Usman

Senior Blockchain Engineer

The Game Company • Vollzeit

Nov 2022 - Present • 3 yrs 6 mos

Architected and deployed comprehensive Web3 gaming infrastructure integrating smart contracts with centralized backend services to bridge Web 2.0 and Web 3.0 gaming experiences. - Smart Contract Development: Designed and deployed 15+ production-ready smart contracts including ERC20 token (GMRT), staking mechanisms with APR calculations, tournament management systems, time-exchange protocols, and session management contracts using Solidity, Hardhat, and Foundry on Base and Arbitrum networks. - Staking & Tournament Systems: Built advanced staking contract with dynamic APR calculations, prediction percentages, configurable stake limits (100-20,000 GMRT), admin approval workflows, entry fee distribution (33% winners/treasury/organizer), and reward claiming mechanisms supporting both team-based and player-based tournaments. - Backend Integration: Developed Node.js/NestJS backend services with RabbitMQ queuing for blockchain interactions, processing 500+ simultaneous transactions, implementing JWT authentication, TypeORM database management, and RESTful APIs for smart contract integration. - Multi-Chain Architecture: Implemented cross-chain payment handlers supporting Ethereum, Polygon, Arbitrum, and Base networks with single wallet depositor functionality, gas optimization strategies, and transaction monitoring systems. - Testing & Security: Conducted comprehensive testing using Mocha/Chai/Hardhat achieving 95%+ code coverage, performed security audits, implemented ReentrancyGuard patterns, AccessControl role management, and emergency withdrawal mechanisms.

Blockchain Engineer

Ekkel AI • Vollzeit

Dec 2017 - Nov 2022 • 4 yrs 11 mos

Developed and deployed 20+ production smart contracts for NFT marketplaces, DeFi protocols, and cryptocurrency exchanges with focus on scalability and gas optimization. - NFT Infrastructure: Architected and deployed 21 NFT collections using factory pattern for ImmutableType decentralized journalism platform (3 on Ethereum mainnet, 18 on Polygon mainnet) with IPFS/Pinata integration for metadata storage and censorship-resistant content delivery. - DeFi Exchange Development: Built FuzionX cryptocurrency exchange backend with real-time price feeds for 150+ trading pairs, implementing WebSocket connections to external market data providers, order matching algorithms, and liquidity pool management. - API Optimization: Enhanced API response times by 20% through Redis caching strategies, request batching, and rate limit optimization, handling 10,000+ requests per minute with 99.9% uptime. - Smart Contract Integration: Developed Node.js/Express APIs for smart contract interactions using Ethers.js, implementing event listeners, transaction monitoring, and automated retry mechanisms for failed transactions.