Phnom Penh, Cambodia

hey, i’m Sihathun

Full-stack developer & Software Engineering student. Backend-leaning, full-stack by need — I build and ship real products for teams across Cambodia and Japan.

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Resume
Portrait of Sihathun Sin

  1. Kirirom Institute of Technology (キリロム工科大学)

    Internship · 1 yr 3 mos

    Phnom Penh, Cambodia · On-site

    Back End Developer

    Jun 2026 – Oct 2026 · 5 mos
    • Designed and built backend systems for AI-powered products.
    • Built a multi-tenant agent platform with strict data isolation between tenants.
    • Built a job-matching service that aggregates listings from multiple job boards.

    Back End Developer

    Jan 2026 – May 2026 · 5 mos
    • Back end developer of a parcel delivery app.
    • Mainly worked on the destination route optimization feature (OSRM) and development of the main application features.

    Full Stack Developer

    Aug 2025 – Dec 2025 · 5 mos
    • Developed an e-commerce platform project for the school as an internship, working as the Full Stack Developer.

  2. Wald DX

    Internship · 6 mos

    Hiraizumi, Iwate, Japan · On-site

    Full Stack Engineer

    May 2026 – Oct 2026 · 6 mos
    • Built a customer and curtain cutting management system for the company staff, now maintained by a 4-person team.
    • Backend (Next.js): auth, store, and commerce features, database schema, and API documentation.
    • Frontend: landing page and subdomain storefront pages wired to the API.

    Full Stack Engineer

    May 2026 – Oct 2026 · 6 mos
    • Building 2 client projects (NDA) in a 3-person team: Express.js backend (APIs, database, system design) and Next.js frontend.
    • Managing all of the projects' infrastructure and services, as well as the business's payment systems.

    Infrastructure Manager

    May 2026 – Oct 2026 · 6 mos
    • Managed all of the Wald DX projects' infrastructure and services, mainly on AWS, and the payment services for each project.

Featured projects

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JobFit poster

JobFit

SHIPPED

Job-matching platform for Cambodian job seekers — aggregates listings from CamHR, JobNet, BongThom & Jobify through a two-phase crawl-then-search pipeline.

TypeScriptExpress.jsWeb Scraping
PhnomPath Logistics poster

PhnomPath Logistics

SHIPPED

Same-day delivery app connecting online and in-store sellers to customers within hours, with route optimization for delivery planning.

Express.jsTypeScriptRoute Optimization
KjeyPleng poster

KjeyPleng

SHIPPED

Music instrument marketplace — lets users lend, rent, buy, and sell instruments. Solo full-stack build.

Express.jsTypeScriptReact (Vite)
Source

Current tech stack

TypeScript

Primary language

Python

Language

Next.js

React framework

React

UI library

Node.js

Runtime

Express.js

Backend framework

FastAPI

Python web framework

PostgreSQL

Database

Drizzle ORM

TypeScript ORM

MongoDB

NoSQL database

Tailwind CSS

Styling

Docker

Containers

Git

Version control

Redis

Cache / queues

LangChain

LLM framework

AWS

Cloud platform

Vercel

Deployment

DaVinci Resolve

Video editing