henryzhang

Innovative and detail-oriented Senior Blockchain Engineer with 6+ years of experience designing, developing, and deploying smart contracts and decentralized applications on EVM-compatible chains, Solana, and Cosmos SDK. Proven expertise in Layer 1 & Layer 2 architectures, DeFi protocols, cross-chain interoperability, NFT marketplaces, and secure blockchain integrations. Adept in full-stack development, cloud infrastructure, and DevOps workflows. A core contributor to mission-critical projects at Chainlink and Opensea, with a strong academic foundation from Tsinghua University.

Experience: 6 years

Yearly salary: $120,000

Hourly rate: $50

Nationality: 🇬🇧 United Kingdom

Residency: 🌏 Remote

Experience

Founding Engineer

GreenBay

2024 - 2025

Built a multi-chain decentralized payment and donation platform using EVM, Solana, and Cosmos SDK. Designed and deployed smart contracts for seamless token flow, compliance, and on-chain settlements. Integrated cloud services from IBM, AWS, and Tencent to support enterprise-grade deployments. Developed a React/Node.js dashboard for analytics, donations, and account management. Led architecture decisions and smart contract audits for maximum security and performance.

Senior Smart Contract Engineer

Chainlink Labs

2022 - 2023

Contributed to the development of Chainlink Staking v0.2, focusing on validator logic and economic security. Engineered enhancements to Chainlink VRF and Data Streams, improving reliability and randomness delivery. Collaborated on Cross-Chain Interoperability Protocol (CCIP), building cross-chain messaging contracts. Actively reviewed and optimized contracts for gas efficiency and audit readiness.

Senior Blockchain & Full Stack Developer

Opensea

2018 - 2022

Spearheaded smart contract architecture for NFT minting, listing, and trading (ERC-721 & ERC-1155). Built and maintained full-stack features using React, Node.js, and PostgreSQL. Integrated third-party wallet providers and Chainlink oracles for price feeds. Led incident response and patching for smart contract vulnerabilities and system-level issues. Mentored junior developers on smart contract standards and best practices.

Skills

blockchain

front-end

full-stack

react

smart-contract

solana

solidity

tailwind

typescript

web3js

english

Create Profile Hire Solidity Developers