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Anupam B.

Kolkata, India

$10/hr
5.0
20 jobs

Blockchain & AI Agent Developer specializing in Solana, Ethereum, Rust, Solidity, Smart Contracts, Agentic AI, and Web3 Infrastructure. I build blockchain systems and AI agents that work in production not just on testnet. My core focus is the intersection of Web3 and Agentic AI smart contracts, autonomous AI agents, and on-chain payment infrastructure. I've deployed on Ethereum, Polygon, Solana, and XPR Network, and built everything from NFT marketplaces to full Layer-1 blockchain ecosystems. What I build: Agentic AI & x402 Payment Infrastructure — Autonomous AI agents that transact on-chain using the x402 HTTP payment protocol, enabling machine-to-machine micropayments without human intervention. Solana-Like Blockchain Ecosystem — Full Layer-1 chain with consensus mechanism, validator nodes, and staking logic built from scratch. NFT Marketplace — Minting, listing, and trading platform with custom smart contracts across multiple EVM chains. Student Certificate Verification DApp — Decentralized credential system using Ethereum + Hyperledger. WASM Smart Contracts on XPR Network — C++ based contracts deployed on-chain. Technical stack: Solidity, Rust, React.js, Node.js, Web3.js, Python, IPFS, Hyperledger, MongoDB — plus AI/ML frameworks for agent development and automation. I work with founders and dev teams building at the edge of blockchain and AI where autonomous systems need to interact with on-chain infrastructure. If your project involves AI agents, Web3 payments, or smart contract systems, I understand both layers. Let's scope your project.

  • web3.js
  • MongoDB
  • Python
  • C++
  • Blockchain
  • Golang
  • Solidity
  • Rust
  • Solana
  • Ethereum
  • Bitcoin
  • Artificial Intelligence
  • AI Agent Development
  • Machine Learning
  • Next.js
  • IPFS
  • Hyperledger Fabric
  • Web3
  • DApp Development
  • ZK Framework
Muhammad Asmar N.

