As the sole backend developer for www.onestep.place, I leverage Go, Gin, GORM, MySQL, and Redis to design maintainable and efficient backend systems. My work focuses on clean architecture, reliable data handling, and seamless integration with external services. Key Responsibilities and Achievements • Managed backend development, including architecture design, feature implementation, and system maintenance. • Implemented Redis indexing and MySQL full-text search, enabling precise keyword searches and efficient filtering with pagination. • Refactored two major projects following Clean Architecture principles, enhancing modularity and maintainability. • Integrated payment systems and implemented a robust refund mechanism for secure transactions. • Designed a Google Calendar synchronization system using Redis queues and long polling for reliable data exports. • Built a hierarchical tagging system to enable intuitive categorization. • Conducted unit testing with testing, mockery, and go-sqlmock to ensure high code quality. • Enhanced development efficiency by utilizing GitHub Copilot.

TapPay is a leading Payment Gateway solution offering multiple payment options and a seamless user experience. In 2021, the platform processed transactions exceeding 50 billion NTD, solidifying its position as a reliable choice for businesses. Key Responsibilities and Achievements • Developed and maintained Payment Gateway services using Spring Boot to support diverse payment methods and ensure smooth transaction processing. • Improved code quality by writing comprehensive test cases with JUnit, Mockito, and PowerMock, reducing production issues and enhancing maintainability. • Conducted peer code reviews to ensure adherence to high software quality standards across the team. • Troubleshot and resolved customer-reported issues, ensuring minimal service disruption and improved satisfaction. • Collaborated with cross-functional teams to deliver robust payment solutions aligned with business requirements.

• Developed custom CMS features using KeystoneJS 5, Draft.js, Node.js, React.js, PostgreSQL, and GraphQL, improving content management efficiency. • Refactored Python data feeds and integrated Elasticsearch clusters to enhance media website search performance. • Maintained and extended backend services using Go and Gin. • Automated data processing with Python schedulers, streamlining workflows. • Managed CI/CD pipelines with GitOps, Kubernetes, Helm, Flux CD, Drone CI, and Docker, ensuring seamless deployments. • Configured GCP infrastructure and Nginx to optimize resource utilization and application stability.

Cathay United Bank (5 months) • Developed and maintained APIs using Spring Boot. BEANGO CO., LTD. (1 month) • Developed a RESTful API for inter-service communication using Java, Play Framework, Apache Kafka, and Hazelcast.

• Developed web-based B2B SaaS applications, including Online Fitness Course Booking, POS Management, and Payment Gateway Reporting/Dashboard systems. • Maintained a Central Authentication Service (CAS) using OAuth2.0 for secure user authentication. • Applied Clean Architecture principles to deliver maintainable and testable modules. • Designed and optimized relational database schemas in compliance with Third Normal Form (3NF). • Enhanced API performance through Java concurrency, SQL tuning, and code refactoring. Technologies: Java 8, Play Framework, EC2, RDS, Memcached, S3, IntelliJ IDEA, Git, MySQL, MongoDB, Swagger, Docker, JUnit, EBean, JPA

Data Management Platform | Backend Engineer • Developed RESTful serverless APIs for a real-time statistics dashboard using Node.js, Serverless Framework, AWS Lambda, AWS API Gateway, AWS RDS, and MySQL. • Optimized API performance through SQL tuning and Async module implementation, reducing average response time by 40%. • Designed an early workflow for clickstream data collection using GTM, JavaScript, and PHP, improving data accuracy. Additional Projects • Published a shopping-cart application built with Swift and Storyboard. • Enhanced a slot machine game using Cocos2d, improving functionality and user experience. • Created tracking SDKs in Objective-C and Swift, ensuring seamless integration with advertising platforms. • Built web services with PHP, Laravel, and MongoDB.

• Developed native iOS applications for iOS 7 using Objective-C and Storyboard, ensuring optimal performance and user experience. • Integrated a C-based filesystem and UDP/IP networking for efficient and reliable remote file access (RFA). • Enhanced third-party C-based filesystem functionalities to improve stability and performance. • Designed and implemented RESTful APIs with Java Servlet to support application features. • Published two iOS apps: WiFi@SDCF and WIFI-ShareDisk.