February 2021 - Present

Software Developer Dotnet  全支付 PXPay Plus

• Building a financial system in microservice from zero
• Working in the Payment team, the core team in the electronic payment business
• Design and implement the Payment team microservice architecture
• Collaboration with the APP team and web team, write the suitable and flexible API
  specification.
• Mainly responsible for the business in the following system:
  • Order management system - Manage the order details and control the entire program flow in microservice; the tricky point is how to recover the data once one of the services is broken. 
  • Payment record system - Handle ten million to a hundred million counts of data, including report export quickly (one million row data) 
  • Marketing event system - Manage the event, including giving points or cash; the tricky point is to control the event quota amount limitation in high traffic and implement complex event rules 
  • POS trade system - Service provider for the collaborative system; the tricky point is letting the user app receive the trade result immediately (The trade initiator is the pos machine) 
  • Electric commercial trade system - Manage the orders from the electric platform; the tricky point is dealing with the complex platform redirection, including the website(on the phone or desktop) and native app 
  • Credit card trade system - Integrated with banks, dealing with authorized trade, 3D authorized trade, identity verification, and requesting money from multiple banks 
  • Bank account link trade system - Integrated with banks, strict encryption requirements, use HSM (Hardware security module) to secure keys, and implement different encryption algorithms 
  • Invoice system - Integrated with Trade-van Info Services, in the form of exchanging files 
  • Point system - Manage the point of members increase or decrease, which was designed with a flexible architecture 

• Introduced into new technologies
  • Introduced Centralized Configuration Management - Deal with in distributed system the cumbersome process of changing configuration 
  • Introduced gRpc protocol between each microservice and managed all Protocol Buffers files, including version control 
  • Introduced Event-Driven Architecture Event Bus pattern (implemented on Kafka), Outbox pattern, and Inbox pattern - For Eventual consistency 
  • Introduced GraphQL - For reducing frontend team called the count of backend API 
  • API gateway - Backend for frontend gateway(for app or web), Partner gateway (for third-party developers) 

March 2020 - February 2021

Dotnet Developer  街口支付

Responsible for the company's core business for payment, including creating orders, bonus rewards, Account Link, and Credit card.

Performance Optimization: Increased API performance by 1000% by using the profiler. (30ms -> 3ms)

Distributed tracking: Optimized debug in a distributed system by leading in CorrelationId and APM.

Summary: Face high concurrency, high rps, and distributed system.

February 2019 - February 2020

產品部負責人  康爾泰軟體公司

Responsible for refactoring major product that is the core business of the company. ( CSSD - Hospital system )

Manage a team of about ten people.

Architecture Analysis: The product usesMonolithicArchitecture because our clients are separated. So, for convenience deployment and publication, I chose that.

Business Analysis: Utilize DDD to analyze business requirements and understand what is the TRUE requirement for clients.

Project architecture: Uses Clean Architectureintegration with DDD, CQRS, and CRUD.

Summary: Training the best business analysis capability and what kind of problem domain be solved by what architecture.