Hi, my name is

Nguyen Van Hien

I am Fullstack Software Engineer

Fullstack Software Engineer experienced in building Web, Mobile, Automation and AI systems. I own nearly the entire product lifecycle: code → deploy → operate → automation → AI integration.

Get in touch View skills

SYS.ONLINE

CORE.STABLE

OPEN TO WORK

10+

In-depth skill areas

Database systems

30+

Technologies & tools

Years of Experience

About me

I work at the intersection of Fullstack Developer, DevOps, Automation Engineer and AI Integrator — not just plain web development.

I can design system architecture, build backend APIs, deploy Linux/VPS infrastructure, Docker, Nginx, HAProxy, Cloudflare and operate self-hosted services. Hands-on experience with Ecommerce, Automation Testing, Browser Automation, OCR/TTS/ASR, AI Integration, Database Optimization, Mail Server Infrastructure and Browser Fingerprinting.

My strength is not a specific framework, but the ability to handle nearly the entire product lifecycle — from idea to stable operation in production.

Information

Nguyen Van Hien
Fullstack Software Engineer
Vietnam
hadesker.net
Vietnamese, English

Core competencies

Skill areas built through real-world projects, from system architecture to AI infrastructure.

Frontend Engineering

Redux Zustand TanStack Query Tailwind CSS shadcn/ui Zod Ant Design Responsive Design Auth (JWT/OAuth) Lazy Loading Memoization i18n (Multi-language)

System Architecture

Microservices RESTful API Event-driven API Gateway Load Balancing Multi-tenant Architecture Caching (Redis) Queue Processing

DevOps & Infrastructure

Docker / Compose Multi-stage Build Ubuntu Server Systemd SSH Hardening Firewall HAProxy Nginx LB Caddy VPN / Tailscale

Cloud & Hosting

VPS Management Self-hosted Infra Cloudflare DNS Cloudflare Tunnel Zero Trust CDN / WAF SSL Management

Automation Engineering

STRENGTH

Puppeteer Playwright Selenium Web Scraping Data Crawling Browser Fingerprint Proxy Management Session Isolation

AI Engineering

LLM Integration OpenAI / Claude / Gemini Self-hosted Models GPU Deployment OCR / ASR / TTS RAG / Embedding Vector Database

Backend Engineering

REST API WebSocket JWT / OAuth2 RBAC Rate Limiting CSRF/XSS Prevention Horizontal Scaling

Database Engineering

PostgreSQL MongoDB MySQL Redis Data Modeling Query Optimization Backup & Recovery

Mail Infrastructure

RARE

SMTP / IMAP DKIM / SPF / DMARC Mail Deliverability Email Reputation Self-hosted Mail

Security & Cyber

Web Security Session Security Bot Detection Server Hardening SSL/TLS Security Fingerprinting

Product Engineering

Ecommerce Platform SaaS Development Internal Enterprise Tools Utility Applications Browser Extensions AI-powered Applications

Competency distribution

100%

Automation & Anti-Detection 25%

Backend / API Development 20%

Database Engineering 15%

DevOps / Linux Infrastructure 15%

System Architecture 15%

AI Integration & Deployment 10%

Highlighted experience

High-traffic Ecommerce system

Designed an Ecommerce system serving many concurrent users with Redis cache, Nginx reverse proxy, PostgreSQL and background workers. Optimized queries, indexing and caching strategy.

Redis Nginx PostgreSQL Queue Workers

Browser Automation & Anti-Detection platform

Built a large-scale automation system with Puppeteer/Playwright, managing browser fingerprints, proxies, session isolation and scheduled automation for data crawling/extraction.

Puppeteer Playwright Fingerprint Proxy

Self-hosted AI services deployment

Deployed AI models on dedicated GPU infrastructure: OCR, ASR, TTS, Background Removal, inference servers and integrated LLMs (OpenAI, Claude, Gemini) into real applications, including RAG with vector databases.

GPU Inference RAG LLM APIs

Self-operated Mail Server infrastructure

Self-hosted and operated a complete mail server: SMTP, IMAP, DKIM, SPF, DMARC, optimizing deliverability and email reputation for domain-based email infrastructure.

SMTP DKIM SPF DMARC

Mobile App Development (React Native)

Built cross-platform mobile applications using React Native, deployed to Google Play Store and Apple App Store. Experienced in handling store rejection cases, securing connections (SSL Pinning), protecting in-app data, preventing Man-in-the-Middle session hijacking attacks, and implementing Deep Links on both mobile and server sides.

React Native Play Store App Store SSL Pinning Deep Link

Suitable roles & direction

Technical Lead (5-15 people)

Lead development teams, design system architecture, and ensure technical quality across the product lifecycle.

Founding Engineer

Build products from scratch, iterate fast, and lay the technical foundation for new businesses.

Solutions Architect

Design scalable, high-performance, and cost-effective system architectures for complex applications.

Senior Automation Engineer

Develop and maintain robust automation frameworks, data crawling systems, and anti-detection platforms.

Fullstack + DevOps Engineer

Handle both backend/frontend development and manage infrastructure, deployments, and CI/CD pipelines.

AI Application Engineer

Integrate LLMs, vector databases, and AI models into real-world applications to deliver smart features.

Indie Hacker

Independently build, launch, and operate profitable micro-SaaS and utility products.

Platform Engineer

Build internal developer platforms, optimize infrastructure, and ensure system reliability and observability.

Programming languages

Proficient

Read source code well, write new features, refactor, and fix profound bugs.

PHP

Laravel/Laravel Octane + FrankenPHP

JavaScript/TypeScript

NextJs, NestJs, ExpressJs, ReactJs, React Native

Windows Forms

Python

FastAPI, AI deployment & operation

Familiar with / Have maintained

Able to read and understand code to a certain degree, or deploy/maintain legacy projects.

C/C++

Maintain open-source projects (Firefox custom build with fake fingerprint/proxy)

Java

Android app development

Swift

SwiftUI for iOS & macOS

Rust

Cross-platform apps via Tauri

Other skills

Familiarity with query languages and scripting.

Shell Scripts

Bash/Zsh, Automation scripts

CSS/Tailwind

Styling & UI libraries

SQL Queries

PostgreSQL, MySQL optimizations

Featured Projects

Some recent projects I have built, ranging from AI applications to utility tools and full enterprise platforms.

HIAS Chat

Smart AI Chat application integrated with advanced language models.

Hietek

Technology services and enterprise IT solutions platform.

HotAI

Comprehensive AI tools and infrastructure development suite.

Ifconfig.asia

Network utility tool for IP, DNS, and User-Agent checking.

Shorto.asia

High-performance URL shortener service.

Mắt Việt

Specialized e-commerce and retail data platform.

2FA Faster

Secure and fast 2FA authenticator code generator utility.

BG HotAI

Automated background removal tool powered by AI.

Dictionary Faster

Fast, multilingual dictionary web application.

Cropee.vn

Platform for agricultural and crop management solutions.

WaoRabbit

E-commerce and Booking platform with modern architecture.

TN7Edu

English center and training/job networking ecosystem.

...and many other private projects.

07. What's next?

Let's work together!

I am always open to exciting collaboration opportunities — from building new products and optimizing infrastructure to integrating AI into existing systems. My inbox is always open.