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Portrait of Gun Kimsong

Gun Kimsong

Full-Stack Developer10+ yearsBangkok, Thailand

01 · Profile

About Me


I’m a full-stack developer with 10+ years of designing and integrating systems for banking, insurance, healthcare and retail. I’ve built an insurance super-app for AIA Thailand and merchant apps for Krungsri, and reverse-engineered the legacy POS at Tesco Lotus to build a new POS server, deployed to ~2,600 stores. Since 2025 I’ve also led AI adoption programs for 8 banks and enterprises, including Bangkok Bank, Krungthai, GSB and IBMDT, and trained 850+ engineers in AI-assisted development. Before all this, I founded an event-organizer business and built its booking platform end to end.

02 · Career

Professional Experience


Palo ITSenior Full-Stack Developer

February 2022 - Present

AIA Thailand – AIA OneSenior Full-Stack Developer

2022 - 2023

  • Contributed to the architecture and implementation of AIA One, an all-in-one insurance super-app for agents, built on Java microservices and a modular React Native frontend.
  • Defined service boundaries and integration patterns between the mobile modules and backend services so feature teams could release independently, and aligned practices with the client’s developers.
  • Java
  • Microservices
  • React Native
  • TypeScript

BAY (Krungsri Bank) - Biz-MungMee, MungMee-ShopSenior Full-Stack Developer

2023 - 2025

  • Designed the core Flutter application architecture shared by Biz-MungMee and MungMee-Shop, Krungsri’s apps for shop owners and merchants.
  • Guided integration and platform decisions with the bank’s developers to improve merchant onboarding and transaction reliability.
  • Flutter
  • Dart
  • REST integration

Bangkok Bank, KWSP, AXONS, Nimble, GSB Bank, Krungthai Bank, IBMDT, BAYFacilitator & Lead, AI Adoption Program

2025 - Present

  • Led large-scale AI adoption and technical upskilling programs across these 8 banks and enterprises, designing and delivering hands-on GitHub Copilot workshops for up to ~200 participants per session.
  • Trained 850+ engineers on AI-assisted development, prompt engineering, and AI-driven workflow transformation; followed up with mentoring, technical standards, and client architecture reviews for long-term maintainability.
  • Demonstrated agentic modernization workflows to senior technology leaders at the Microsoft, PALO IT and GitHub executive roundtable (2026).
  • GitHub Copilot
  • Prompt engineering
  • AI-assisted development

KWSP is Malaysia’s Employees Provident Fund; GSB is Thailand’s Government Savings Bank; BAY is Bank of Ayudhya (Krungsri).

Tesco LotusFull-Stack Developer

February 2021 - February 2022

  • Reverse-engineered the legacy POS protocol during the handover from Tesco to CP Group, then designed and built the new POS server and rolled it out to ~2,600 stores nationwide.
  • Integrated in-store systems with eCommerce and loyalty platforms (Magento, SessionM), with data synchronization, reconciliation, and recovery that kept orders, stock and member data consistent when a store went offline.
  • Contributed to the architecture and frontend development of the new Lotus online platform.
  • Built internal analytics and forecasting platform for sales and workforce planning across all stores.
  • Reverse engineering
  • POS server
  • Magento
  • SessionM
  • React

Think AlgoFull-Stack Developer

June 2017 - February 2021

  • Designed and built CRM architecture for healthcare insurance claim management system, including workflow orchestration, document handling, and audit trail.
  • Designed and developed financial and retirement planning platform (“Imsooks”).
  • Worked on trading system monitoring platform (C#) focusing on reliability and operational stability.

The Wealth SpaceFull-Stack Developer

November 2016 - June 2017

  • Designed and built online ticketing platform and automation tools based on business workflows.
  • Collaborated directly with business users to redesign processes and system flows.

Own Company (Event Organizer)Founder & Full-Stack Developer

2013 - 2016

  • Founded and ran an event-organizer business; built and operated its online booking platform end to end.

03 · Skills

Technical Stack


Architecture & Platform

  • REST API Design

Languages & Frameworks

  • Next.js

Data & Infrastructure

  • MySQL
  • AWS
  • Jenkins

Testing & Automation

  • Playwright
  • Puppeteer
  • Patrol
  • Flutter integration_test

04 · Education

Degree


  • Mahanakorn University of Technology

    2011 - 2013

    Bachelor of Information Communications Engineering (ICE), continuing program after a Higher Vocational Certificate

05 · Credentials

Licenses & Certifications


06 · Built solo, requirements to production

Products I’ve Built


  • Designed and built a serverless event-booking and ticketing platform on GCP (Cloud Run, Nuxt.js, Firestore).
  • Integrated a payment gateway; it runs no servers between events and absorbs ticket-sale spikes.

