Our team focused on designing a GraphQL Gateway Service to integrate multiple backend REST APIs, enabling suppliers to perform complex product queries through a single, efficient endpoint.

I was a Java developer of the Post-Purchase Platform group, I was responsible for developing backend services for Order Tracking and Status History to support TikTok Shop. We developed scalable, write-optimized systems using Cassandra to manage real-time order state transitions and support high write throughput and horizontal scalability, ensuring data consistency and system availability under heavy load.

I worked as a backend developer at TravelSky, designed and built the Ticket Booking Service, which lets third-party agents book flights and check flight and ticket details. I used Spring Data JPA and Hibernate to handle database operations with MySQL and Oracle. I also helped create an internal tool to browse API documentation and used Amazon IAM to manage user roles and groups.

I focused on building and optimizing the order management system, including core features such as order creation, payment processing, and inventory synchronization.