• Created a full-stack mobile application platform for artists to buy/sell music beats and rent music studio booths, successfully advancing to the final round of the Techstars (startup accelerator), and nearing a successful launch.• Architected a robust chunked upload solution that allows large files to be uploaded in parts and leverage AWS S3 to provide upload credentials and merge chunks upon completion, utilizing Redis to cache upload progress, significantly improving large file transfer reliability and user experience.• Crafted the mobile app UI in Flutter, using Riverpod for global state management and integrating with backend APIs to implement infinite scrolling and filtering on the beats listing page.• Established authentication with Spring Boot, including registration, login, JWT dual-token renewal, and OAuth2 for Google/Apple sign-in. • Harnessed Kafka to decouple the business logic for automatically sending emails upon user registration, increasing the system's throughput by 70% and ensuring reliable delivery of emails under heavy usage.• Orchestrated a CI pipeline using AWS CodeBuild, AWS CodePipeline, and AWS Elastic Beanstalk, enabling seamless and automated deployment of backend servers.

• Designed a property management mobile application, enabling tenants to message property managers, submit maintenance tickets, and pay rent. Successfully released on Google Play and the Apple App Store.• Engineered a backend APIs with Spring Boot to manage key features like maintenance ticket submission and messaging, leveraging AWS RDS MySQL for reliable database management, ensuring data integrity and consistency. • Built the profile and message pages with Flutter using GetX for statemanagement.• Devised a cloud-based monitoring system utilizing Firebase Cloud Messaging and AWS Lambda, automating real-time database surveillance and instant notification dispatch to tenant applications upon new message arrival, which optimized system responsiveness and improved communication efficiency by 30%.

Help students better understand computer networking

• Formulated a safety management system for chemical companies, allowing employees to take safety knowledge exams and enabling administrators to manage hazardous safety information.• Constructed a hazardous device management page using React that enables users to view and edit devices, using Redux's tag-based caching mechanism to reduce backend API calls, improving the page's smoothness.• Built backend functionality for managing hazardous equipment on the admin page, including CRUD operations, using JPA as the ORM and MySQL as the data storage.• Applied Spring Security, Spring Cloud API Gateway, and JWT to establish a robust authentication and authorization framework, enhancing system security for employees and administrators. • Designed database schema for employee exams using MySQL, creating secondary indexing to improve query performance for hazardous chemical knowledge tests.