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Do Trong Khanh · Software Engineer at Spartan

Fullstack engineer with a passion for JavaScript/TypeScript. I write about NestJS, databases and the problems that show up when applications grow, to practise my skills and share what I learn.

I'm aliased as Karhdo at work.

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Latest post

How to Prevent Overbooking in SQL with Multiple Methods

In any application involving booking hotel rooms, flight seats, or similar resources, data integrity is crucial to ensure multiple users can’t “claim” the same slot concurrently.

5 min readdatabase

Daily stack, 14 tools

  • TypeScript
  • NestJS
  • React
  • Node.js
  • Next.js
  • Astro
  • PostgreSQL
  • Bun
  • Tailwind CSS
  • Drizzle
  • RabbitMQ
  • Docker
  • Vue.js
  • Redis

Now learning Astro & Bun by rebuilding this site

GitHub · @Karhdo

contributions
day streak
public repos

Blog stats · 30 days

Selected projects

All 5 projects →

WorkYouNet Media

EcomHeat

The first e-commerce data intelligence platform in Vietnam. Brands track market share, monitor sales performance and optimise store operations with the most granular data available.

  • Market shareacross marketplaces
  • Competitorresearch tools
  • Fullstackmy role
  • React
  • Bootstrap
  • FeathersJS
  • MySQL
  • RabbitMQ
Visit product
youneteci.com/eci-ecomheat
EcomHeat market overview dashboard: sold items, GMV and market share by brand
karhdo.dev
The karhdo.dev blog home page

SideOpen source78 GitHub stars

karhdo.dev

This site. v2 moves from Next.js to Astro with Bun, Tailwind v4, Drizzle and view transitions.

  • Astro
  • Bun
  • Tailwind
  • Drizzle
Source code →
github.com/Karhdo/geometry-simulation
A wireframe sphere casting a shadow on a 3D grid, with camera and light controls

Side3D on the web

Simulate Basic Geometry

Explore the World of Basic 3D Modeling Simulations on Our Website.

  • Javascript
  • Jquery
  • ThreeJS
Source code →

Recent posts

  1. How to Prevent Overbooking in SQL with Multiple Methods

    In any application involving booking hotel rooms, flight seats, or similar resources, data integrity is crucial to ensure multiple users can’t “claim” the same slot concurrently.

    database
    5 min read

  2. Exploring module in NestJS

    Modules are crucial components at the center of NestJS. In this post, we will take a closer look at what modules are in NestJS.

    nestjstypescriptjavascriptdesign-patterns
    6 min read

  3. Problems when the application develops at medium and large levels

    From medium to large-scale applications, challenges like architecture maintenance and scalability hinder progress.

    applicationdesign-patterns
    2 min read

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