Frontend with architecture
Large surfaces, many roles, many languages — still readable six months later.
- React 19 · Next.js
- Strict TypeScript
- Zustand · TanStack Query
- i18n JA/EN/VI
Employed full-time · open to part-time projects
Fullstack Developer · Ho Chi Minh City
Nguyen Viet Hoang
- React & TypeScript
- Go · Hono · FastAPI
- Systems in production
I build web products that actually run — from an enterprise AI-agent platform for Japanese companies to an online exam system more than 500 Vietnamese teachers use every day.
500+teachers using iExam every day
3products I built and run myself
2enterprise platforms for Japanese clients
1+year building software people use daily
01
About
Final-year student — and eighteen months of shipping to production.
I am a fourth-year Software Engineering student at Industrial University of Ho Chi Minh City (IUH). Since 2025 I have worked fullstack at HDC Flowtech on M-Agent (MOSA) — an AI agent and workflow automation platform for Japanese enterprise clients — owning all three frontend modules and three backend services while leading a team of two.
Outside work I design, write and operate my own systems: iExam runs real exams for more than 500 teachers, BCN Judge grades club submissions, and a conduct-tracking system runs at a high school — all three are in daily use. I like the hard parts users never see: binary parsers, sandboxes, safe migrations, and a test suite thick enough that pressing deploy is not a gamble.
- Education
- Industrial University of Ho Chi Minh City (IUH)B.Eng. Software Engineering — fourth year2023 — Present
- Relevant coursework: Data Structures & Algorithms, Web Programming, Database Systems, Operating Systems, Computer Networks, Software Engineering.
Backend and infrastructure
Services I write, deploy and get paged for when they fall over at midnight.
- Go · gRPC · Protobuf
- Hono · Drizzle · Postgres
- Python FastAPI
- Docker · GitLab CI/CD
Hard problem domains
The work with no library waiting for it: binary formats, grading, anti-cheat.
- MathType MTEF/OLE → LaTeX
- Docker grading sandbox
- Exam anti-cheat
- KaTeX · TipTap · XYFlow
02
Experience
One company, two enterprise products for the Japanese market.
HDC Flowtech
Fullstack Developer
2025 — PresentHo Chi Minh City
Building AI products for the Japanese market: fullstack across frontend and backend, plus team lead for two developers.
- Developed frontend for three modules — Admin Console, User Portal and Superadmin Dashboard — using React 19, TypeScript, Vite and Tailwind CSS, with an automated test suite gating every release.
- Developed a visual Workflow Builder (XYFlow) enabling drag-and-drop automation pipelines connecting Gmail, Google Drive, Telegram, Zoho, Chatwork, Jira and GitLab via OAuth2.
- Implemented Credit Management (BigInt precision, SVG dashboards, CSV export), Chat AI (streaming, file preview, scroll optimisation), 2FA authentication and i18n (Japanese/English) across all modules.
- Led a team of 2 developers: assigned tasks via Jira, reviewed merge requests and mentored on frontend code standards.
- Managed CI/CD with GitLab pipelines, Docker and Husky; maintained a main/staging/dev branching strategy with tag-based releases.
Products I worked on
M-Agent (MOSA)
Private / enterpriseEnterprise AI agent & workflow automation platform for Japan
A platform that lets companies assemble AI-powered automation workflows across email, cloud storage, CRM and messaging services.
- Drag-and-drop Workflow Builder on XYFlow and an OAuth2 connector system covering 7+ providers.
- Credit Management with BigInt precision, hand-drawn SVG charts and CSV export.
- Streaming Chat AI with file preview, plus two-factor authentication.
- Served Japanese enterprise clients (Eigyo DX, Kunii) with full JA/EN localisation.
- 2
- Japanese enterprise clients on it
- 7+
- outside services wired into one workflow
- 3 + 3
- frontend modules / backend services I own
- React 19
- TypeScript
- Go
- gRPC
- Hono
- FastAPI
- Docker
- GitLab CI
MRAG (Musashino)
Private / enterpriseRAG knowledge platform
A Retrieval-Augmented Generation platform with admin and user portals for managing knowledge collections, use cases and AI chat.
- Hybrid Builder: Google Drive import with per-slide PPTX selection.
- File Manager with sharing, permissions and Supervisor roles.
- Slide and poster generation from chat, MCBuilder watermark settings, dashboard CSV export.
- An embeddable chat widget (mrag-embed) in Preact + Vite, deployed to Google Cloud Storage.