Faisalabad, Pakistan

$8/hr
5.0
70 jobs

I help startups and growing businesses build fast, scalable web and mobile apps using Python, Laravel, React Native, and React. I work as a full stack developer who can take a product from idea to production with clean code and predictable delivery. If you need a reliable web developer for modern UI work and a strong mobile app developer for iOS/Android builds, I can cover both while staying hands-on as a full stack developer focused on performance, UX, and maintainability. I’ve delivered solutions for founders who need speed now and stability later, and I communicate clearly at every step.🔥 I’m an experienced Web engineer, React engineer, Vue engineer, and React Native engineer with 7 years of production experience. As a full stack developer I can build backend APIs, admin panels, dashboards, and customer-facing apps, and as a web developer I pay attention to UI details that improve conversion and retention. I’ve completed a wide range of successful projects, from MVPs to large systems with long-term maintenance and continuous improvements. 🚀I also lead a web development team, techXen Solutions . We have multiple Laravel developers (Senior PHP and Custom PHP MySQL), Python (Django), and JavaScript (React, Vue, React Native) developers. If your project needs a dedicated mobile app developer, we can staff that role quickly, while I stay involved as a full stack developer to keep architecture, delivery, and communication aligned. When the UI scope grows, a senior web developer can join the project while I remain the full stack developer responsible for end-to-end quality.🚀 Our team has already worked in such industries as: ✅ Marketplace ✅ E-commerce ✅ Travel and Hospitality ✅ Custom ERP (Enterprise Resource Planning) ✅ ChatGPT integration (LLM model in your website front end) ✅ Automotive (car inspection, automotive ERP, car sharing, rental, selling) ✅ Social media (Tinder-like networks, short video platforms, communities) ✅ Sales (CRM systems for sales teams, retail, hospitals, sales departments) ✅ Sport (gym management systems, trainer platforms, fitness apps, club portals) ✅ Legal (document automation, AI-assisted legal processing) ✅ Healthcare (clinic management, booking, mental health software) ✅ Education (LMS, automated training, coaching marketplaces) ✅ Finance (fintech platforms, investment platforms, bank API integrations, calculators) ✅ Manufacturing (shop floor management and automation) ✅ Human resources (HRM systems) ✅ Digital marketing (Meta, Facebook/Instagram, TikTok, Google APIs, analytics) Stack of technologies we use: ✅ HTML/CSS, Bootstrap, Tailwind ✅ JavaScript (React, Vue, Node.js, Express, AdonisJS, Nuxt) ✅ React Native for cross-platform mobile delivery ✅ API integrations (Stripe, PayPal, Twilio, TextMagic, Xero, DocuSign, Google Maps, Meta APIs, and more) ✅ API development (Laravel, Node/Express, Firebase, Python/Django, Go, REST, GraphQL) ✅ PWA (Progressive Web App) ✅ Databases: MySQL, PostgreSQL, MongoDB, DynamoDB, Elasticsearch ✅ Infrastructure: AWS, DigitalOcean, Firebase, Supabase ✅ DevOps and administration: LAMP, CentOS, Ubuntu As a full stack developer, I connect the front end, back end, and infrastructure so releases are smooth. When the scope includes native-like UX, I can collaborate with a mobile app developer without slowing down the API roadmap, and a web developer can refine UI flows while we keep the backend stable. You can hire me as a full stack developer for full ownership, or extend the team and keep me as the full stack developer leading architecture and delivery. If timelines are tight, add a mobile app developer to parallelize mobile features, and add a web developer to accelerate dashboards and front-end work. 🚀 Buzz words clients search for: website development, JavaScript, React MySQL, Amazon Web Services, API integration, database architecture, CRM, custom ERP, REST, GraphQL, Laravel, React, Vue, React Native. If you need a full stack developer who can also guide a delivery team, I’ve done that for years. If you need a reliable mobile app developer for consistent releases and store readiness, we can support that too, and if you need a web developer for pixel-perfect UI, that’s covered. In our work history you’ll find successful products built with React, JavaScript, MySQL, React, Vue, and React Native, plus multiple systems built with Python (Django, Flask, FastAPI). I also use LLM capabilities and AI APIs (including OpenAI integrations) when they genuinely improve the product experience. We have 15 senior developers across React, JavaScript, MySQL, Python, Go, and Node.js. As a full stack developer, I can jump into an existing codebase, stabilize releases, fix bottlenecks, and plan the next iterations. Please contact me for further details and fruitful work. Best regards, Asmar Naeem CEO, TechXen Solutions

  • Full-Stack Development
  • Web Development
  • Next.js
  • WordPress
  • React
  • Tailwind CSS
  • Mobile App Development
  • Front-End Development Framework
  • Front-End Development
  • MERN Stack
  • Web Design
  • Figma
  • React VR
  • Responsive Design
  • React Bootstrap
Mark V.

Limassol, Cyprus

$80/hr
5.0
70 jobs

We help Web3 teams launch DeFi protocols, NFT infrastructure, Crypto Wallets, and scalable rollup-based systems – fast, securely, and without over-engineering. No buzzwords. No spaghetti code. Just clean architecture, modular contracts, and deep blockchain thinking. 🔹 What We Build • DeFi Protocols 1/ Lending, staking, vesting, governance 2/ Yield strategies, liquidity protocols, Curve-style AMMs 3/ Modular tokenomics across L1s and L2s 4/ Cross-chain DeFi with LayerZero, Axelar, IBC Tech: Solidity, Vyper, Rust, Hardhat, Foundry, zkSync, Arbitrum, Optimism, Base, Cosmos SDK, Substrate • NFT Infrastructure 1/ ERC721/1155 contracts, marketplaces, royalties 2/ Minting engines, auction logic, NFT staking 3/ NFT + DeFi hybrids (e.g. financial NFTs) Tech: ERC721A, OpenZeppelin, Seaport, IPFS, The Graph, Polygon, zkSync, Avalanche, Blur Protocol • Crypto Wallets 1/ Smart contract wallets (ERC-4337, account abstraction) 2/ Multichain wallet integrations (EVM + non-EVM) 3/ MPC & social recovery flows 4/ Transaction batching, gasless UX, custom signing logic Tech: ethers.js, viem, Wagmi, RainbowKit, Safe, WebAuthn, Passkeys, zkSync AA, Starknet AA, WalletConnect • Rollups & Modular Chains 1/ App-specific rollups with OP Stack or zkStack 2/ DA integration: Celestia, EigenLayer, Rollkit 3/ Custom sequencers, settlement bridges, messaging 4/ Token + gas abstraction, interoperability layers Tech: Starknet, zkSync Era, OP Stack, Substrate, Cosmos SDK, Polygon CDK, Cairo, Noir 🔧 How We Work • Clean, gas-optimized, audit-ready code • Fast iterations, deep collaboration • No overengineering – just outcomes • Honest communication. Real product thinking.

