Hire the Best Blockchain Developers
in Bangladesh

Want to work with an experienced Blockchain developer who can bring your smart contract, decentralized application (dApp) vision to life? Are you looking for a Solidity or Rust developer to develop "Gas-Optimized" smart contracts? Whether you're looking to create ERC20 or SPL tokens, ERC721, ERC1155, or NFTs with custom features, concerned about vulnerabilities and exploits in your high-value contracts, need to write tests for contracts, or need a script to interact with leading DEX protocols—I've got you covered. 🖐 Some of my previous clients' quotes about me: ✔️ "...Excellent technical skills and consistently good communication... Completed the project in a timely fashion, exceeding our original deadline." ✔️ "His work was phenomenal...made sure I understood every step along the way... ✔️ "..took this project on as if it was his own... Great professional skills, always there to answer questions and suggest the best solutions." ✔️ "...Every facet of his work was impressive. WOW!" ✔️ "... goes above and beyond. Md's professionalism and expertise in blockchain are unmatched.." ✔️ "... communication is excellent, delivery is fast, and his knowledge of smart contracts is impressive." With expertise in EVM-compatible chains (like Ethereum, BSC) and Solana, I specialize in delivering high-performance, gas-optimized smart contracts and dApps tailored to your specific requirements. I help my clients build secure and highly resilient smart contracts, minimizing vulnerabilities and ensuring your code is fortified against exploits. I might be the perfect fit if you're thinking of any of these: ✅ "I need the BEST developer who's as passionate about my success as his own." ✅ "I want someone who will walk me through every step of smart contract interaction." ✅ "Gas fees are too high! My smart contract needs to be lightning-fast and cost-efficient." ✅ "I know blockchain, but I need a professional to make my smart contracts 100% secure." ✅ "I’m not an Ethereum or Solana expert, and I don’t have time to mess around with dApps." ✅ "Our last dApp was a disaster—I can’t afford to let that happen again." ✅ "I need an EVM-compatible blockchain or Solana expert to cover all my bases for cross-chain or multi-chain applications." Working with me, you will: 💎 Gain access to a developer skilled in Python, JavaScript, TypeScript, Rust, Solidity, Brownie, Hardhat, NextJS, Foundry, and Anchor. 💎Eliminate vulnerabilities and reduce gas fees during both deployment and interactions. 💎 Maximize your DApp's security with continuous follow-ups for improvements. 💎 Save time and resources—you won’t need to hire separate back-end, front-end, Rust, or Solidity developers because I handle it all as a full-stack developer. 💎 Receive custom scripts to swap, add, or remove liquidity, lend, deposit, borrow, withdraw, and interact across top dApp protocols. 💎 Optimize for multi-chain functionality—Whether you need to bridge Ethereum, BSC, or Solana, I can create solutions that integrate seamlessly across multiple networks. 🖐 My Skills & Expertise in Blockchain: ☑️Solidity Development for EVM-compatible smart contracts ☑️Rust Development for Solana Blockchain ☑️Experience with Chainlink, various ERC standards, and OpenZeppelin ☑️Token development(ERC20/BEP20/SPL) with features like Mintable, Burnable, Reflections, TxFee, Whitelist/Blacklist, and IDO/ICO for tokens. ☑️NFTs (ERC721, ERC1155, ERC404, etc) with Whitelist, Royalties, Presale, Public Sale, Dutch Auctions, IPFS Hosting, and Dynamic NFTs ☑️Full-stack Blockchain Developer with expertise in Solidity, Python (Brownie), JavaScript (Hardhat), Typescript, Rust(Anchor), NextJS, and Foundry. ☑️Script/Program Development for deploying/interacting with smart contracts and protocols like Aave, Uniswap, Raydium, and PancakeSwap. Why Work With Me: 💎Extensive Experience: I've designed and built hundreds of smart contracts from scratch, creating robust back-end scripts for deployment. 💎Expert Problem Solver: Proficient in designing projects from the ground up, solving complex problems, and rapid iterative prototyping. 💎Gas Optimization Strategies: I use professional strategies to optimize smart contracts for minimal gas fees and thoroughly test them to identify and prevent potential exploits. My Background in Numbers: ✔️ Over 3 years of experience with Blockchain technology. ✔️ Developed numerous DApps and scripts for protocols and tokens, including ERC20, BEP20, SPL, ERC721, and ERC1155. ✔️ Worked on several growing DApp projects, such as Crowdfunding platforms, Airdrop systems, DEXs, insurance, ICO, IDO, Tokens, Lottery, and NFT marketplaces. ✔️ Created a variety of smart contracts. ✔️ Wrote extensive test scripts for smart contracts using Foundry, Hardhat, and Anchor. Sound Like a Fit? Next Steps: Click the green "Invite to Job" button in the top right-hand corner or send me a message, and let’s schedule a call to discuss your project! Otherwise, feel free to book a consultation!

