I worked on the project as a NestJS developer. My main task was to create the server side of the REST-API service. The project team included a front-end developer, three mobile developers, a desktop application developer, a designer, QA, and a project manager. I used PostgreSQL as the database to store the data, and I used TypeORM to interact with it. In addition, it was required to implement real-time data updating, so I chose the socket.io library for communication between the server and clients. To store the data required for subsequent analytical queries, I set up an interaction with Clickhouse. I also integrated third-party services for Email and SMS mailings. The entire infrastructure was deployed in Docker containers. Worked with the codebase using Git.