Michał is available for hire
Hire MichałMichał Mirończuk
Verified Expert in Engineering
Blockchain Developer
Poznań, Poland
Toptal member since October 3, 2022
Bio
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
- JavaScript - 5 years
- Node.js - 5 years
- Smart Contracts - 4 years
- Blockchain - 4 years
- Solidity - 4 years
- React - 3 years
- Amazon Web Services (AWS) - 2 years
- Hyperledger Fabric - 2 years
Availability
Part-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, Ton
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
Experience
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.
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
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).
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).
Education
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
Certifications
JUNE 2021 - JUNE 2024
CHFD: Certified Hyperledger Fabric Developer
The Linux Foundation
Skills
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#
Platforms
Visual Studio Code (VS Code), Ethereum, Blockchain, Docker, Amazon Web Services (AWS), AWS Lambda, Hyperledger Fabric, The Open Network (TON), Hedera Hashgraph
Frameworks
Next.js, .NET, Express.js
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, FunC, Ton, Back-end Development, Front-end Development, Full-stack Development, Google BigQuery, Utility Tokens, Foundry
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