Managing lost and found items in institutional settings such as universities presents persistent operational challenges. This paper presents the Lost and Found Item System (LFIS), a cloud-based Single Page Application (SPA) developed using React.js v19, Firebase Authentication, Cloud Firestore, and the Cloudinary CDN. The platform enables authenticated users to submit image-linked lost and found reports, execute composite multi-parameter queries, and receive real-time listing updates through Firestore’s onSnapshot listeners. An administrative dashboard provides role-based moderation for institution staff. System Usability Scale (SUS) evaluation with 30 participants yielded a combined mean score of 81.4 (Grade B). Performance benchmarking on a 200-record dataset demonstrated first contentful paint averaging 1.74 s and composite Firestore queries averaging 1.08 s. Against the manual baseline, item logging time decreased by approximately 71% and record retrieval time by approximately 90%. The serverless architecture eliminates local infrastructure maintenance, and the design generalizes to equipment tracking, visitor management, and similar institutional resource management contexts.