • Successfully tested and deployed smart contracts using Truffle and Ganache, ensuring their reliability and efficacy.
  • Crafted the front end in React, improving the platform's user interface and overall user experience.
  • Devised a user-friendly smart contract management tool specifically for non-technical users, built on top of the Gnosis Safe. This innovation made blockchain technology more accessible without sacrificing security or functionality.
Technologies: Amazon Web Services (AWS), AWS Amplify, Solidity, Non-fungible Tokens (NFT), Back-end Development, Front-end Development, Full-stack Development, JavaScript, TypeScript, AWS Lambda, Ethereum, Google BigQuery, Blockchain, DevOps, APIs, Crypto, Cryptocurrency

Blockchain Developer

2021 - 2022
ChainGain
  • Implemented smart contracts for a P2P lending and borrowing platform (GainMatcher). Implemented smart contracts for staking tokens. Tested and deployed smart contracts using HardHat on Ethereum Mainnet.
  • Built a front-end React-based part using Ethers.js and used DApp libraries. Implemented the back-end part using Node.js and Amazon EC2 with AWS ELB as an infrastructure with AWS Route 53.
  • Implemented a seamless off-chain login. Automated workflows with GitHub Actions and AWS Data Pipeline service.
Technologies: Amazon Web Services (AWS), Agile Software Development, AWS Lambda, Lambda Functions, Solidity, Ethereum, Node.js, JavaScript, TypeScript, AWS Deployment, Blockchain, AWS SDK, Cloud, AWS DevOps, React, Next.js, Back-end, Ethers.js, APIs, Crypto, Cryptocurrency, Utility Tokens, Decentralized Finance (DeFi), ERC-20

Blockchain Developer

2020 - 2022
Blocksism
  • Implemented ERC-721/BEP-721 token on the Binance Smart Chain network. Implemented a smart contract marketplace with a royalty system for the ERC721/BEP-721 token. Tested smart contracts. Deployed smart contracts using Truffle, and Ganache.
  • Involved in building a front-end React part using the Web3.js library.
  • Created the Hyperledger Fabric blockchain architecture for the client's needs. Implemented smart contracts in Node.js. Deployed network to an Amazon-managed blockchain service. Integrated smart contracts data with Hyperledger Explorer.
Technologies: Amazon Web Services (AWS), AWS SDK, AWS Deployment, AWS DevOps, AWS Lambda, Blockchain, Cloud, Hyperledger Fabric, JavaScript, TypeScript, React, Next.js, Solidity, Ethereum, AWS Key Management Service (KMS), Web3.js, Back-end, Sequelize, Express.js, Ethers.js, APIs, Crypto, Cryptocurrency, Utility Tokens, Decentralized Finance (DeFi), ERC-20

Blockchain Developer

2020 - 2022
Mysa Finance Startup
  • Won the AIBC Malta Summit 2021 (The team was selected from among 500 submitted projects). Carried out the fully legal tokenization of real estate in line with the guidelines of EU law.
  • Developed a token economy. Built cloud apps AWS Amplify, AWS AppSync, Lambda Functions, Amazon DynamoDB, Amazon S3(AWS S3), QLDB, Amazon Cognito, Secrets Manager, and Amazon CloudFront CDN. Implemented a seamless login with custodial wallets.
  • Implemented Solidity smart contracts. Implemented DApps using Hedera Hashgraph, SDKs, Hedera Token Service, and smart contracts. Tested and deployed Solidity smart contracts using Hardhat.
  • Involved in building front-end Next.js parts using Ethers.js, hethers, and the Hedera SDKs library.
Technologies: Amazon Web Services (AWS), Cloud, Solidity, Smart Contracts, Blockchain, Ethereum, Security, JavaScript, TypeScript, Node.js, AWS Lambda, Lambda Functions, React, Next.js, Hedera Hashgraph, AWS SDK, AWS DevOps, AWS Deployment, Back-end, Ethers.js, APIs, Crypto, Cryptocurrency, Utility Tokens, ERC-20

Blockchain Developer

2020 - 2021
Art_Value
  • Implemented smart contracts with deposits and ERC-721 tokens on the Ethereum network (Solidity). Tested smart contracts. Deployed smart contracts using Truffle and Ganache.
  • Involved in building front-end React sections using the Web3.js library. Integrated a seamless custodial Portis wallet for user authentication and management.
  • Implemented the back-end part using the NestJS framework with TypeScript. Automated the workflow with GitHub Actions.
Technologies: Node.js, JavaScript, TypeScript, Smart Contracts, Ethereum, React, Solidity, Back-end, Ethers.js, APIs, Crypto, Cryptocurrency

.NET Developer

2019 - 2020
Thinq
  • Involved in building an SEO management system using Google Ads and Google Adwords.
  • Built software solutions using the .NET Framework and Visual Studio and Microsoft Team Foundation Server. Implemented RESTful APIs.
  • Integrated Google Ads and Google Adwords. Designed, built, and optimized relational databases (MSSQLCE Server). Made programming documentation using Confluence.
Technologies: C#, .NET, Back-end, APIs

GainMatcher

Developed a simple and robust flexible financial product.

GainMatcher is a peer-to-peer lending and borrowing service that allows you to get matched with a lender or borrower:

• You chose your role: lender or borrower
• Your set your terms or match an existing offer
• You sign the contract once your offer is accepted
• You earn interest or use your borrowed capital for your needs.

BlockRecon

https://www.blocksism.com/blockrecon-bank-reconciliation-blockchain/
The project aimed to create a prototype of a system for banks that would confirm the correctness of the balance presented on accounting accounts and transactions in individual banks based on blockchain.

ArtTech Ethereum Auction Platform

https://www.blocksism.com/arttech-ethereum-auction-platform/
The project aimed at tokenizing works of art using ERC-721 and ERC-20 tokens on the Ethereum network and distributing them using the auction platform that takes advantage of smart contracts.

The client needed to tokenize the works of art with assigned numbers. To introduce works of art into the blockchain world, the client decided on an auction platform to use smart contracts to create ERC-721 (in the future ERC-20) tokens on the Ethereum network and transfer them to winning bidders. The system took a hybrid form (blockchain and server connection) to reduce the costs associated with each auction transaction (customer requirement).
2020 - 2021

Master's Degree in Computer & Systems Sciences

Stockholm University - Stockholm, Sweden

2016 - 2020

Bachelor's Degree in Computer Science

University of Technology Poznań - Poznań, Poland

JUNE 2021 - JUNE 2024

CHFD: Certified Hyperledger Fabric Developer

The Linux Foundation

Libraries/APIs

Node.js, React, Web3.js, AWS Amplify

Tools

AWS SDK, AWS Deployment, AWS Key Management Service (KMS), Sequelize

Languages

JavaScript, TypeScript, Solidity, C++, C#

Frameworks

Next.js, .NET, Express.js

Platforms

Visual Studio Code (VS Code), Ethereum, Blockchain, Docker, Amazon Web Services (AWS), AWS Lambda, Hyperledger Fabric, Hedera Hashgraph

Paradigms

Agile Software Development, DevOps

Other

Smart Contracts, Non-fungible Tokens (NFT), Security, Back-end, Ethers.js, APIs, Crypto, Cryptocurrency, ERC-20, Web3, Web Security, Cloud, Lambda Functions, AWS DevOps, Decentralized Finance (DeFi), Fintech, Back-end Development, Front-end Development, Full-stack Development, Google BigQuery, Utility Tokens, Foundry

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