Tell me more about what you did at [organization]? Was this your first job as a backend developer?

At [organization], I was involved in developing and maintaining backend services for Android mobile applications. The main tasks included designing APIs, optimizing database interactions, integrating with external services, and ensuring data security. This was not my first job as a backend developer; previously, I worked at another company where I handled similar tasks but in a more narrow area, such as only developing REST APIs.