A seminar and event booking platform integrated with a payment gateway. The whole stack is serverless on GCP, so it scales to zero between events and handles ticket-sale spikes without any servers to manage. I built it from scratch, frontend to backend, as a deliberate move from PHP to a modern cloud-native stack. Courses such as Wealth Dynamics are sold through it at event.pay4tomorrow.com.

Stack

  • Nuxt.js
  • Vuex
  • Google Cloud Run
  • Firestore
  • Firebase
  • Payment gateway
event.pay4tomorrow.com listing Wealth Dynamics courses

  • Built a Lazada-style fresh-fruit marketplace with Django, Nuxt.js, PostgreSQL and Docker on DigitalOcean.

A marketplace-style e-commerce site focused on fresh fruit, with a Django API and a Nuxt.js storefront, running in Docker on DigitalOcean.

Stack

  • Django
  • Python
  • Nuxt.js
  • PostgreSQL
  • Docker
  • DigitalOcean

  • Built a multi-language five-star hotel website on heavily customised WordPress with a bespoke design.

A five-star hotel website with multi-language support, built with heavily customised WordPress themes and components.

Stack

  • WordPress
  • Elementor
  • PHP
Royal Cliff hotel website

  • Built a Google Cloud Functions service that reads Thai ID cards with Cloud Vision OCR and verifies them with DOPA.

Upload an ID card image → Cloud Vision OCR extracts the fields → the service checks them against the Department of Provincial Administration (DOPA) service and returns whether the card data is valid.

Stack

  • Google Cloud Functions
  • Cloud Vision
  • DOPA integration

  • Built a Thai, English and Chinese website for a fertility clinic on WordPress, with treatments, packages and a blog.

Fertility clinic website with multi-language support.

Stack

  • WordPress
  • Elementor
  • PHP
ibabyfertility.com homepage

  • Built the brand website for a Thai silk fashion label on WordPress, with lookbook, gallery and press pages.

Thai silk fashion brand website with multi-language support.

Stack

  • WordPress
  • Elementor
  • PHP
passasilkwear.com homepage

  • Built the Klean&Kare saline product website, with a product catalogue, where-to-buy pages and health articles.

Product website for the Klean & Kare range of saline-based products.

Stack

  • WordPress
  • Elementor
  • PHP
kleanandkare.co.th homepage

  • Built the website for a Bangkok aromatherapy brand, presenting its essential oils, diffusers and fragrances.

Scent-based lifestyle product website.

Stack

  • WordPress
  • Elementor
  • PHP
cholaromatique.com homepage

07 · Events

Talks & Workshops


  • Around 70 Krungsri engineers coding along during the Build Your Own MCP Server session

    17 Jun 2026 · Speaker

    GitHub Adoption Training — Krungsri (BAY)

    BAY Head Office, Bangkok · Bank of Ayudhya (Krungsri)

    Spoke to around 70 Krungsri engineers on adopting GitHub AI tooling, including a hands-on "Build Your Own MCP Server" session: what an MCP server really does, how MCP hosts, clients and servers fit together, and building a server that exposes tools to AI assistants, with everyone coding along on their own laptop.

  • Gun Kimsong presenting the agentic modernization demoSpeakers and guests at the Microsoft × PALO IT × GitHub roundtable in Bangkok

    Jun 2026 · Speaker & live demo

    Agentic AI — From Interest to Enterprise Modernization

    Bangkok · Microsoft × PALO IT × GitHub Executive Roundtable

    Private roundtable for senior technology leaders on moving from AI interest to real enterprise action, alongside Microsoft Thailand, GitHub and PALO IT leadership. With Vachara, I demonstrated how agentic workflows support legacy replatforming and continuous modernization, moving teams from manual, reactive modernization to a proactive approach where systems respond to new signals and requirements with better traceability.

  • Gun Kimsong presenting at the Krungthai Bank GitHub Copilot Kick-offAround 200 Krungthai Bank participants in the training hall

    17 Dec 2025 · Trainer

    GitHub Copilot Kick-off — Adoption training for Krungthai Bank

    Ambassador Hotel, Bangkok · Krungthai Bank (KTB), cohort 1/2025

    Delivered GitHub Copilot adoption training with PALO IT to around 200 executives and technology staff at Krungthai Bank: building the right mindset and giving practical guidance for adopting Copilot in real-world scenarios, so teams can use AI to improve productivity at team and organisation level.

  • Gun Kimsong speaking at Season of AI BangkokAudience watching the live demo on stage

    20 Apr 2025 · Speaker

    Season of AI — Build applications with GitHub Copilot Agent Mode

    Bangkok · Global AI Bangkok, supported by Microsoft

    Showed how developers can now work side by side with AI to write code, run tasks and fix bugs using natural language, with live demos of GitHub Copilot Agent Mode for the Global AI Community in Bangkok.