NPCI Full Stack Engineer Interview Experience: core Java, OOP, and a React question

The interview began immediately with an introduction about me, then moved into core Java and OOP fundamentals. I was asked about inheritance and how I would implement it in a small Java program. I needed to explain the code clearly, including what it did and how its pieces worked together. The discussion went deeper into Java-internals topics. I was asked about the diamond problem and how HashMap…

Shared by a candidate · reported Jun 2026. Interview formats change; use it as a guide, not a script.