Education
Taiwan University of Science and Technology（MS）Information management & Computer Vision Lab, Sep 2012 ~ July 2014
National Kaohsiung University of Applied Sciences（BS）Electronic Engineering, Sep 2008 ~ Jul 2012
Skill
Web Application:
Java/J2EE, Spring Boot, Spring5
SQL: MySQL, PostgreSQL, MongoDB
MessageQueue: RabbitMQ
Others: Docker, Jenkins, JUnit5, Spring Batch, Microservices, JMeter
TOEIC Listening & Reading Test ( Sept. 2019)
740 , Listening: 415 , Reading: 325
Experience
Rakuten Group, Inc, Senior Backend Developer July 2021 ~Present
Develop and maintain Item and shipment APIs (Item/Product/Inventory/Category/ImageResources/Shipping/FamilyMart/..) and handle DevOps for Rakuten Taiwan projects, collaborating with team members from Japan, China, and India.
FileManagement API object storage and DB migration
- Refactor and migrate the file management api from File storage and NAS to object storage.
- Develop the file migration tool with a thread pool to simultaneously migrate over 3 terabytes of files for all of
Rakuten TW's shops. - Initiate and conduct a discussion with the System Engineer and Backend leader to formulate a comprehensive plan for the database/files migration process, ensuring minimal downtime and zero data loss.
- Implement and plan the stress test with JMeter.
FamilyMart B2C project
- FamilyMartB2C as a new shipment option on the Rakuten e-commerce platform that empowers merchants to ship batches of products to distribution centers, ensuring faster delivery process for top merchants to ship their products.
- Design and implement a new Batch service for the new shipping method FamilyMart B2C in the Rakuten EC platform.
- Download files from FamilyMart's FTP server to update the shipping and order status on the Rakuten platform.
- Implement the deployment script for the Jenkins pipeline.
- Implement integration and unit tests to achieve a coverage rate of over 80% for quality assurance.
Resolve the database deadlock issue related to delete and re-insert operations
- Utilized SHOW ENGINE INNODB STATUS to analyze the database lock status for the READ COMMITTED transaction isolation level.
Shopping cart-revamp project
- Developed the new version Cart-API (Java and MySQL) to replace the legacy API (Ruby on Rails and NoSQL).
- Developed the Point handler business logic to calculate the Rakuten Super Point and shopper's Point Campaign.
Search Engine Feed project
- Develop the new version Search Engine Feed API (Java) to replace the legacy API (Ruby on Rails)
- Transform the data format from the relational database to search engine when the client updates shop/product/campaign information.
- Implement a full-shop feed to query all items within shops on the Rakuten platform in order to rebuild the search engine index.
- Implement a local cache for categories using a doubly tree data structure and read/write locks to retrieve tree paths instead of making repeated calls to the category API.
- Conduct a code review for colleagues and develop unit tests to achieve a test coverage rate of over 80% to ensure software quality.
- Developed data migration tool with spring-batch-partitioner
- Migrated 4 million records using multi-threading to reduce the processing time to approximately one-tenth of the original time (from 70 minutes to 7 minutes).
- Replaced the database from MongoDB with MySQL to speed up the API response time to reach 400 QPS.
InSynerger Technology Co., Ltd., Senior Backend Developer., July 2018 ~ March 2021
Designed and implemented the SHARP Thailand IoT platform
- System Analysis and Design for SHARP Thailand's IoT application.
- Designed and implemented work order dispatch system and web-based production line dashboard application.
Designed and implemented a more light way Rule Engine System to replace the legacy system and Drools APIs
- Designed and implemented a Rule Engine using the Interpreter Pattern with postfix expressions and the Easy Rules library.
- Resolved a hierarchical and/or logic expression using stack data structure.
- Example: [(deviceA’s power > 100) and (deviceB’s current > 10)] or (deviceC’s voltage > 10).
Developed and maintained the streetlight IoT platform for Kaohsiung and Taoyuan city with 40000+ IoT devices
Developed a new Backend API to replace the legacy system from MVC Frameworks to pure APIs
- Reduced the number of database queries by over 50% compared to the legacy system.
PChome & Skype, Linktel Inc., Backend Developer, Aug 2016 ~ Nov 2017
- Developed and maintained the Skype official site purchase system.
- Refactored ten microservices of the Skype official site purchase system from Struts2 to Spring Boot.
ARPlanet Digital Technology Co.,Ltd., Backend Developer, Oct 2015 ~ Aug 2016
- Developed an image retrieval API for a mobile Augmented Reality app.
