Hire the Best web3.js Freelancers
in Vietnam

Hi there! I am a skilled and experienced web developer with a focus on PHP, RoR, Laravel, VueJS, and AngularJS. With 15 years of experience in the field, I have worked on a variety of projects ranging from financial, eCommerce, SaaS, and ERP systems to CRM and logistics applications. As a freelancer, I pride myself on my ability to develop custom systems with mobile app integration, replicate site functionality, and provide additional customizations as needed. I specialize in taking over development from overseas developers, cleaning and enhancing code, and delivering high-quality products to my clients. I am proficient in a wide range of technologies, including jQuery, HTML, CSS, Laravel, Ruby, Ruby on Rails, WordPress, MySQL, PostgreSQL, MongoDB, NodeJS, React, VueJS, and many more. I am also experienced in using APIs such as Mailchimp, RETS, Plaid, Stripe, PayPal, eBay, Amazon Marketplace API, Facebook, Twitter, Instagram, Gmail, Google Maps, Google Calendar, Zoho, and Basecamp CRM. In addition to web development, I have strong expertise in Web3 and blockchain development, including working with Ethereum, Solidity, smart contracts, decentralized applications (dApps), NFTs, and DeFi platforms. I am proficient in Web3.js, Ethers.js, IPFS, and integrating blockchain-based payment gateways. My experience includes building and auditing smart contracts, integrating blockchain functionality into existing platforms, and ensuring secure and scalable decentralized solutions. I am also skilled in Linux systems development, MySQL database administration, server optimization, AWS, EC2 Instances, RDS Instances, and troubleshooting web application errors. If you are looking for a talented and reliable web developer who can provide end-to-end solutions, including blockchain integration and Web3 development, please feel free to get in touch with me. I am always ready to take on new challenges and deliver the best possible results.

👨‍💻 +5 years Full-Stack & +3 years Blockchain expertise I transform complex technical requirements into streamlined solutions, helping clients navigate the evolving Web3 landscape with confidence. Technical Proficiency: Frontend: React, React Native, Redux, TypeScript/JavaScript, HTML/CSS Backend: Go, NodeJS, MySQL, PostgreSQL Blockchain: Solidity, Hardhat, EVM-compatible chains (Ethereum, BSC, Avalanche, Polygon, Fantom), Layer 2 solutions, SUI, Solana, Cardano My Approach: I don't just write code—I provide strategic consultation to identify the most efficient, cost-effective technical paths for your project. My solutions prioritize scalability, security, and user experience. Looking for a developer who delivers value beyond implementation? Let's discuss how I can help bring your vision to life. View my portfolio for examples of successful projects across various blockchain ecosystems.

As a web3 developer, I have faith in the potential of blockchain technology and am currently pursuing my goal of becoming a Rustacean.

Hi, I’m Khai. 🏆 I have more than 5+ of experience for Web, Mobile, and Blockchain application. 🎯 𝐁𝐄𝐍𝐄𝐅𝐈𝐓𝐒 𝐓𝐎 𝐇𝐈𝐑𝐄 𝐌𝐄: - Writing clean, high-quality code with the best structure - Delivering fast execution and precise results - Prioritizing exceptional user experience - Providing daily updates and prompt communication 👨🏻‍💻 𝐓𝐄𝐂𝐇𝐍𝐈𝐂𝐀𝐋: 📌 Frontend Expertise: ✓ Proficient in React.js, React Native, Redux, React-hooks, and React-query ✓ Skilled with Next.js, Nuxt.js, Contentful, and Builder.io ✓ Experienced with Material UI, Antd, Radix-UI, Chakra UI and Evergreen-UI ✓ Familiar with Bootstrap, Panda CSS, and Tailwind CSS ✓ Strong command of HTML, CSS, and Styled Components ✓ Competent in GraphQL and Gatsby 📌Backend Development / Databases / Hosting: ✓ Expertise in Node.js, Nesjts, PHP and Solidity ✓ Experience with Chat GPT and Langchain ✓ Proficient with MongoDB, CosmosDB, PostgreSQL, and MySQL ✓ Familiar with AWS, Firebase, Heroku, and Docker 📌 Workflow Methodologies: ✓ Agile, Kanban, and Scrum methodologies ✓ Proficient with GIT, SVN (Bitbucket, GitHub, GitLab) ✓ Experienced with project management tools like Jira, Trello, and Asana 📩 Feel free to reach out if you're looking for expert guidance or services. I'm ready to collaborate with you!

I’m a developer experienced specializing in building apps in various fields such as news, education, finance, and especially crypto. Whether you’re trying to win work, list your services, or create a new online store, I can help

🔥 I am a skilled engineer with experience in iOS/Android, Web applications, Blockchain, and Unity development. I build high-performance mobile, web, game, and blockchain apps from start to finish - whether you’re launching a new idea or need help improving an existing one. 🔥 I have worked with high-impact FIFA projects and collaborated with diverse international teams. 🔥 Technical Expertise: ✅ Mobile development: React Native (Scalable architectures, TypeScript, and Modular Design Patterns) | Expo ✅ Web application: React.js | Next.js | TailwindCSS | ElasticSearch ✅ Back-end: NodeJS (Express) | Python (Django) | API servers (RESTful APIs and GraphQL) | ASP.Net Core ✅ Blockchain: Web3 API | Solidity (Smart Contract) | Truffle Suite ✅ Cloud: Azure, IaaS, CI/CD Pipelines ✅ Game: Unity Engine (C#) ✅ Firebase Integration: Firestore, Authentication, Cloud Functions, and Messaging for real-time updates and enhanced functionality. ✅ QA: Manual functional | Tests automation ⭐ Why you should choose me over other freelancers ⭐ ✅ Budget-Friendly: You have budget limitations and need efficient and cost-saving development. ✅ Planning and Code Review: I analyze flowcharts, design or make code review and provide you with a detailed development plan together. ✅ Optimized Performance: Focus on app optimization for speed and low memory consumption. ✅ Security-First Approach: Prioritize security with SSL encryption, OAuth 2.0, JWT, and end-to-end encryption. ✅ Custom Solutions: You look for custom solutions to address your particular business objectives. ✅ Client Satisfaction: I always aim to bring real value and build strong, TRUST-based relationships with my clients. ✅ Support After Launch: Ongoing maintenance and updates to ensure long-term success and adaptability to new technologies. ⭐ Personal Qualities That Make a Difference ⭐ ✅ Kind and Respectful: Kindness is a core part of who I am. I treat everyone with respect, approach every situation with empathy, and truly care about helping my clients improve their situations. ✅ Responsiveness: Being extremely responsive and keeping all lines of communication readily open with my clients. ✅ Always Give More: This is a key part of how I work. I aim to give more than expected and take pride in surprising my clients with results that exceed their expectations. Ready to build or improve your app? Whether you need something new, want to add features, or just need technical advice — I’m here to help. Let’s chat about your project and make something great together!