JUN ZHENG YOONG

Senior Software Engineer / System Analyst

Senior Full-Stack Engineer

15+ years of experience building financial, payment, enterprise, web, mobile, and AI-powered applications.

Download Resume View Experience View Projects Contact

Taichung, Taiwan Remote Available junzheng87@hotmail.com

JUN ZHENG YOONG — Senior Software Engineer / System Analyst

About

Professional Summary

Senior Full-Stack Engineer and System Analyst with 15+ years of experience designing and building financial, payment, enterprise, web, mobile, and AI-powered applications. Strong track record in FinTech across card services, trust services, payment platforms, and banking API integrations, with expertise in system analysis, API architecture, database design, security, and production systems. Takes ownership from requirements through deployment.

15+Years of Software Experience

FinTechPayment & Financial Systems

Full-StackFrontend / Backend / Database

AILLM / RAG Applications

What I Can Do

FinTech & Payment Systems

Design and development of financial, payment, and card systems, including payment integration, financial workflows, API design, and banking API integration.

Card Transaction Fraud Alert System

Design and development of real-time card transaction fraud detection and alert systems, including rule-based and AI / machine-learning driven fraud risk monitoring.

One-Solution E-commerce Platform

Custom e-commerce platforms with RWD frontend, admin management system, multi-way authentication, permission control, and third-party payment integration.

Cross-Platform Mobile Apps

Custom cross-platform mobile applications (Flutter / Cordova) tailored to different business needs.

Web-Based Management Systems

Custom web-based management systems with permission control to fulfill different business needs.

Responsive Web Frontend

Responsive, accessible web frontends designed to meet different business and user requirements.

Expertise

Core Expertise

Technical capabilities organized by domain.

System Analysis & Architecture

Requirements Analysis
System Architecture
Technical Design
Database Design
API Architecture
System Integration

Financial Systems

FinTech
Payment Systems
Card Services
Trust Services
Foreign Exchange
Transaction Monitoring
Banking API Integration
Third-party API Integration

Backend

PHP
CodeIgniter
Laravel
Node.js
NestJS
REST API

Frontend

JavaScript
jQuery
Vue.js
React
Next.js
AngularJS
Bootstrap

Mobile

Flutter
Dart
Cordova

Database

MySQL
PostgreSQL
MSSQL
SQLite

Cloud & Infrastructure

GCP
AWS
Linux
Apache
Git
CI/CD

AI

LLM
RAG
Ollama
Embeddings
AI API Integration

Integration & Tools

WebSocket
WebRTC
RabbitMQ
LINE API
Postman
CronJob
IBM Security Scan

Experience

Professional Experience

2017 – Present

System Analyst

UNITRUST GLOBAL

Backend development and system engineering for financial and trust service platforms
Financial systems covering Exchange, General Instructions, Bill Payment, Trust Services, Card Services, and Card Transaction Monitoring
Banking and fintech API integrations with DBS, Zand Bank, ORO Bank, and Currencycloud
System analysis and architecture
API design and integration
Database design
Payment systems and card platforms (Mastercard / UnionPay cardholder platforms)
Security and transaction fraud risk control
Production system maintenance and quality control
Technical coordination

2015 – 2017

Senior Engineer

UNITRUST GLOBAL

Full-stack development (backend, frontend, database, API)
Forex trading and payment systems
Internal Mastercard management system
System security control and transaction fraud risk control
API Gateway
System integration and production deployment

2010 – 2015

Freelance Software Developer

Campus-Studio

Web applications (accounting, newspaper onboarding, comic book management)
Mobile applications (LBS advertising app)
API integration and API gateway
Client requirements analysis
Deployment and delivery

Education

2013 – 2015

National Chung Hsing University

Master's Degree in Management Information Systems

Thesis: A Study of Efficient Search in P2P Network

2010 – 2013

Feng Chia University

Bachelor of Science in Software Engineering

Information Security Certificate

Projects

Featured Projects

FinTech / Financial Platform

UTGL Financial Platform

Backend financial platform covering financial transaction processing, banking integrations, accounting, foreign exchange, payment instructions, card transactions, fraud detection, reconciliation and financial reporting.

Responsibilities

Financial transaction processing and backend engineering
Banking API integrations (DBS, Zand Bank, ORO Bank, Currencycloud)
Accounting, foreign exchange, and payment instructions
Card transaction fraud detection and AI-assisted risk monitoring
Reconciliation and financial reporting

Technology

Node.js · React · Microservices · Kubernetes · Docker · RabbitMQ · Redis · AWS · Machine Learning

FinTech / Payment

Mastercard Cardholder & Prepaid Card Platform

Cardholder management system, card top-up management system, and cross-platform cardholder mobile app and web platform for prepaid Mastercard cards, including credit card transaction simulation.

Responsibilities

System analysis and architecture
Backend, API, and database design
Payment integration and security

Technology

PHP · CodeIgniter · MySQL · REST API · Flutter · Cordova

FinTech / Payment

UnionPay Cardholder Platform

Cardholder management system and cross-platform mobile app for prepaid UnionPay cards, supporting cardholder self-service operations.

Responsibilities

System analysis and backend development
API and database design
Cross-platform mobile app development

Technology

PHP · CodeIgniter · MySQL · REST API · Flutter

FinTech

Trust & Investment System

Trust user management system with a client application for investment and trust operations.

Responsibilities

Full-stack development (Node.js, NestJS, React)
API design and PostgreSQL database

Technology

Node.js · NestJS · React · PostgreSQL

FinTech / FX

Financial & FX Payment Systems

247 Pay payment platform and FX Partner forex trading partner system, including internal management systems.

Responsibilities

Backend development and payment integration
Security and transaction fraud risk control
API integration and production deployment

Technology

PHP · CodeIgniter · MySQL · MSSQL

E-commerce / Payment

E-commerce & Payment Platforms

One-solution custom e-commerce platforms (Yong An, 1010, Magic Balloon) with RWD frontend, shopping cart, admin management, permission control, and third-party payment integration.