HR called me first to ask about my background, then asked 3 simple technical questions in Android to verify if I have the required qualifications.

Technical interview was scheduled after 2-3 weeks. It was a Hangout interview which lasted for around 50 minutes. They asked about data structures, Core Java concepts, and the Android platform.

The interview went well; I answered most of the questions confidently. They did not get back to me for 15-20 days. I emailed HR and came to know that they are not moving forward with my application.

How does a hash table work? What is its time complexity?

Details of hashCode() and equals() functions in Java.

Questions on multi-threading and synchronization in Java.

Interfaces and abstract classes in Java.

Android Activity Lifecycle, Services, IntentService in detail, etc.