Zhixian Teo developed session-based upload tracking for the LifeSG/web-frontend-engine repository, focusing on the ImageUpload and FileUpload components. By introducing a sessionId prop, Zhixian enabled session-scoped validation and tracking, which ties uploads to specific user sessions and improves reliability in multi-upload scenarios. The implementation involved updating TypeScript type definitions to support sessionId as a string or undefined, ensuring backward compatibility, and modifying upload payloads to consistently include sessionId for accurate processing and auditing. Working primarily with React and TypeScript, Zhixian’s work enhanced data integrity, traceability, and user experience in bulk upload flows, demonstrating thoughtful component development.