Tell us about your experience integrating systems with external services and APIs.

In my experience integrating Android applications with external services and APIs, I have encountered tasks such as:

• Setting up HTTP clients (e.g., Retrofit) for interacting with RESTful APIs.
• Handling responses and errors, including JSON parsing with Gson or Moshi.
• Implementing authentication, for example, via OAuth or tokens.
• Managing asynchrony with coroutines or RxJava for smooth UX.

Example of using Retrofit to call an API:

interface ApiService {
    @GET("users/{id}")
    suspend fun getUser(@Path("id") userId: String): Response<User>
}

// Call from ViewModel or repository
val response = apiService.getUser("123")
if (response.isSuccessful) {
    val user = response.body()
    // process data
} else {
    // handle error
}

It is also important to consider network error handling and caching to improve application reliability.