pennchen

Frontend engineer with 5+ years of production experience and a bachelor’s degree in Software Engineering. Frontend engineering is my core strength, with a focus on React, Next.js, TypeScript, JavaScript, HTML, and CSS. I have experience in complex interactions, real-time state management, performance optimization, responsive interfaces, and frontend architecture. I can independently deliver features from requirement analysis and technical design to API integration, testing, and production release.

I also have full-stack Web3 and AI development experience. On the backend, I work with Node.js, Express, Next.js server APIs, REST APIs, Supabase, PostgreSQL, SQLite, authentication, access control, and server deployment. For AI applications, I have experience with LLM APIs, SSE streaming, tool calling, context management, and failure handling.

In Web3, I work with the EVM ecosystem, ethers.js, viem, wagmi, Solidity, and Hardhat. My experience covers wallet connections, message signing, authorization, contract interactions, transaction states, idempotent requests, and on-chain data interfaces.

I am the Owner and full-stack developer of AgentPay, an AI payment agent built with Cobo Agentic Wallet. The project won second place in the Cobo Track at the AI × Web3 School Agentic Hackathon. I implemented Pact-based authorization, pact-scoped keys, requestId-based idempotency, and testnet proof records, connecting natural-language tasks, user approval, on-chain execution, and auditable transaction history.

I also have production experience with Tencent Cloud TRTC and MQTT for real-time IoT video calling, including weak-network reconnection and failure recovery. At GRG Banking Equipment, I contributed to the Shenzhen Metro online ticketing system, covering identity verification, ticket purchasing, payments, invoicing, and administration workflows.

Portfolio: https://penn.rocchan.online/
AgentPay: https://agenticpay.rocchan.online/
Award announcement: https://mp.weixin.qq.com/s/OYaTDC1InraNjlaHvv2z5Q