$ whoami
Software Engineer · Full-stack & AI
I build the operational systems people run their workday on. I start from how the work actually happens, then turn it into software that holds up in production.
Bangkok, Thailand
Frontend
Next.js · React · Flutter
Backend
.NET · Node.js · NestJS
Database
SQL Server · MariaDB · PostgreSQL
In production
drivers on the delivery app I rebuilt
clicks to book a delivery slot, down from more than 10
downtime moving a WinForms system to Next.js
routing-matched skills guarding AI agents in the codebase
top Dice score in my published cardiac CT segmentation study
01 / About
I work at Beger on the systems behind the warehouse, dispatch and delivery operation: Next.js web apps, .NET APIs, Flutter apps on RF scanners and drivers' phones, and a lot of SQL Server.
Before that I built an AI visitor-gate system at Bangkok Medical Software, including its Thai ID card OCR, and did medical image segmentation research in Korea that won a best paper award.
I lean on AI coding agents such as Claude Code and Codex, and I put real effort into the skills, harnesses and checks around them so the speed doesn't cost quality.
02 / Experience
03 / Skills
04 / Research & education
Conference paper★ Best Paper Award, ICCT 2024
H. Lee, P. Puttimit, W. Thongsopa, S. Roh, Y. R. Lee, S. Y. Park, W. Y. Tak, S. K. Jung
Proceedings of the 7th International Conference on Culture Technology (ICCT 2024), pp. 86-92
+10.27 DSC points on myocardium (MYO), MM-WHS: 80.19 to 90.46
Journal article
W. Khamprapai, W. Thongsopa, C. Deejaiwong, J. Charoensuk, S. Mathulaprangsan, C. Chootong
Proceedings of Engineering and Technology Innovation, vol. 33, pp. 22-32, 2026
94.08% top DSC reported in the abstract
Education
Kasetsart University, Sriracha Campus
Jul 2021 to Mar 2025
Thai (native) · English (TOEIC 610)
05 / Contact
If you're hiring for a full-stack or AI engineering role, or have a project in mind, send a message and I'll reply by email.
Nov 2025 to present
Beger Co., Ltd.
Programmer
I build the operational systems behind warehouse, dispatch and delivery work, from the web apps and .NET APIs down to SQL Server.
Moved a WinForms desktop system to Next.js and a .NET REST API with no downtime, and the cutover is complete. The migration used dual writes at the SAP ingest point, a compatibility view across both data models, and paired deploy, rollback and verify scripts for every change.
Merged duplicated business logic into single-source-of-truth procedures and tuned the slowest queries using production Query Store data.
Rebuilt goods checking as a Flutter app for handheld RF scanners, replacing a ten-year-old web client. Scanning the item QR is now required before work can reach dispatch, with a controlled path for damaged labels, which used to leave customers unable to claim cashback.
Rebuilt the driver app in Flutter for more than 100 drivers. Drivers can attach proof-of-delivery photos later the same day instead of at the doorstep while carrying paint, reverse a job closed by mistake, and review past jobs. Vehicle access control is built in.
Added freight billing and return-document tracking to the dispatch web app, with per-piece and per-route rates and a view showing where each returned bill is. Before, finding one meant asking around or calling.
Integrated delivery slot booking with a major Thai home-improvement retailer. Every supplier truck needs a booked slot to enter a branch, which used to take 10+ clicks per PO in the retailer's vendor portal. It now takes 2, suppliers book their own slots, and it is in daily use after I took it from UAT to production.
Set up guardrails for AI agents working in this codebase: 23 routing-matched skills, a machine-checked routing matrix, and a pre-commit gate that fails the commit when routing regresses.
Apr 2025 to Nov 2025
Bangkok Medical Software Co., Ltd.
AI Engineer
Built an AI visitor and vehicle gate system that is live in condominiums, hospitals, hotels and government buildings. Each site has its own access rules, so multi-site configuration had to be clean.
Wrote the OCR backend for Thai ID cards. A guard scans a card and gets the result fast enough that the queue keeps moving. Integrated it with the Flutter apps and optimized the model to run on the device.
Built the admin dashboard that manages identity data, access rules and operations for every site.
Added voice input so guards can register visitors without typing, which matters when there is a line waiting.
Ran the production servers and the deployment pipeline.
Sep 2024 to Nov 2024
Kyungpook National University
AI Research Intern
Medical image segmentation research with U-Net and continual learning on the FLARE22 dataset. The work won the Best Paper Award at ICCT 2024.