MAJORKARTHIK M.Private profile: Upwork shows its earnings only to signed-in members, so we check it every few weeks, not daily. MRR here is a rough estimate (Upwork's six-month earnings ÷ months active). Last read Nov 5, 2026.

My expertise spans blockchain development, web & mobile app development, and cloud solutions, backed by a proven track record of delivering innovative, scalable, and secure digital solutions across various industries.With over 13+ years of professional hands-on experience, I have established myself as a Top-Rated Freelancer with a ★★★★★ 5-star feedback rating and 100% job success. My Approach & Challenges Open to exploring latest tech stacks like Web3.js, Ethers.js, zk-Rollups, cross-chain bridges, and blockchain interoperability solutions. Passionate about solving complex challenges such as scalability of blockchain networks, secure decentralized mining pools, and interoperability across heterogeneous blockchains. Dedicated to delivering robust, scalable platforms while adhering to best practices in security, performance, and UI/UX design. Blockchain Technologies & Cryptocurrency Expertise Blockchain Platforms & Protocols: Hyperledger Fabric & Explorer, Stellar, Algorand, Solana, Corda, Ethereum Smart Contract & Token Development: ERC20, ERC721, ERC1155, Chaincode, Solidity, Web3.js, Truffle, OpenZeppelin Decentralized Applications (dApps): Design and deployment of NFT Marketplaces, NFT Wallets, NFT Minting Platforms, and digital asset management Layer 2 Scaling & Sidechains: Implementation of Layer 2 solutions such as Rollups (zk-Rollup, Optimistic), State Channels, Plasma, and **Polygon (Matic] for blockchain scalability, interoperability, and high-throughput transaction processing Cryptocurrency & Mining Infrastructure: Expertise in Pool Mining and Merge (Auxiliary Proof-of-Work) mining for secure, decentralized crypto mining pools, supporting Bitcoin, Litecoin, Nano, Ripple, and other POW-based cryptocurrencies. Specialized in setting up decentralized mining pools, hash power sharing, and payout mechanisms—PPLNS, PPS for maximum efficiency and security. Cross-Chain & Interoperability: Polkadot, Cosmos SDK, Chainlink Oracles for blockchain interoperability and cross chains Web & Mobile App Development Full-Stack Web Development: HTML5, CSS3, JavaScript, JQuery, Ajax, AngularJS, React.js, Node.js Backend Development: PHP (Laravel, CakePHP, CodeIgniter), Python (Django, Flask), RESTful API integration, Microservices, Docker & Kubernetes, AWS cloud hosting (EC2, S3, Lambda, CloudFormation) Mobile & Cross-Platform Apps: Native Android (Java, Android SDK), Native iOS (Swift, Objective C), Hybrid Apps (React Native, Ionic, Cordova, Flutter). Skilled in UI/UX design, app mockups, push notifications, media streaming, and AR/VR integrations. Emerging & Modern Technologies: Open to adopting new tech stacks like blockchain SDKs, decentralized identity solutions, cryptocurrency wallet development, machine learning APIs, and edge computing challenges. Cloud & DevOps Cloud Platforms: AWS (EC2, S3, Lambda, RDS, EKS), Google Cloud, Azure, DigitalOcean DevOps & CI/CD: Docker, Kubernetes, Jenkins, Terraform, Helm, CloudWatch, Monitoring, Auto Scaling, Serverless Frameworks Containers & Microservices: Expertise deploying fault-tolerant microservices in cloud-hosted environments with container orchestration. Other Skills & Integrations Payment Gateways: PayPal, Stripe, Authorize.net, Venmo, Braintree, Payleap, P2P Crypto Payments (Bitcoin, Guldencoin, HiveWallet, BreadWallet) Web Services & APIs: XML/JSON, REST, SOAP, Google Maps, Foursquare, GPS, OpenStreetMap Game & AR/VR Content: Experience in 3D content pipeline, AR/VR SDKs (Google Vision, Vuforia), Unity3D, Unreal Engine, and 3D modeling tools like Maya & Blender. If you're looking for a blockchain expert with full-stack web & mobile development experience and a solid understanding of cryptocurrency mining, sidechains, and scalable, secure blockchain architectures, let's connect! I am always excited to embrace new challenges and latest innovations within this dynamic space. Thank you, ~ Karthik