Jashedul asif

Full Stack Web3 & Blockchain Developer

Fiverr • Freelance

Sep 2024 - Present • 1 yr 10 mos

Worked as a freelance blockchain and full-stack developer delivering Web3-based applications, smart contracts, and decentralized exchange (DEX) integrations. Built and maintained scalable DeFi systems, token contracts, and cross-chain swap logic. Key responsibilities included: - Designing and developing smart contracts (Solidity) for tokens, staking, and vesting systems - Building DeFi swap integrations (Uniswap-style AMM logic and router interactions) - Developing full-stack dApps using React, Next.js, and Ethers.js / Wagmi - Integrating wallets (MetaMask, WalletConnect, RainbowKit) for seamless Web3 UX - Working with multi-chain environments (EVM networks like AVAX, BNB, SEI, etc.) - Implementing backend services for indexing, pricing logic, and transaction monitoring - Optimizing gas usage and ensuring contract security best practices Achievements : - Delivered multiple end-to-end Web3 applications including token launch and swap systems - Built automated trading and liquidity logic for decentralized exchange environments - Successfully integrated multi-chain swap flows across EVM-compatible networks - Improved smart contract efficiency and reduced unnecessary gas consumption - Helped projects move from concept to deployable MVPs with production-ready architecture

Full Stack & Web3 Developer

LinkedIn • Indépendant

Mar 2020 - Present • 6 yrs 4 mos

As a freelance Full-Stack and Web3 Developer, I help startups and businesses build modern web applications, AI-powered solutions, and blockchain products. I work closely with clients to turn ideas into scalable, user-friendly applications while delivering projects on time. Key Contributions - Developed responsive full-stack web applications using React, Next.js, Node.js, TypeScript, and PostgreSQL. - Built AI-powered SaaS platforms and workflow automation tools. - Created Web3 applications with smart contract integration, wallet authentication, and NFT functionality. - Improved website performance, SEO, and overall user experience. - Collaborated with international clients, providing end-to-end development from planning to deployment.