About Me

Welcome to my blog! This is my personal space where I share my thoughts, insights, and experiences in payment technology, system architecture, and software development.

Personal Profile

I'm Zhang Qingdong, a Senior Java Engineer and Team Leader with 9 years of experience in payment system development, specializing in cross-border payment solutions. As a "Bridge Builder between Technology and Business," I combine deep fintech expertise with excellent engineering practices to create secure and reliable cross-border payment infrastructure.

Technical Skills

  • Programming Languages: Java (core), SQL, JavaScript, Python
  • Frameworks/Libraries: Spring Boot, Spring Cloud, MyBatis, Hibernate, React
  • Databases: MySQL, Oracle, Redis, MongoDB, ElasticSearch
  • Middleware: Kafka, RabbitMQ, Nginx, Zuul, Gateway
  • Tools/Platforms: Docker, Kubernetes, Jenkins, Git, Maven, Jira
  • Architecture/Methodologies: Microservice Architecture, Distributed Systems, DDD Design, Agile Development, CI/CD
  • Payment Domain: Payment Gateway, Clearing & Settlement Systems, Smart Routing, Risk Control Systems, Cross-border Payments, Multi-currency Payments

Work Experience

Wuhan Ronghan Technology Co., Ltd. | Team Leader | Nov 2019-Present

Led the technical planning and architectural design for the company's cross-border payment product line, ensuring high availability and scalability. Designed and implemented a microservice architecture cross-border acquiring system based on Spring Cloud, using DDD design methods to define clear domain boundaries. The system supports 15 currencies and 8 international card schemes, processing over 100,000 transactions daily. Built an intelligent routing decision engine based on rule engines and machine learning, reducing overall transaction costs by 18%, with 99.95% system availability during peak periods.

Shanghai Kaixer Software Co., Ltd. | Senior Java Developer | Feb 2018-Nov 2019

Participated in the design and development of core modules for financial payment systems, including transaction processing, risk control, and account management. Led the implementation of microservice architecture for card issuance business system reconstruction, reducing card application processing time by 40% and improving system throughput by 65%. Designed and implemented a token authorization system based on OAuth2.0 and JWT for mobile payment scenarios.

Beijing Csii Software Systems Co., Ltd. | Java Developer | Jul 2016-Feb 2018

Involved in the development of SPD Bank's rural B2C express payment system, new merchant express payment signing system, B2C fee settlement system, and unified cashier system. Reconstructed core payment and cancellation functional modules, achieving seamless integration between rural banks and headquarters systems, handling request peaks of 200 TPS, improving transaction success rate by 15% and reducing system response time by 30%.

Project Experience

I've led several significant projects, including:

  • Onerway Cross-border Acquiring: Built cross-border payment acquiring solutions for global e-commerce and SaaS service providers, supporting multi-currency, multi-channel, and multi-scenario payment processing
  • Onerway Cross-border Collection: Provided overseas collection solutions for cross-border e-commerce sellers registered in mainland China/Hong Kong
  • UnionPay International Virtual Card Project: Designed and implemented globally applicable virtual credit card standards and card issuance system for UnionPay International
  • Unified Cashier: Integrated and reconstructed SPD Bank's online payment system, unifying multi-channel payment entry points

Education

Anhui University | Bachelor's Degree | Network Engineering | 2012-2016

  • Major courses: Computer Networks, Data Structures and Algorithms, Operating Systems, Database Systems, Java Programming, Software Engineering
  • Received Outstanding Student Award and Outstanding Graduate honors
  • Selected for the Network Engineering Excellence Program, receiving small-class teaching and enterprise training

Contact Information

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