Design, build, and maintain scalable full-stack applications using React, TypeScript, and Node.js. Contribute to architecture decisions for front-end and back-end systems. Integrate with Web3 technologies (smart contracts, wallets, blockchain APIs, etc.). Ensure performance, security, and reliability across distributed systems. Collaborate cross-functionally with design, product, and leadership. Participate in code reviews, technical discussions, and mentorship of junior engineers.