rizwanhameed

Senior Blockchain Developer

Experienced and results-driven Senior Blockchain Developer with 5+ years of expertise in developing and deploying DApps and smart contracts across multiple blockchain platforms including Ethereum, Solana, BSC, and Polygon. Proficient in Solidity, Rust, Web3.js, Ethers.js, and frameworks like Hardhat and Truffle, with a strong focus on security, scalability, and gas optimization. Demonstrated success in building end-to-end blockchain solutions in DeFi, NFT, and Web3 ecosystems, while collaborating with cross-functional teams in agile environments.

Experience: 5 years

Yearly salary: $48,000

Hourly rate: $25

Nationality: 🇵🇰 Pakistan


Experience

Senior Blockchain Developer
Blockchain Studioz
2020 - 2022
Spearheaded the development of cross-chain NFT marketplaces with advanced features like lazy minting, royalty management, and IPFS-based metadata storage across Ethereum, BSC, and Polygon networks. Engineered enterprise-grade smart contract systems for token launches (ERC-20, ERC-721, ERC-1155), token vesting, and crowdsale contracts with integrated access control, KYC/AML layers, and gas-efficiency optimization. Led internal audits and security reviews of mission-critical smart contracts, identifying vulnerabilities (reentrancy, overflow, front-running) and implementing best practices aligned with CertiK and Trail of Bits standards. Guided junior developers and conducted technical code reviews, setting up internal development standards and reusable smart contract libraries to accelerate project delivery and maintain code consistency. Collaborated with international clients and project managers to gather blockchain-specific requirements, scope decentralized solutions, and ensure timely delivery of MVPs and production-ready deployments across various L1 and L2 chains.
Blockchain Developer
Designli
2019 - 2020
Led the architecture and development of Ethereum-based smart contracts for custom DApps, focusing on gas optimization, upgradeability, and audit-ready code using Solidity and OpenZeppelin libraries. Built full-stack decentralized applications (DApps) integrating Web3.js/Ethers.js with React front-ends and Node.js backends, enabling seamless wallet interactions (MetaMask, WalletConnect) and real-time blockchain data sync. Designed and implemented tokenomics models and smart contract flows for DeFi applications, including staking, yield farming, and vesting schedules, ensuring both scalability and security. Collaborated with UI/UX, product, and QA teams in Agile sprints, translating user stories into robust blockchain features, while maintaining clear documentation and versioning using Git and Hardhat. Contributed to multi-chain development initiatives, including deployment and testing on testnets/mainnets like Polygon and BSC, while creating reusable smart contract modules and integration scripts for cross-chain operability.

Skills

dao
ethereum
ethereumjs
graphql
hardhat
javascript
nextjs
nft
openzeppelin
polygon
python
rust
smart-contract
solana
solidity
truffle
typescript
web3
english