Hire the Best web3.js Freelancers
in Brazil

Hello! I’m Sebastião, a Senior Web3 Developer with over 9 years of experience, including 8+ years specializing in blockchain technologies and decentralized applications (dApps). I combine cutting-edge Web3 expertise with sleek, responsive frontend development to deliver seamless, user-friendly blockchain solutions. I’m a Web3 developer who bridges the gap between innovative blockchain technologies and top-tier frontend design. I focus on delivering scalable, secure, and intuitive solutions that meet your business needs while providing an exceptional user experience. My Achievements - Designed and launched an NFT marketplace, enabling minting, trading, and staking of unique digital assets, used by artists and collectors globally. - Built a fractional NFT platform, allowing tokenization and shared ownership of high-value assets like real estate and artwork. - Developed a cutting-edge Web3-enabled frontend for a decentralized finance (DeFi) application, ensuring high performance and intuitive user interaction. - Delivered smart contract solutions for a multi-chain token launchpad, supporting Ethereum, Polygon, and Binance Smart Chain (BSC). - Partnered with UI/UX teams to deliver pixel-perfect designs integrated with blockchain functionalities for dApps. My Skills - Blockchain: Ethereum, Polygon, Binance Smart Chain (BSC), Solidity, Hardhat, Truffle - Frontend: React, Next.js, Vue.js, HTML5, CSS3, TailwindCSS - Web3: Web3.js, Ethers.js, Metamask integration - Backend: Node.js, Express.js, Python, Django, RESTful APIs - Storage: IPFS, Pinata, Arweave - Version Control & Collaboration: Git, GitHub, GitLab, Jira, Slack Whether you’re launching an NFT project, a Web3 application, or a decentralized platform, I’m here to help bring your ideas to reality. Let’s collaborate to make your project a success!

I’m a passionate Frontend Developer with experience building scalable and user-friendly SaaS platforms. I’ve led the migration of applications to modern frameworks like React, improving scalability and performance, while also developing APIs for seamless integration. My work includes implementing new components, building dashboards, and optimizing system architecture to enhance user experience. My expertise includes React.js, JavaScript, and creating responsive, visually appealing interfaces. I thrive on solving technical challenges and delivering high-quality solutions that drive user satisfaction. I’m excited to bring my skills and experience to new projects and continue growing as a developer. Front-End: HTML | CSS | JavaScript | React.js | Next.js Back-End: MongoDB | Node.js

I'm a full-time, full-stack developer with over 10 years of experience creating seamless and secure websites for companies of all sizes. As a former in-house developer in the startup SaaS field, I have a well-rounded skill set, marketing experience, and a passion for bringing innovative ideas to fruition. I'm passionate about creating original, engaging design solutions that truly resonate with your audience and are functional based on your unique needs. My background in web applications development has honed my ability to think outside the box and approach each project with a fresh, creative perspective. I'm confident that my skills and experience will take your website to new heights, ensuring it stands out from the crowd and achieves its full potential. My tech stacks: - JavaScript, TypeScript, Python, PHP, HTML5, CSS3 - React, NextJS, Vue, NuxtJS, MUI, gulp - NodeJS, ExpressJS, Socket.io - Django, FastAPI, Flask - Laravel, Symfony, Codegniter - WordPress, Shopify, Sanity - GIS, Mapbox GL JS, Mapbox API, Mapbox SDK - Web3.js/Ethers.js, Solidity - Three.js, Babylon.js, WebGL - PostgreSQL, MongoDB, MS SQL Server