poseidon0990

Architected and deployed Ethereum and Polygon dApps using Solidity, Hardhat, and Ethers.js, serving thousands of active users. Built a full-stack NFT marketplace with Next.js and IPFS, implementing ERC 721/1155 standards and enabling secure transactions. Integrated WalletConnect and MetaMask authentication across platforms, enhancing user onboarding and retention. Developed internal on-chain analytics tools using TheGraph, reducing manual reporting time by 10%. Oversaw CI/CD pipelines and smart contract testing on testnets, improving deployment reliability and reducing rollback incidents by 30%.

Developed DeFi interfaces (staking, yield farming) with Vue.js, Web3.js, and Solidity, supporting multiple high-value client projects. Integrated RESTful APIs with smart contract events, streamlining backend/frontend communication for DeFi applications. Led tokenomics simulations and launched ERC-20 tokens, facilitating token distribution to thousands of users. Audited and optimized gas usage, achieving average cost reductions of 25% per transaction. Built a blockchain explorer clone with real-time block and event tracking using Node.js and MongoDB, improving transparency.

Contributed to fintech product development, including crypto wallets, exchanges, and KYC workflows for enterprise clients. Built RESTful APIs using Node.js and PostgreSQL, adding real-time functionality with Socket.IO. Integrated third-party APIs (CoinGecko, Chainlink, Alchemy) for pricing, randomness, and on-chain data. Developed React Native mobile wallets for iOS/Android, enabling secure Ethereum transaction signing via WalletConnect. Introduced unit and integration testing with Jest and Mocha, improving code reliability and reducing production bugs.

Assisted in development of smart contracts and frontends for Ethereum-based games. Wrote scripts to automate token airdrops and track wallet engagement. Built early prototypes for DAO-style voting systems using Solidity and React. Gained experience with Truffle, Ganache, and Remix IDE.