Hang Yuan Email & Phone Number

Sunnyvale, California, US

Bentonville, Arkansas, US

• e-commerce, walmart.com, List&Registry team
• Data Consolidation: Collaborated across teams to migrate list & registry data from multiple regions across North America to one unified dataset. Designed and executed a data migration and cutover strategy for LAAS.
• LAAS (List as a Service): Using Spring Boot and Java 17, developed LAAS service to replace the legacy region-owned services and integrate all customer-level List & Registry services across North America for Walmart and.
• Followed Event Driven architecture to integrate purchase order and barcode customer experience enhancement with Kafka.
• Introduced a new set of Restful API to support Wishlist feature for customers to keep track of their lifetime important events.
• Designed and developed APIs and business flow to manage customer privacy complying with the “My Health, My Data” Act.

• Researched eSIM technology supervised by Professor Henning Schulzrinne and senior researcher Artiom Baloian.
• Understood eSIM implementation on customer devices and designed the specialized one for IoT devices.
• Published report titled 'eSIM Technology in IoT Architecture' on arXiv (arXiv:2401.04302v1 [CS.NI]).

Bentonville, Arkansas, US

• MyClub team @ Sam’s Club Technology
• Microservice Architecture: Constructed backend service integrated into microservices to support different level of club leaders to monitor and manage club daily operations, integrated sales service, inventory service.
• Performance Enhancement: Utilized Java 8 and 11 new features, including concurrency APIs and multithreading, to enhance computing performance, achieving a 35% increase in computing efficiency and data processing speed.
• Persistence Layer Optimization: Implemented Spring Data JPA to persist data in Azure MySQL Database with Hibernate. Optimized code logic and database indexing, reducing overall persisting time by 95%.
• Cloud Deployment: Deployed applications using Azure Cloud, Walmart OneOps, and WCNP with Blue/Green Deployments.
• Quality Assurance: Integrated SonarQube, Hygieia, Spring Testing, JUnit, and Mockito, achieving 95% code coverage and identifying 15% potential bugs leading production incidents.

Santa Cruz, California, US

• Led 10+ engineers as a technical leader and mentored multiple student interns and engineers.
• Motivated team and coordinate roadmap for multiple project releases with buy-in and checkpoints leaders in operations, technology, and program.
• Designed architecture of microservices and be responsible to remove technical blockers.
• Coordinated engineering teams to delivery product and performed quality checks in multiple dimensions.
• Managed entire development/product delivery cycle in Agile/Scrum approach.

• Developed payment system for an online shopping service with Spring Boot and Spring Cloud frameworks.
• Integrated Kafka asynchronous messaging system to save overall processing time and enable failover mechanism.
• Utilized cloud services to deploy and monitor backend services.
• Designed unit testing with Spring Boot Testing Framework, Junit and Mockito/PowerMockito tools.

• Implemented new features and enhancements and debugged UI display issues for a resource management software.
• Improved a resource management software based on C++,.NET Framework 4.0, Java and JavaFX.
• Developed new features (document manipulation and calendar remainder) with Java 8 currency APIs.
• Debugged UI display issues and made enhancement to component loading process.

Master Of Science - Ms, Computer Science

Bachelor Of Science - Bs, Computer Science (With Honors)

Minor, Technology Information Management