Senior Enterprise Service Engineer · CIMB Bank · Phnom Penh
Enterprise applications end to end: the interface, the backend, the database, and the deployment to production. Building for the web since 2016.
00 Why
A feature is one screen. A system is everything a request touches, from a person to production and back.
01 What I build
Angular and TypeScript for enterprise applications, with responsive layouts for a consistent experience across devices. Also React and Vue / Nuxt.
RESTful APIs for web and mobile channels and for integration with other applications; C# and .NET services that hold the business rules, the integrations and the scheduled work.
PostgreSQL schemas, queries and PL/pgSQL reporting; Docker containers behind nginx, released through Jenkins; monitoring, root-cause analysis and permanent fixes.
02 Selected work
Two internal banking platforms and two open-source libraries. The banking systems are confidential, so instead of screenshots each one is drawn as what it is: the people, the layers, and the numbers.
Branch staff collect property, vehicle and land tax through the web application we built. One shared .NET core serves the branch web app and the bank's mobile app (built by the bank's mobile team), and integrates with core banking and the government tax API.
≈ 100,000 transactions since go-live in late 2025, growing month on month.
A bank-wide complaint management platform. Any staff member raises a complaint, the owning department resolves it, the Call Centre verifies with the customer, and a central unit administers and reports.
12 weeks from mockup to production handover in 2026, with six roles in one workflow and three regulatory report types automated.
An open-source .NET library for "respond within 16 business hours": weekly hours with lunch breaks and night shifts, holidays and half days, any time zone with daylight saving handled, and a timer that pauses while you wait on the customer.
62 tests on .NET 8 and .NET 10, run on Linux, Windows and macOS, and a live demo that runs the library in your browser.
Try it in your browserAn open-source live trading chart that any website or web app can add with one HTML tag: smooth real-time candles, indicators, drawing tools, history that loads as you scroll back, positions and price alerts, full screen in portrait or landscape, and image export. It works in plain HTML, React, Vue, Angular, Svelte and Blazor, with complete documentation.
128 tests and no dependencies in about 38 KB, with a live demo on real market data and a settings playground that writes the code for you.
Open the live demoRead, write and check ISO 20022 payment messages, the format banks now use for transfers and statements: a .NET library that checks the official schema and the rules a bank checks (totals, balances, currency decimals, IBANs), and a browser viewer that explains any message in plain English without uploading it.
45 cases in a test suite any library can run, run against Java, Go and Rust libraries, with the bugs found in each published. The .NET library and the viewer give the same verdict on every case.
Open the viewerA feature is one screen. A system is everything a request touches on its way from a person to production and back. I work on every layer it passes through.
I enjoy solving problems where people spend a lot of time on careful, repetitive work that a well-designed system could do for them. The system should handle the complexity, so the user doesn't have to.
To make a system simpler for the people using it, I care about the database design, the deployment, and the operating procedures as much as the user interface. Earlier in my career I led a small development team, and I am still happy to be the person the team comes to when something needs figuring out.
03 More open source
Six open-source toolkits for everyday banking work. Each runs in the browser, so nothing typed or uploaded leaves the device, and each has its own tests and security review.
What does this loan really cost? Full payment schedules with exact decimal arithmetic, and the true yearly cost (APR) including fees.
Who does this payment QR really pay? Reads KHQR, PromptPay, DuitNow, QRIS, VietQR, PayNow and SGQR codes from a camera, a photo or text, and checks them against EMVCo's rules.
A double-entry ledger that refuses unbalanced or edited entries, enforced by PostgreSQL itself, and bank reconciliation against camt.053 statements that explains every difference.
Read, build and explain ISO 8583 card messages, the format behind most card payments and ATM withdrawals, with a simulated card host for testing terminals.
Screen a name against OFAC's sanctions list. Matching copes with typos, word order, accents and initials, and every possible match says why.
Anti-money-laundering rules over a file of transactions: structuring, money passing straight through, bursts, dormant accounts. Every alert explains itself with the numbers.
04 How I work
When someone asks for a new button, they usually want a faster, safer process. Before I build, I find out who does each step, what they wait for, where mistakes happen, and what "better" would mean for them.
The interface, the API, the services that hold the rules, the data, and the infrastructure it runs on: designed together, so every channel behaves the same way.
Monitoring, incident investigation, root-cause analysis, and permanent fixes. Documentation and operating procedures are part of the system, not something added later.
05 Stack
Angular · TypeScript · HTML & CSS · React · Vue / Nuxt
C# · ASP.NET Core · Node.js / Express · REST APIs · JWT
PostgreSQL · PL/pgSQL · SQL · MySQL · Redis
Docker · Jenkins CI/CD · nginx · Linux / Ubuntu · Kubernetes
Monitoring · Root-cause analysis · SIT / UAT · Release support
PHP · Java · Socket.io · real-time data · mentoring developers
Open to conversations
Open to conversations about enterprise and full stack engineering roles and projects.