As a backend Java Developer at ZaloPay, I used Spring Boot to build the platform and interacted with MySQL using Spring JPA. In addition to RESTful APIs, I also gained experience working with Kafka and gRPC to communicate between services in the context of the platform's microservice architecture.During my time at ZaloPay, I contributed to the Promotion Platform project, which aimed to provide promotions for ZaloPay's users. This project was just one of many that contributed to the overall success of ZaloPay, and working on it allowed me to collaborate with other teams, build new features, and address customer requirements using microservice architecture.

As a server backend Java Developer at OPSWAT, I was a part of the MetaAccess project, which offers a comprehensive cybersecurity solution for companies looking to control device access to their network based on pre-defined policies. The project was built using Angular on the front-end and Spring Boot on the back-end.Given the nature of the project, I gained invaluable knowledge in cyber security standards and circumspect implementation to ensure the highest product quality. Specifically, I contributed to MetaAccess Cloud, which used Spring Boot and MongoDB (via Spring Data MongoDB). To improve code quality, we applied OWASP Top 10 and Sonar. Additionally, I leveraged AWS Java SDK to interact with SQS and Amazon S3 in order to ensure a smooth experience for our users.

As a Java backend developer, I contributed to the Elevator Monitoring project, which aimed to provide a comprehensive solution for companies looking to monitor their elevators. The project used Angular on the front-end and Spring Boot on the back-end with microservice architecture.Working on this project was a unique opportunity for me to learn not only about technical knowledge but also about the amazing working cultures of team members from Singapore, Philippines, China, Vietnam, and Germany. Since I joined the project at its inception, I was involved in designing the project's database and architecture. My responsibilities included implementing features and investigating AI algorithms to enhance the project. For example, I used K-means to cluster data points (elevator stop positions), which helped determine the position for each floor.