Fullstack Developer - AI-driven, agentic coding - Ho Chi Minh City, Vietnam

I build and ship full-stack products end to end - frontend, backend, and the infrastructure under them. My edge is AI-driven development: agentic coding with AI agents across the whole cycle, from design to deploy, to move fast without trading away correctness. TypeScript / React / Node.js / PostgreSQL.

• Building full-stack on a production CRM + course-commerce platform - I own the backend and the admin UI
• Working AI-driven - agentic coding and LLM tooling across the whole cycle, from design to deploy
• Shipping side projects, including a production AI agent I wrote from the loop up (zalo-agent)
• Open to full-stack / software engineering roles and conversations

An AI Agent (AI assistant) that lives inside Zalo and answers real people in real chats. One self-hosted deployment runs many accounts - each its own persona and toolset - so a business can point it straight at customers. It remembers people across months, searches documents you feed it (RAG), schedules follow-ups, and builds Word/Excel files and images on the fly. Self-written agent loop with its own tools, and layered prompt-injection defense with deliberately no money-moving tools - so it stays safe reading messages from strangers. Runs on your own server, not locked to any LLM vendor. Open source (MIT).

The full backend of a live virtual-office and coworking rental SaaS - one system serving a customer web app, an internal CRM, and a Zalo Mini App at once. Customers browse, book and manage office space end to end. Built to be trusted with real contracts and money: an accounting-grade, tamper-evident audit trail of every action, and booking and promotion logic that never oversells even under concurrent load.

Sole backend engineer for a company's live CRM and course-selling platform - real revenue, real customers. It takes payments and issues legally-binding Vietnamese e-invoices that always match what was actually paid, with no double-charging even when a bank webhook races a manual confirmation. Runs marketing and transactional email to ~11,000 recipients, and powers the internal CRM, a digital document library, and the landing pages that sell the courses.

A solo, full-stack video and audio streaming platform - web app, backend, a companion desktop app, and infrastructure. Its standout is in-content search: type a half-remembered line and jump to the exact moment in the right video (typo-tolerant), cut from 54 seconds to ~160ms by rethinking how transcripts are indexed. Role-based access with three privacy levels, a direct-to-storage upload pipeline, and a native desktop app (Electron + ffmpeg) for publishing multi-gigabyte files the browser can't. Engineered for discovery too, with structured data and SSR so AI answer engines can read and cite the content.

A browser translation tool with a real, happy user base - 330 users at 5.0 stars, maintained 16 months on the Chrome Web Store. Translate on hover, selection or right-click across 50+ languages, backed by a proxy that keeps it fast and dependable with server-side keys and automatic provider failover.

LinkedIn /in/haivv - haivv.se@gmail.com