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Yurii Khyzhniak, Senior Web3 / Frontend Engineer
Yurii Khyzhniak
🇺🇦Ukraine (UTC-08:00)
Created AtUpstaffer since January, 2026
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Yurii Khyzhniak — Senior Web3 / Frontend Engineer

Expertise in Front-End Web (4.0 yr.), Blockchain and Cryptography (4.0 yr.).

Last verified on January, 2026

Core Skills

Next.js
Next.js
TypeScript
TypeScript
5 yr.
JavaScript
JavaScript
5 yr.
Node.js
Node.js
5 yr.
React
React
5 yr.

Bio Summary

Software Engineer with 4 years experience, including FAANG tenure, excels in Web3, blockchain, and frontend technologies. Spearheaded development of high-traffic React and Next.js applications, enhancing performance metrics by 35%. Pioneered end-to-end decentralized solutions encompassing DeFi and NFT domains with strong proficiency in EVM, Solidity, and full-stack Web3 practices. Recognized for applying FAANG engineering standards to startup ecosystems, ensuring scalable and maintainable code. Holds a Bachelor's in Computer Science from Lviv Polytechnic National University, demonstrating a robust foundation in technical academia and a commitment to rigorous engineering methods.

Technical Skills

Programming LanguagesJavaScript, TypeScript
JavaScript FrameworksNext.js, Node.js, React
Databases & Management Systems / ORMPostgreSQL, relational databases
UI Frameworks, Libraries, and BrowsersShadCN
Amazon Web ServicesAWS DevOps
BlockChain and Decentralized SoftwareIPFS (InterPlanetary File System)
SDK / API and IntegrationsRESTful API
Methodologies, Paradigms and PatternsScrum
Mail / Network Protocols / Data transferWebRTC
Other Technical SkillsBackend, InterPlanetary File System, Teamwork, WAGMI

Work Experience

Senior Frontend / Web3 Engineer, Large-scale React and Next.js Applications

Duration: Sept 2019 – Sept 2025
Summary:

  • Developed and scaled React and Next
  • js applications used by millions of users
  • Improved Core Web Vitals and frontend performance by 35%
  • Built reusable component systems and frontend architecture
  • Collaborated with distributed teams across multiple time zones
  • Mentored junior engineers and performed code reviews

Responsibilities: Frontend scaling and performance optimization, component system development, architecture design, team collaboration, mentorship, code reviews.
Technologies: React, Next.js
Web3 Engineer, DeFi and NFT Decentralized Applications

Duration: Sept 2025 – Present
Summary:

  • Delivered DeFi and NFT-based decentralized applications end-to-end
  • Integrated MetaMask, WalletConnect, and smart contract interactions
  • Consumed on-chain and off-chain APIs for real-time dashboards
  • Worked directly with founders and stakeholders in fast-paced environments

Responsibilities: Full DeFi and NFT dApp development, smart contract integration, API consumption, client liaison.
Technologies: MetaMask, WalletConnect, Smart Contracts
Web3 Engineer, DeFi Analytics Dashboard

Duration: Project Specific
Summary:

  • Multi-chain DeFi dashboard with wallet portfolio tracking
  • Built with React, Next
  • js, Ethers
  • js, and Tailwind CSS
  • Real-time on-chain data visualization

Responsibilities: DeFi dashboard development, wallet tracking, on-chain data visualization.
Technologies: React, Next.js, Ethers.js, Tailwind CSS
Web3 Engineer, NFT Marketplace

Duration: Project Specific
Summary:

  • NFT minting, listing, and wallet authentication
  • Solidity smart contracts + React frontend
  • IPFS integration for decentralized storage

Responsibilities: NFT minting and listing development, wallet authentication, smart contract and frontend integration, decentralized storage with IPFS.
Technologies: Solidity, React, IPFS
Web3 Engineer, Token Staking dApp

Duration: Project Specific
Summary:

  • ERC-20 staking and rewards distribution
  • Smart contract security best practices
  • Full-stack Web3 implementation

Responsibilities: Token staking dApp development, rewards distribution mechanism, smart contract security enhancement, full-stack Web3 integration.
Technologies: ERC-20, Smart Contracts, Full-stack Web3
Education

  • Bachelor’s Degree in Computer Science
    Lviv Polytechnic National University

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Yurii Khyzhniak, Senior Web3 / Frontend Engineer
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