WorkSpartan
Deep Sky Climate
IoT data platform for a carbon removal project developer. Founding engineer: Go ingestion from AWS Kinesis, Spark batch jobs on EMR and the Airflow pipelines that run them.
- Go
- Scala
- Apache Spark
- Airflow
- Kubernetes
Hello, folks! 
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.
- I live in Ho Chi Minh, Viet Nam.
- I was born in the beautiful Quang Ngai city.
- My first programming language I learned was C++.
- I love web development.
- I'm focusing on building LoanBud, a business financing platform.
- I work mostly with Javascript/Typescript technologies.
- I'm a dog-person
. - I'm a sporty-guy. I love
, 
. - I love listening
and rap music. - I love playing video game
, LoL is my favorite one.
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
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WorkSpartan
Dealops
Agentic CPQ for complex pricing. Built the in-app AI chat assistant, admin pricing tools (catalog, tiered pricing, approval rules) and quoting features.
- React
- TypeScript
- tRPC
- Prisma
- Turborepo
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
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
Side3D on the web
Simulate Basic Geometry
Explore the World of Basic 3D Modeling Simulations on Our Website.
- Javascript
- Jquery
- ThreeJS
Recent posts
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.
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.
Problems when the application develops at medium and large levels
From medium to large-scale applications, challenges like architecture maintenance and scalability hinder progress.
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