- 3
- portals
- JA/EN
- localised end to end
- Next.js 15
- React 19
- TypeScript
- FastAPI
- Tailwind CSS
- Radix UI
- DnD Kit
03
Personal projects
My own brief, my own design, my own code, my own deploy — and my own pager.
iExam
Live in productionOnline exam platform built for mathematics
An exam platform now used by over 500 teachers, built specifically for maths papers: LaTeX rendered with KaTeX, the three question types Vietnamese exams use, and live progress tracking while students sit the test.
- Three roles — admin, teacher, anonymous student — and three question types: multiple choice, four-proposition true/false, short answer.
- Anti-cheat: tab-switch and window-blur detection, copy blocking, and a recorded violation count per attempt.
- Four framework-free shared engines: MTEF parser, editor, TikZ parser and TeX parser.
- Works on the old laptops and phones students actually bring: every incident we hit in the wild is encoded as a rule that blocks it from recurring.
- Blue-green deploys to a self-managed VPS through GitHub Actions, with smoke tests before the switch.
- 500+
- teachers using it
- Instant
- marking the moment a student submits
- 06/2026
- running in production since
- React 19
- Vite 8
- TypeScript
- Tailwind v4
- Zustand
- Hono
- Drizzle
- PostgreSQL
- KaTeX
BCN Judge
Live in productionA club online judge grading inside Docker sandboxes
An internal programming judge: organisers publish problems per course, members code in the browser, submissions are graded automatically against testcases, and weekly contests have a freezing scoreboard.
- A judge worker runs every submission in its own Docker container with time, memory and disk-write limits.
- Weekly contests with standings, tie-break rules, an end-of-contest freeze and practice mode afterwards.
- Teams and leaders: a leader follows their own team’s progress and submissions; Discord login.
- Member-facing data leaves only through a serializer layer — forbidden fields are typed `never`, so leaking an answer is a compile error.
- Hand-written, additive-only migrations with a guard script that blocks unsafe ones before deploy.
- Instant
- grading and feedback on submit
- Weekly
- contests with a live scoreboard
- Discord
- login, no new account needed
- React 19
- Vite
- Tailwind v4
- Hono
- Drizzle
- PostgreSQL 17
- dockerode
- MinIO
- Playwright
Tong Lenh School Conduct System
Live in productionA PWA for school-wide conduct and merit tracking
A rebuild of a high school’s conduct-and-merit system as a React PWA on clean architecture, dropping the original’s Firebase dependency entirely.
- Red-flag scoring, duty rosters, class logbooks, student QR scanning and Youth Union workflows, all usable on a phone.
- Pure domain rules and data contracts live in `shared/`, used by both client and server.
- Six feature inventories of the legacy system act as the migration checklist.
- Visual identity in the Ho Chi Minh Communist Youth Union style, with the badge and flag rebuilt as vectors.
- Mobile
- scoring done in the classroom
- QR scan
- pull up any student on the spot
- 1 app
- monitors, day book and union duties
- React 19
- Vite
- Tailwind v4
- PWA
- Hono
- Drizzle
- PostgreSQL 17
04
Skills
The things I have used enough to take a job on.
01Frontend
- React 19
- Next.js 15/16
- TypeScript
- Vite
- Astro
- Tailwind CSS v3/v4
- Zustand
- TanStack Query
- React Router
- Radix UI
- Framer Motion
02Backend
- Go (Golang)
- gRPC · Protobuf
- Hono
- Python · FastAPI
- Node.js
- REST APIs
- Microservice architecture
- PostgreSQL · Drizzle · Prisma
03Specialised libraries
- XYFlow
- Three.js
- Recharts · ApexCharts
- TipTap · Milkdown · Lexical
- DnD Kit
- FullCalendar
- Mermaid
- KaTeX
- PDF.js
04DevOps & tooling
- Docker
- GitLab CI/CD
- GitHub Actions
- Git
- Husky · commitlint
- ESLint · Prettier
- Vitest · Playwright
- Sentry
- MinIO
05Process
- Jira
- Agile / Scrum
- Code review · merge requests
- Spec and design before code
- Leading a small team
06Languages
- Vietnamese (native)
- English (technical reading and writing)
05
Contact
Open to part-time and freelance work.
I work full-time at HDC Flowtech, so I only take on part-time or freelance work — usually small-scale projects, frontend or backend alike. Send me the scope and the timeline; I reply the same day.
hoangnguyen1157@gmail.com