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Actively participated in designing the architecture for a new dating app, gaining valuable experience in building complex systems from the ground up. This involvement provided me with a deeper understanding of system scalability, performance optimization, and design best practices. Implemented a secure authentication and registration module using JWT, ensuring user data protection and streamlining the onboarding process. Developed a real-time notification microservice using WebSocket (Socket.io) and NATS, improving user engagement with instant messaging capabilities. Integrated caching mechanisms to optimize query performance, leading to a 90% reduction in response times for cache hits. This significantly enhanced the app’s overall performance and user experience. Led the development of the Core module for managing user profiles and balances, enabling seamless in-app transactions. This implementation received high praise from stakeholders for its reliability and efficiency. Built and integrated a photo upload feature, compressing images and storing them on S3 for optimized storage and retrieval. This feature enhanced user interaction and profile personalization within the app. Optimized complex database queries, reducing query response times by 30%, which greatly improved app performance, especially under high traffic loads.