Results-driven Web3 Developer and Technical Writer with over 4 years of experience building decentralized applications (dApps) and crafting high-impact technical documentation. Specializing in smart contract development, protocol integration, and translating complex blockchain concepts into accessible content. Proven track record of delivering secure, optimized code and engaging technical material for DeFi and NFT projects on a freelance basis. Ready to help CryptoTask clients launch secure protocols and scale their ecosystem growth.

Core Competencies

Blockchain & Smart Contracts: Solidity, Rust, Hardhat, Foundry, Remix, Web3.js, Ether.js.
Frontend Web3 Integration: React.js, Next.js, TailwindCSS, TypeScript.
Security & Optimization: Gas optimization, smart contract auditing basics, Slither, Mythril.
Technical Writing: Whitepapers, API documentation, developer guides, GitBook management.

Freelance & Professional Experience

Freelance Web3 Developer & Technical Writer | Remote
Jan 2024 – Present

Designed and deployed secure Solidity smart contracts for 5+ client projects, including a custom ERC-20 staking protocol that reduced gas costs by 18%.
Integrated Web3 wallets (Metamask, WalletConnect) into React-based frontends, improving user onboarding flows for decentralized applications.
Authored comprehensive developer documentation and full-length whitepapers for an emerging Layer-2 DeFi protocol, leading to a 35% increase in developer adoption.
Conducted internal code reviews and vulnerability assessments using automated tools to ensure protocol safety prior to mainnet deployment.

Blockchain Developer | Nexus DeFi Labs
Mar 2022 – Dec 2023

Collaborated in a remote team to build and maintain automated market maker (AMM) smart contracts on Ethereum and Polygon.
Wrote modular, well-tested code using Foundry, achieving 95%+ test coverage across all core protocol repositories.
Assisted marketing and product teams by writing technical blog posts explaining protocol upgrades, breaking down complex cryptographic primitives for retail users.

Key Projects

DeFi Yield Aggregator Protocol

Developed core smart contracts for a cross-chain yield optimizer utilizing Hardhat and Solidity.
Implemented strict access controls and emergency stop mechanisms to safeguard user funds against potential exploits.

Web3 Education Hub

Built an open-source educational platform using Next.js and TailwindCSS that teaches beginners how to interact with smart contracts.
Wrote 15+ high-quality technical guides covering gas optimization, ERC-721 frameworks, and decentralized storage solutions (IPFS).

MD. Hasibul Hasan

Freelancer from chittagong, Bangladesh