Dhiraj C.

Need a secure Solidity contract, DeFi module, or crypto payment backend for real transactions? I build production-ready Web3 systems with safe wallet flows and reliable APIs. Most Web3 problems do not come from code that simply fails to compile. They come from weak transaction handling, unsafe smart contract logic, poor wallet-state validation, broken backend sync, missing tests, and rushed deployment. That is where I help. I work with founders, CTOs, startups, and product teams building Web3, DeFi, fintech, crypto payment, and backend-heavy products. My focus is secure architecture, clean implementation, and production reliability. What I can build for you: • Solidity smart contracts for ERC-20, ERC-721, ERC-1155, staking, vesting, escrow, token launches, bonding curves, and DeFi logic • Web3 backends using Node.js, NestJS, TypeScript, PostgreSQL, Redis, Docker, AWS, Nginx, and CI/CD • Crypto payment systems with USDT escrow flows, wallet dashboards, deposits, withdrawals, transaction tracking, and admin controls • DeFi platforms with token swaps, fair-launch flows, bonding curves, liquidity automation, and real-time pricing • dApp integrations with React, Next.js, MetaMask, Ethers.js, Web3.js, Wagmi, RainbowKit, and smart contract event handling • Production support including smart contract review, gas optimization, API cleanup, backend hardening, deployment, monitoring, and documentation Proof: • 100% Job Success on Upwork • Rising Talent status • $10K+ Upwork earnings • 414+ Upwork hours • CEH-certified security background • Built Web3 systems across USDT escrow, ERC-20 swaps, fair-launch token platforms, NFT marketplaces, SaaS backends, wallet flows, and transaction-heavy APIs Client feedback: “Delivered production-ready code with no hand-holding.” “Technically strong in blockchain concepts and proactive in solving issues.” “Delivered clean, well-structured code on time.” Core stack: Solidity, Ethereum, Polygon, Arbitrum, Base, Hardhat, Foundry, OpenZeppelin, Ethers.js, Web3.js, Wagmi, MetaMask, IPFS, Chainlink, Node.js, NestJS, TypeScript, PostgreSQL, Redis, Docker, AWS, Nginx, CI/CD, React, Next.js. Send me what you are building, what is already done, and where the risk is. I will help you define the safest technical path and build a stable Web3 system around it.