Nguyen Truong
Nhat Hao

Backend developer based in Ho Chi Minh City. I build APIs that work, care about the details, and like knowing how things perform under pressure.

Ho Chi Minh City, VN

HUFLIT · Software Engineering

View Projects Get in Touch

RPS ~25k req/s

p99 3.2 ms

Tests 20 Jest

Conns 10k+

vs wrk +18% RPS

vs hey +41% RPS

accuracy HDR exact

Backend developer with experience in Node.js, TypeScript, and Python. I've worked on accounting and inventory systems during a production internship, and built personal projects ranging from a full e-commerce platform to a CLI load-testing tool.

I like owning a problem completely — from the database schema to the API to making sure it actually performs. I'm detail-oriented, not in a pedantic way, just in a "this should work correctly" way.

Looking for a Backend Engineer role in Ho Chi Minh City.

Backend

Node.js Express.js Prisma Django DRF JWT REST API

Databases

PostgreSQL MongoDB Microsoft SQL Server Redis

Languages

TypeScript JavaScript (ES6+) Python

Infra & Tooling

Docker Git / GitHub Celery Elasticsearch Postman

Frontend (supporting)

React Next.js TailwindCSS HTML / CSS

ACCOUNTING

Built the General Journal module end-to-end — database schema through UI — implementing double-entry bookkeeping logic that handles multi-currency transactions and document attachments with Prisma and Node.js.

INVENTORY

Built a real-time inventory dashboard with Next.js and TanStack Query, letting warehouse staff verify export vouchers and track goods-in-transit status, reducing inventory discrepancies.

REFACTOR

Re-architected the legacy promotion system to support dynamic product/gift selection and combo deals, improving maintainability and fixing critical bugs in the discount calculation flow.

DATA INTEGRITY

Implemented strict decimal and unit-of-measure validation across POS and Order modules to prevent rounding errors in financial reports.

Built in Node.js/TypeScript, supports 10,000+ concurrent connections via Undici, reporting accurate p50–p99 latency percentiles via HDR Histogram.
Ramp-up mode prevents thundering-herd spikes at test start. Live terminal progress bar shows RPS, p99, and error rate in real time.
Promise-based FIFO semaphore for concurrency control. Modular architecture: Runner / Worker / MetricsCollector / Reporter. JSON/CSV export.
Benchmarked against wrk, hey, and autocannon: ~25,000 req/s — the only tool in the comparison with exact (not approximate) percentile accuracy.
20 Jest unit tests. ESLint, Prettier, Commitlint enforced throughout.

TypeScript Node.js Undici HDR Histogram Commander.js Jest

// BENCHMARK — req/s (higher is better)

b3lance

25,000

wrk

21,200

autocannon

20,500

hey

17,700

⚑ Only b3lance-load uses HDR Histogram
for exact (non-approximate) percentile accuracy

Data ingestion and enrichment pipelines from IMDb, MovieLens, and TMDB; background processing via Celery/Redis; metadata indexed in Elasticsearch for real-time search and autocomplete.
Hybrid recommendation system combining collaborative and demographic filtering (KMeans, MiniBatchKMeans, DBSCAN) with offline training and scheduled refresh jobs.
Performant React frontend: Redux, infinite scrolling, code-splitting, lazy loading, i18n for large catalogs.
PayPal webhook integration and Google OAuth2; JWT authentication throughout.

Django DRF PostgreSQL Redis Celery Elasticsearch React scikit-learn

Full shopping experience: product catalog, cart, PayPal checkout, order tracking, vouchers, and PDF invoice downloads.
Admin panel for product, order, and inventory management with sales reporting and CSV/PDF exports.
JWT authentication, Cloudinary image hosting, and a built-in support chatbot. Scheduled jobs via node-cron.
Responsive React frontend with CSS Modules, React Router, and Axios.

React Node.js Express MongoDB JWT Cloudinary PayPal

SCHEMA

Design data models before writing a line of business logic.

MEASURE

Benchmark the system, then document the numbers — not just "it's fast."

OWN IT

End-to-end ownership: schema → API → tests → deploy.