NGUYỄN QUANG SANG

A backend system responsible for supporting high-volume betting transactions across multiple providers.

Project: Card Management System (CMS)

Description:
A card issuance and management system supporting credit and debit cards, integrated with payment gateways, acquiring banks, issuing banks, and card schemes.

Key flows:

• Off-us: Payment Gateway → Acquiring Bank → Card Scheme → Issuing Bank
• On-us: Payment Gateway → Acquiring Bank → Issuing Bank

Responsibilities:

• Designed and developed backend services for card issuance and card lifecycle management.
• Implemented and maintained on-us and off-us transaction flows.
• Worked with complex business rules related to card processing and banking workflows.
• Developed and optimized complex SQL queries for reporting, reconciliation, and validation.
• Collaborated closely with BA and QA to ensure business correctness and system stability.
• Deployed applications to DEV and UAT environments on Linux servers.

Technologies:
Java (Spring Boot 3.2, Struts v1, Servlet), Oracle Database, MySQL, Next.js

Project: Payment Gateway

Description:
A payment gateway system responsible for receiving payment transactions and forwarding them to merchant acquiring banks for processing.

Responsibilities:

• Developed backend APIs to handle payment transactions and merchant integrations.
• Implemented transaction processing logic with acquiring and issuing banks.
• Maintained and enhanced existing features while ensuring system performance and stability.
• Supported deployment and environment configuration on Linux servers.

Technologies:
Java (Spring Boot 3.2), MySQL, Next.js

Project: Insurance Management System (France)

• Developed backend services using Java Spring Boot for insurance workflows.
• Designed and optimized MySQL queries for business reports.
• Built frontend features using ReactJS.

Project: IoT Smart Home Platform (Singapore)

• Developed backend APIs for device management and monitoring.
• Built frontend interfaces using Next.js.
• Worked with PostgreSQL for device and user data management.

Technologies:
Java Spring Boot, ReactJS, Next.js, MySQL, PostgreSQL

Project: Financial Management System (Mobifone – Southern Region, Vietnam)

Description:
A financial management system supporting accounting and financial operations for Mobifone’s southern region.

Responsibilities:

• Maintained and enhanced backend services using Java Spring Boot.
• Analyzed and fixed backend issues related to financial business logic.
• Worked with Oracle Database to handle financial data and improve query correctness.
• Collaborated with team members to investigate issues and ensure system stability.

Technologies:
Java Spring Boot, Oracle Database, Hibernate, Git, Maven
Frontend: Angular

• - The bank's visa and Mastercard management products
• - Frontend: JSF
• - Backend: Java EJB, Database: Oracle
• BPC (Banking-Payment-Company) provides an integrated digital ecosystem comprising banks, processors & merchants to deliver relevant customer services. Central banks, commercial (neo)banks, issuers, acquirers, PSPs, transport operators, and governments rely on our SmartVista Platform to connect the dots and turn payments and data assets into full end-to-end transactions. We ensure people pay, get paid, lend, loan, plan, buy, transit, travel, claim a pension.
• Main responsibilities:
• - Fix bug backend- SQL
• Achievements and skills gained:
• - Use JSF, Java/EJB, Oracle Database, WebLogic, GIT, Maven.
• - Improve Java code skills.- Research and seek, solve problems skills