  • Blockchain
  • Web3
  • Blockchain Platform
  • Blockchain Development
  • Blockchain, NFT & Cryptocurrency
  • Ethereum
  • Smart Contract Development
  • Crypto Wallet Development
  • Solidity
  • Tokenomics
  • Smart Contract
  • DeFi
  • Solana
  • Blockchain Architecture
  • Blockchain Tokenization
Andriy T.

Ukrainka, Ukraine

$25/hr
4.8
13 jobs

Senior Front-End Developer | Expert in Angular & React Native & Vue | TypeScript | SCSS | Node.js 🔹 8 Years of Professional Experience 🥇Top Rated (100% Job Success Rate) I’m an experienced Front-End Developer with a strong foundation in modern web technologies and over 7 years of experience in building scalable, high-performance web applications. My focus is on delivering visually appealing and user-friendly solutions that exceed client expectations. 📌 𝐌𝐲 𝐄𝐱𝐩𝐞𝐫𝐭𝐢𝐬𝐞: ✔️ 7+ years of professional experience in web and mobile app development. ✔️ 5+ years of uninterrupted experience with Angular 2+ and related technologies (TypeScript, RxJS, NgRx and different UI libraries). ✔️ 2+ years of development experience with React/Redux/React Native, Nuxt.js, Vue.js and Wordpress ✔️ good knowlege of AJAX, JSON, REST API, GRAPH QL, OOP, SOLID, DRY, KISS, YAGNI ✔️ good understanding Docker, CI-CD integration ✔️ good knowlege Node.js, Express, Mongo DB, PostgreSQL 📌 𝐇𝐨𝐰 𝐈 𝐂𝐚𝐧 𝐇𝐞𝐥𝐩 𝐘𝐨𝐮: ✅ Implementing sleek, pixel-perfect interfaces based on detailed UX/UI designs ✅ Collaborating with designers and developers to bring your vision to life ✅ Ensuring scalable, optimized, and maintainable code for long-term success ✅ Creating reusable components and optimizing applications for maximum performance Strong communication skills, work well both independently and within the team. Quickly learns and masters new concepts and skills. 📌 𝐌𝐲 𝐒𝐤𝐢𝐥𝐥𝐬: Angular, AngularJS, Angular CLI, Single Page Applications (SPA), Reactive Forms, Template-Driven Forms, RxJS, NgRx, State Management, Component-Based Architecture, Dependency Injection, TypeScript, JavaScript, Progressive Web Applications (PWA), Lazy Loading, HTML5, CSS3, SCSS, SASS, Bootstrap, Material Design, Angular Material, TailwindCSS, React Native, Vue.js, Vuetify, Pinia, PrimeNG, Kendo UI, Webpack, Babel, ESLint, RESTful APIs, GraphQL, API Integration, CRUD Operations, RxJS Operators, Jasmine, Karma, Protractor, Responsive Design, Cross-Browser Compatibility, Accessibility (WCAG), Figma, Git, GitHub, GitLab, Bitbucket, CI/CD, Docker, Firebase, Websockets, Socket.IO, Data Visualization, Chart.js, Highcharts, Agile Development, Scrum, Jira, Trello, Slack, Website Optimization, Performance Tuning, Lighthouse Audits, Browser Developer Tools, SEO Best Practices, Localization, Internationalization (i18n), Security Practices (OWASP), Design Systems, Component Libraries, Frontend Architecture, Code Refactoring, Debugging, Documentation, UI/UX Collaboration, SaaS Platforms, Ecommerce Platforms, Real-Time Applications.

  • HTML
  • JavaScript
  • SCSS
  • Bootstrap
  • Angular
  • AngularJS
  • Angular Material
  • TypeScript
  • RxJS
  • React Native
  • REST API
  • GraphQL
  • Flexbox
  • Nuxt.js
  • Firebase
Shubham S.