Are you looking for a gas-optimized, highly secure smart contract or a full-scale decentralized application (DApp)? I can build a solution that will live forever on the blockchain. I am Sayem Abedin, a Blockchain enthusiast and experienced Full Stack MERN Developer. My mission is to help your Web3 ideas grow from a simple concept into a production-ready, scalable reality. Whether you need a custom token, a complex smart contract, or an end-to-end DApp, I provide secure, trouble-free development. I utilize Solidity for the backend and React/Next.js with Web3.js to create seamless, user-friendly interactions with the chain. 🛠️ My Web3 & Full Stack Services 1. Smart Contract Development & Security 2. Custom Smart Contracts: Tailored logic using Solidity and OpenZeppelin standards. 3. Token Creation: Secure deployment on EVM chains (ERC-20, BEP-20, TRC-20). 4. Gas Optimization: Writing highly efficient code to keep your transaction costs low. 5. Rigorous Auditing: Line-by-line manual analysis to find logical errors and perform critical logic checks. 6. Vulnerability Prevention: Securing code against known attack vectors (Reentrancy, Front-Running, etc.) and performing simulated deployment attacks. Full Stack DApp Development 1. Custom DApps: End-to-end decentralized application architecture. 2. Frontend UI/UX: Responsive, modern, and intuitive designs using Next.js and React. 3. Scalable Backend: Secure and robust infrastructure using Node.js. Why Choose Me? I don't just write code; I build secure ecosystems. To guarantee your peace of mind, I provide free support even after the project is completed to ensure everything runs smoothly. 💻 My Tech Stack: Blockchain: Solidity, Web3.js, Ethers.js, Hardhat, Truffle, OpenZeppelin Frontend: React.js, Next.js, Tailwind CSS Backend: Node.js, Express.js, MongoDB (MERN Stack) I am looking forward to doing business with you! Send me a message, and let's discuss how we can bring your Web3 project to life.

Top Rated Plus | $70K+ Earned | 141 Projects | 9+ Years | Published Shopify App Author I help eCommerce brands, startups, and agencies build powerful Shopify solutions from custom Shopify apps and Hydrogen storefronts to Shopify Plus integrations and automated workflows that perform reliably and scale with your business. ──────────────────────────────────────── 🚀 PUBLISHED SHOPIFY APPS (Live on App Store) ──────────────────────────────────────── - Blog CTA - Real-Time Find & Replace - Simple Product Rating - Torosachi Subscription Building and shipping real apps means I understand Shopify's ecosystem at a production level not just as a freelancer, but as a product developer. ──────────────────────────────────────── 🔧 WHAT I BUILD ──────────────────────────────────────── ✔ Custom Shopify Apps (Remix, Polaris, Prisma, Shopify CLI) ✔ Shopify Admin API, Storefront API & GraphQL ✔ Shopify Billing API & Subscription Systems ✔ Checkout UI Extensions & Post-Purchase Extensions ✔ Shopify Hydrogen / Oxygen Storefront Development ✔ Shopify Webhooks & Custom Workflow Automations ✔ Shopify Theme Development & Customization (Liquid) ✔ Figma to Shopify Theme Conversion ✔ Shopify Speed Optimization & Core Web Vitals ✔ Third-Party API Integrations ✔ Shopify Plus Scripts, Flow, B2B, Markets ──────────────────────────────────────── 💡 WHY CLIENTS CHOOSE ME ──────────────────────────────────────── ✔ Top Rated Plus on Upwork (top 3% of talent) ✔ 141 completed projects with 130+ reviews ✔ Shopify Certified Developer ✔ I take full ownership from scoping to deployment ✔ Clean, scalable, production-ready code architecture ✔ Fast response time and transparent communication ✔ Long-term collaboration mindset not just one-off gigs ──────────────────────────────────────── 🛠 TECH STACK ──────────────────────────────────────── Shopify · Remix · Hydrogen · Polaris · Liquid · React · Node.js · TypeScript · GraphQL · Prisma · Next.js · REST APIs · Laravel ──────────────────────────────────────── If you need a Shopify expert who delivers production-ready work on time and communicates clearly throughout let's talk. Send me a message or invite me to your job. I respond fast.

