HN.Dev
Open to Full-Stack & AI Engineering roles

Full-Stack Engineer building with Python, React & GenAI.

I'm Hong Nguyen — I design and ship AI-powered product features, from prompt-engineered LLM pipelines to production REST APIs. I've launched an iOS app with 18,900+ downloads and multiple live web applications.

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📍 San Jose, CA · hongnguyentt99@gmail.com · (408) 495-1048
Hong Nguyen
18.9k+ iOS App Downloads
4.7★ App Store Rating
5 Live Production Apps
2025 Meta Certified
CS50W HarvardX Certified
What I Work With

Technical Skills

Languages

Python (expert) JavaScript (ES6+) Swift SQL HTML5 CSS3

AI & LLM Engineering

Prompt Engineering Prompt Chaining OpenAI GPT API Google Gemini API Agentic Workflows AI Code Assistants

Backend

Django Django REST Framework REST API Design Authentication Relational Data Modeling PostgreSQL

Frontend

React Responsive UI Semantic HTML Cross-Browser Compatibility Bootstrap

Tooling & Delivery

Git / GitHub CI/CD Pipelines Netlify Render Neon (Postgres) PythonAnywhere GitHub Pages Code Review

Software Fundamentals

Data Structures Algorithms Design Patterns Object-Oriented Design

Currently Learning

TypeScript Next.js
My Journey

Professional Experience

2022 — Present

Full-Stack Developer

Freelance & Independent Projects — San Jose, CA

  • Prompt engineering: designed and iteratively refined prompt chains against OpenAI GPT and Google Gemini APIs to produce reliable structured output — powering a pipeline that parses uploaded PDFs into interactive flashcards and adaptive quizzes.
  • GenAI tooling: used AI code assistants across the full development lifecycle to generate, debug, and optimize code — personally reviewing, testing, and validating every change before release.
  • Feature development: designed, built, and launched NewUsCitizenshipTest, a citizenship-test prep iOS app in Swift with an offline 100-question civics bank, reaching 18,900+ downloads.
  • Platform expansion: shipped Passuscivics, an iOS + web citizenship-prep platform covering both official USCIS test formats with mock interviews, study modules, and multi-language support — built in JavaScript, deployed via Netlify CI/CD (passuscivics.com) for zero-downtime releases.
  • CI/CD: configured Netlify CI/CD for automated, zero-downtime production releases from a single git push, replacing manual deploys.
  • Backend & API design: built Django/DRF services with secure authentication, relational data models on PostgreSQL, and clean REST endpoints backing stateful client sessions.
  • Client delivery: delivered ephatachoir.org end to end — requirements, architecture, media asset routing, semantic HTML, and verified cross-browser consistency through launch.
2017 — 2019 · 2021 — 2022

Engineering Lab Technician

Western Digital — San Jose, CA

  • Built and validated experimental HDD prototypes against strict engineering specifications; documented outcomes in formal engineering build reports.
  • Partnered with engineering teams on troubleshooting, root-cause debugging, and quality validation workflows; managed critical component inventory for active builds.
2020 — 2021

Production Technician

Future Motion, Inc. — San Jose, CA

  • Operated manufacturing and test equipment — laser printing systems and mainboard, battery, and footpad sensor test rigs — inspecting assemblies against production specifications and escalating functional and process defects.
  • Contributed to new assembly procedures, custom tooling, and test methods.
Showcase

Featured Projects

NewUsCitizenshipTest app icon iOS App

NewUsCitizenshipTest

Citizenship-test prep iOS app built in Swift, reaching 18,900+ downloads, 4.7★. Offline quiz engine with a 100-question bank covering the N-400 civics questions plus reading and writing practice.

Swift iOS Offline-first
Download on the App Store ↗
PassUSCivics test-version selection screen iOS + Web ▶

PassUSCivics

Citizenship-prep platform supporting both official USCIS test formats (100- and 128-question), with N-400 mock interview practice, Reading/Writing/Vocabulary modules, a workbook, and multi-language support — deployed via Netlify CI/CD for zero-downtime releases.

JavaScript iOS + Web Netlify CI/CD
Visit site ↗ Download on the App Store ↗
AI Study Buddy AI Assistant ▶

AI Study Buddy

Full-stack AI learning assistant. A prompt-engineered pipeline parses uploaded PDFs into interactive flashcards and adaptive quizzes.

Django OpenAI API React
Live demo ↗
Hong Nguyen-twin AI chat GenAI

AI Chat App — “Hong Nguyen-twin”

A digital twin trained on my resume, running on Google Gemini with a custom persona prompt and a serverless REST proxy. It’s live on this page — bottom right.

Gemini API Netlify Functions Vanilla JS
Ephata Choir Portal homepage Client Work

Ephata Choir Portal

Multi-page platform delivered end to end for a community organization — I owned the architecture, media asset routing, implementation and production release.

JavaScript Responsive UI Media Routing
Visit site ↗ Download on the App Store ↗
E-Commerce Auction Platform E-Commerce ▶

E-Commerce Auction Platform

Live bidding, watchlists and secure authentication over complex relational data models with clean REST endpoints.

Django Auth SQL
Social Network Social Web ▶

Social Network

Full-featured social platform with profiles, posts, following and likes.

Python Django JavaScript
Encyclopedia Wiki Web Dev ▶

Encyclopedia Wiki

Markdown-to-HTML wiki system with a custom search engine and random article routing.

Python Django Markdown
Email Client API Integration ▶

Email Client

Single-page application for composing, archiving and replying to mail via a REST API.

JavaScript Django SPA
Google Search Clone UI/UX ▶

Google Search Clone

Pixel-accurate rebuild of Google’s search, image and advanced-search interfaces.

HTML CSS Design
Interactive Playground

Mini-Lab Collection

A series of utility apps and games built to explore frontend logic and user interface design.

Habit Tracker

Habit Tracker

Track your daily goals and build consistent routines.
Memory Cards

Memory Cards

Test your focus and memory with this interactive game.
Calculator

Calculator

A sleek, functional calculator with premium UI design.
Rock Paper Scissors

Rock Paper Scissors

Classic game logic with human-AI competition.
Dice Roller

Dice Roller

A simple physics-based simulation for tabletop games.
Coin Flip

Coin Flip

A digital decision-maker with smooth animations.
Pomodoro

Pomodoro Timer

Time management tool built for focus and productivity.
Quote Generator

Quote Generator

Randomly curated inspiration for your daily work.
Tic Tac Toe

Tic Tac Toe

AI-driven game of strategy and logic.
Explore More Repositories on GitHub

Let's Build Something Together

Whether you have a question or want to discuss a project, my inbox is always open.

✉️ Email Me 📱 (408) 495-1048 📄 Résumé 🔗 LinkedIn 💻 GitHub 📺 YouTube
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Hong

Hong Nguyen-twin

Have a nice day!