Chen Xu / Portfolio

AI brand visibility platform built end-to-end across product, frontend, backend, AI workflows, plans, and deployment.

• Concurrent checks across DeepSeek, ChatGPT, Kimi, and Gemini
• GEO site audit, Schema generation, and Wikidata knowledge graph health
• Stripe payments, plan limits, admin tooling, and GitHub Actions deployment

AI support and knowledge-base Q&A product for business content, customer replies, and site assistance.

• Knowledge-base Q&A experience for business content
• Supports visitor self-service and support-agent assistance
• Deployed independently at answerdesk.rankweave.top

A Web3 vertical AI search engine using RAG, LangChain, and Milvus for a Perplexity-like expert search experience.

• OpenAI / Llama2 multi-model integration
• Scheduled crawling from multiple documentation sources
• External projects including 0xScope adopted the API service

Core backend work for Web3 wallet systems and WLFI, covering auth, wallet generation, signing, and bridge architecture.

• Registration, login, wallet generation, and transaction signing
• Ethereum, Solana, Base, BSC, Tron, and Ton integrations
• Cross-chain asset exchange and high-availability backend design

A TON ecosystem Web3 data annotation product using AI-generated questions for acquisition, labeling, and datasets.

• Reached 30K users in the first week and 70K cumulatively
• Received TON official grants
• Partnered with RootData, HashKey, and other organizations

An on-chain relationship graph aggregating ETH blocks, TheGraph, .bit, and other data sources.

• Aggregated ETH blocks, TheGraph, .bit, and other sources
• Built wallet relationship discovery and visualization
• Supported graph-style querying for a Web3 data platform

Enterprise infrastructure across a NestJS BFF framework, shared services, Kubernetes, and ELK logging.

• Built a reusable NestJS BFF framework with Redis, MySQL, encryption, signing, and proxy modules
• Created shared services including short links, verification codes, and Excel-to-PDF
• Rolled out Docker / Kubernetes and an ELK frontend logging pipeline

Built a team and delivered a microservice architecture that supported a large event campaign.

• Delivered a product from zero to launch
• Implemented Kong API Gateway and ELK logging
• Supported a Budweiser event campaign at peak QPS 400 with stable operation

Early Node.js backend and platform work across Qixinbao app services and shared service platforms.

• Developed backend services and core business iterations for Qixinbao app
• Designed base frameworks, project structure conventions, and shared utilities
• Built shared service platforms and handled difficult production issues