I've spent 15 years building everything from enterprise websites to complex SaaS platforms for startups and established businesses. My track record: 100% Job Success Score, Top Rated status, and zero missed deadlines. 𝐇𝐨𝐰 𝐈 𝐖𝐨𝐫𝐤 🔺 Senior engineering mindset — Speed and precision in every line of code 🔺 Low-maintenance partnership — Proactive problem-solving means fewer meetings, faster progress 🔺 Clear communication — Regular updates. You're always in the loop 🔺 Business-minded — Every technical decision ties back to your ROI and user experience 🔺 I take ownership — Focus on your business. No micromanaging needed 🔺 Process-driven approach — Timelines, milestones, and transparency at every stage 🔺 AI-accelerated delivery — Modern tooling for faster development without compromising quality 𝐖𝐡𝐚𝐭 𝐈 𝐃𝐞𝐥𝐢𝐯𝐞𝐫 As a full-stack developer with 13 years across eCommerce, SaaS, and enterprise web development, I transform your ideas into scalable, revenue-ready products. I manage the complete development lifecycle so you can focus on growth. You should expect nothing short of: ✔️ Enterprise websites with conversion-optimized UI/UX ✔️ MVPs and SaaS platforms built to scale from day one ✔️ Complex API integrations with any third-party service ✔️ Payment processing and eCommerce ready to monetize ✔️ Fully responsive design across all devices ✔️ AI-powered development for 2-3x faster turnaround when speed matters ✔️ Clean, maintainable code your next developer will thank you for ✔️ Post-launch support and ongoing development 𝐌𝐲 𝐆𝐮𝐚𝐫𝐚𝐧𝐭𝐞𝐞 1. I keep revising until you're 100% satisfied 2. Free bug fixes for 30 days post-launch 3. If I miss a deadline, you get 20% off (hasn't happened yet) 𝐓𝐞𝐜𝐡 𝐒𝐭𝐚𝐜𝐤 Frontend: React, Next.js, Svelte, Tailwind, HTML, CSS Backend: Node.js, NestJs, TypeScript, JavaScript, Python, Go AI Integration: Custom LLM implementations, workflow automation, intelligent features Platforms: WordPress, Shopify, WooCommerce, WebFlow Tools: AWS, Docker, PostgreSQL, MongoDB, Figma, Claude, v0, Bolt, Bubble, Lovable AI Tools: Claude, v0, Bolt, Bubble, Lovable 𝐑𝐞𝐚𝐝𝐲 𝐭𝐨 𝐁𝐮𝐢𝐥𝐝? Click "Invite to Job" and tell me about your project. Same-day response guaranteed.

I am a full-stack software and blockchain developer with many frameworks and language experience. I am good with complex algorithms, security, performance optimization, etc. I have worked in Qoddi, Smartxchange, and Posterity io and have been a dedicated collaborator. I take responsibility as a leader and suggestion-maker. I have been praised for clean and well-structured code. I have worked on 20+ projects with so many companies including - Qoddi, SmartXchange, Westcoastnft, Posterity, Sayenko Design, Wasserman Media, Sightcall, Design District, Global Monitoring Solutions, Django Junkie, Selften, Koii network, Hailingprint, etc. Algorithms - On my Github repo 1000-Days-Of-Rust-Go-Python-Js-C-Zig-Carbon Achievement Overview- – Achieved fast speed by optimizing 40000 data load speed on the Vevent canvas page – A great DB transaction and committing mechanism developed in Vevent for real-time painting – Mutex lock and HTTP request blocking in Koii network development on cosmos – Secure and Audit ready smart contract development for Smartxnft private marketplace – Use of opengsn, biconomy, openzeppelin defender for gasless transaction – Creating Coding marketplace development for posterity io – Atomic design system development – REST, GraphQL, gRPC streaming experience – Custom Server Side Rendering react based (Prior to NextJS) project development – Associated developing Rust Builder on Qoddi com – Wrote 30 blog post on Qoddi Tools Overview- --Worked with JavaScript, TypeScript, Express, Nest, Ruby, Rails, Python, Django, Flask, Rust, Actix, Fiber, Electron, React Native, -- Solidity, Yul, Cadence, Solana, Flow, BSC, Polygon, Terra, Cosmos Blockchain, OpenGSN, Flashbot, Uniswap, AAVE -- Developed two NFT marketplaces and two blockchain network --Created monolithic, microservices, Graphql, REST, MVC, gRPC, and Serverless architecture -- Can create own auth server, or use OAuth2, Okta -- Used tools like Skaffold, docker, Kubernetes, Jenkins, GitHub actions, Kafka, RabbitMQ, NATS, Load Balancer, etc --Experience in clouds with AWS, GCP, Digital Ocean, Heroku, Vercel, etc --Have used Apache, Nginx, IIS --Unit test, snapshot test, automation test --Frontend with React, Next, Redux, TypeScript, Template Engines --Databases like RDBMS, MySQL, PostgreSQL, MongoDB, DynamoDB, Fauna with Prisma, TypeORM, Sequelize, Mongoose, Redis --Designed and developed UI system, Design System, Monorepositories, and storybooks --Used libraries like Redux, Wagmi, Mantine, Foundry, Hardhat, Ethers, --Security best practices followed using Web3Bugs, Simple Security Toolkit, OpenZeppelin

Welcome to my profile! I’m Shakil Hossain, an experienced Web, Mobile App, and Blockchain developer with a proven track record since 2018. I’m here to bring your ideas to life with expert solutions tailored to your needs. Here’s what I offer: ✅ Blockchain & Web3 Development – DApps and smart contract solutions for cutting-edge projects. ✅ Web Application Development – Custom, fully functional web apps built to your specifications. ✅ Mobile App Development – Engaging, high-performance mobile apps for iOS and Android. Let’s discuss your project and make it a success!