Baramati, India

$20/hr
5.0
4 jobs

Smart Contract Engineer specializing in Solidity and DeFi systems on Ethereum and EVM chains. I build secure smart contracts, staking systems, token ecosystems, and Web3 applications with a focus on security, gas optimization, and production-ready architecture. I design and implement production-grade smart contracts for lending, staking, vesting, and token ecosystems — with a strong focus on collateralization logic, liquidation safety, gas efficiency, and protocol-level security. I don’t build demos. I build systems where real value is at risk, and correctness, safety, and clarity matter. 🔹 What I build DeFi lending protocols (collateral, LTV enforcement, health factor, liquidation, interest accrual) Staking & reward systems (finite reward pools, safe accounting, no infinite minting) Vesting contracts (cliff + linear vesting, founder & investor-safe designs) ERC20 token contracts (custom logic, controlled mint/burn, secure allowance handling) Security-focused smart contract architecture (reentrancy protection, access control, CEI pattern, protocol invariants) Smart contract integration (ethers.js, wallet interactions, transaction flows) 🔹 How I work I think in protocol flows and invariants, not just individual functions I identify edge cases and security risks early I explain technical trade-offs clearly to non-technical stakeholders I write code that is testable, auditable, and maintainable I’m comfortable working independently or with distributed teams 🔹 What you can expect Clean, well-documented Solidity code Security-first design decisions Clear communication and realistic timelines Honest feedback on risks and limitations Long-term maintainability over shortcuts 🔹 Let’s work together If you’re building a Web3 product that involves real asset flow, DeFi logic, or security-critical smart contracts, I can help you design and implement it correctly from day one. I’m happy to review your idea, point out potential risks, and suggest a solid technical approach before any code is written.

  • NFT
  • Blockchain Architecture
  • Web Application
  • Node.js
  • React
  • Solidify
  • Smart Contract
  • Hardhat
  • TypeScript
  • JavaScript
  • Ethereum
  • web3.js
  • Next.js
  • HTML
  • CSS
Abdul M.

Dubai, United Arab Emirates

$20/hr
4.9
74 jobs

Full stack developer building scalable web apps, blockchain solutions, and AI-powered platforms. Delivered crypto wallets, SaaS products, and Web3 applications using React, Node.js, and Solidity. ══════════════════════════════════ WHAT I BUILD ══════════════════════════════════ → Web Applications & SaaS Platforms Dashboards, admin panels, subscription systems, user portals → Blockchain & Web3 Solutions Crypto wallets, smart contracts, dApp frontends, token integrations → AI-Powered Features Chatbots, workflow automation, OpenAI integrations, intelligent systems → APIs & Backend Systems REST, GraphQL, secure authentication, scalable architecture ══════════════════════════════════ TECH STACK ══════════════════════════════════ Frontend: React • Next.js • TypeScript • Tailwind CSS Backend: Node.js • Express • NestJS • GraphQL • REST API Blockchain: Solidity • Web3.js • Ethers.js • Smart Contracts Database: PostgreSQL • MongoDB • Redis • Firebase AI: OpenAI API • LangChain • Python ══════════════════════════════════ WHY HIRE ME ══════════════════════════════════ ✓ Shipped crypto wallets handling real transactions ✓ Built SaaS platforms serving thousands of users ✓ Clean, maintainable, well-documented code ✓ Clear communication and on-time delivery ══════════════════════════════════ IDEAL PROJECTS ══════════════════════════════════ - SaaS & web application development - Blockchain & crypto wallet projects - AI feature integration - API development - Dashboard & admin panels - Web3 dApp frontends ══════════════════════════════════ Message me with your project details. I respond within 24 hours.

  • Blockchain
  • Blockchain Development
  • Hybrid App Development
  • Mobile App Development
  • Smart Contract
  • Solidity
  • TypeScript
  • Web Design
  • Web Development
  • Solana
  • Full-Stack Development
  • SaaS
  • Bitcoin
  • Crypto Wallet Development
  • Crypto Exchange Platform
  • React
  • Next.js
  • Node.js
  • FinTech
  • AI Trading

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