I recently attended an interview with PayU for a Senior Software Engineer role in Bangalore. The interview process typically consists of 4–5 rounds covering DSA, system design, and backend engineering concepts.

Round 1 – DSA & Backend Fundamentals

The first round focused on:

Data Structures and Algorithms (DSA)

Core Java concepts and basic design patterns

Questions related to Spring Boot

Microservices architecture fundamentals

Interviewers asked conceptual questions and some problem-solving discussions to evaluate understanding of backend development and Java ecosystem.

Round 2 – Low-Level Design (LLD)

In the second round, I was asked to design a transaction processing system with the following components:

A → Web Service Layer
Handles incoming requests and communicates with customers.

B → Credit/Debit Banking Service
Responsible for processing credit and debit transactions securely.

C → Communication/Notification Service
Sends notifications (such as SMS/email) to customers after transaction processing.

My interview journey ended at the system design round, but it was a great learning experience