Công Hải

Built a responsive marketing page from Figma using React, supporting desktop and mobile layouts.
Implemented secure wallet authentication for a dApp on Sepolia using wagmi, viem, and SIWE.
Developed 3 core blockchain operations: token transfers, NFT minting, and ERC-20 token creation using wagmi and viem, with gas estimation and balance validation.

Enhanced authorization in the project management system (PMS) from RBAC to PBAC using a permission matrix for action-level access control.
Implemented AI-powered Meeting Notes, generating summaries and transcripts from audio files with loading and error handling.
Built an audit logging system using middleware on relevant endpoints, improving task traceability and accountability in the PMS.
Developed global full-text search using MongoDB text indexes, achieving approximately 100ms response time.
Reduced admin dashboard response time from 3s to 200ms by resolving N+1 queries, improving system performance.

Built an end-to-end full-stack CMS using React, React Router, Express.js, and MongoDB, integrating frontend and backend workflows.
Implemented JWT authentication and RBAC, securing CMS endpoints with role-based permissions.
Integrated Cloudinary for centralized media uploads, storage, and management.
Implemented i18n for static and dynamic content, supporting 2 languages: English and Vietnamese.

Welcome to Cong Hai's Portfolio