Please explain the technical structure of your product to me.

This question seeks a comprehensive description of the technology, structure, and organization underlying your product. The interviewer aims to evaluate your grasp of the entire system/software/product you have been involved with. They are keen to understand how the different components of your product function, communicate, and interact with one another. Here are the main points to cover: Overview of the system architecture: Be sure to specify the type of architecture your product employs, such as monolithic, microservices, or serverless architecture, among others. Summary of the technology stack: Outline the technologies used in the development of the product, including programming languages, databases, and development frameworks. Explaining the rationale behind choosing these technologies could enhance your response. Information flow: Explain how data or requests are transferred between the various components within the system. If your architecture includes APIs, queues, or event-driven programming, mentioning these would be beneficial. Infrastructure details: You may want to address aspects related to deployment, load balancing, and scaling. Database architecture: How is the data stored? What database design principles have been implemented?

Our product is built on a Microservices Architecture, where the system is segmented into smaller services that operate in their own processes and communicate through lightweight methods, typically utilizing HTTP/REST APIs that return JSON. The technology stack comprises Java and Spring Boot for backend services, while Angular is utilized for the frontend. We employ a mix of MySQL and MongoDB databases for different services based on their specific use cases. Each service is equipped with its own database to ensure decoupling from other services, thus preventing schema updates or changes from affecting other components. Services interact through APIs using JSON payloads. For asynchronous communication between services and to manage peak load traffic, we use RabbitMQ. We implement Docker for containerization, allocating a separate container for each service. This allows containers to be deployed anywhere, greatly enhancing application deployability. We utilize Kubernetes to manage these containers, which also addresses our auto-scaling requirements.

The technical architecture of our product emphasizes a layered approach and the separation of concerns. We utilize a three-tier architecture consisting of presentation, logic, and data layers. The front-end, serving as the presentation layer, is developed using ReactJS. It retrieves data from an API and presents it to the user, offering controls for data manipulation. Our business logic layer is implemented in .NET, where it processes commands, makes logical determinations and evaluations, and performs computations. Additionally, it acts as an intermediary for communication between the presentation and data layers. For the data layer, we utilize SQL Server, which offers robust relational database functionalities that are essential for our product. Furthermore, we leverage Azure for our cloud infrastructure and DevOps, which enables us to maintain a streamlined and automated deployment pipeline. Communication between the layers occurs through HTTP/REST, using JSON for data interchange. We have also integrated Azure Queue to facilitate asynchronous communication and manage heavy workloads. The entire application is containerized with Docker and orchestrated by Kubernetes.