Group 1 - The backend project is built on a microservices architecture using SpringCloud and SpringBoot, with the frontend on a WeChat mini-program mall [1] - Key components include service gateway Zuul, service registration and discovery using Eureka and Ribbon, and service fault tolerance with Hystrix [1] - The architecture supports distributed locking with Redis, service calls via Feign, and message queuing with Kafka [1] Group 2 - The characteristics of the flash sale scenario include a significant surge in website traffic as many users attempt to purchase simultaneously, with the request volume far exceeding available inventory [1] - The design philosophy for the flash sale architecture emphasizes traffic limiting, peak shaving, asynchronous processing, and memory caching to enhance system performance [1] - Scalability is crucial for supporting more users and higher concurrency, allowing for elastic expansion of the system as traffic increases [1]

Core Points - The article discusses the architecture and technology choices for social applications, emphasizing the importance of selecting the right frameworks and services for development [5][8][9]. Group 1: Frontend Development - The frontend of a social app consists of mobile (iOS/Android) and web applications, utilizing frameworks like React.js, Vue.js, and Angular for single-page applications [3][5]. - Mobile app development can be native (using Swift for iOS and Kotlin for Android) or cross-platform (using React Native, Flutter, uni-app, or Taro), each with its own advantages and disadvantages [6][8]. Group 2: Backend Development - The backend handles business logic, data storage, user authentication, and API interfaces, with popular frameworks including Spring Boot for Java, Django for Python, and Express.js for Node.js [9]. - Java is noted for its high performance and stability, making it suitable for large-scale applications, while Python offers rapid development capabilities for smaller projects [9]. Group 3: Database and Storage Solutions - Relational databases like MySQL and PostgreSQL are commonly used for structured data, while NoSQL databases like MongoDB and Redis are preferred for unstructured data and high-speed access [9]. - Object storage services from providers like Alibaba Cloud and Tencent Cloud are essential for managing user-generated content such as images and videos [9]. Group 4: Cloud Services and Compliance - For the Chinese market, compliance with local regulations, including ICP filing and app registration, is crucial, along with the selection of domestic cloud service providers like Alibaba Cloud and Tencent Cloud [8]. - The article highlights the importance of integrating third-party SDKs for functionalities like instant messaging and content moderation, with a focus on local providers [8][9]. Group 5: Development Tools and Technologies - The use of message queues (e.g., Kafka, RabbitMQ) and search engines (e.g., Elasticsearch) is recommended for system decoupling and enhancing user experience through personalized content [9]. - Containerization technologies like Docker and Kubernetes are suggested for efficient application deployment and management [9].