I recently had the opportunity to interview for the SDE-1 Backend role at PhonePe, and I wanted to share my experience. The interview was conducted by Sahil Malik (LinkedIn).

Round 1 - Technical Interview
The interviewer focused on DSA, System Design, and Backend Fundamentals. Here’s what was covered:

🔹 Problem 1: Sort Colors (Dutch National Flag Algorithm)
🔹 Problem 2: Check if a Number is Palindromic (O(1) space)

Along with coding problems, I was also asked conceptual questions:
✅ HTTP Methods & Difference between POST & PUT
✅ ACID Properties in Databases
✅ Microservices vs Monolithic Architecture
✅ What is Kafka? How does it work & where is it used?

Key Takeaways
📌 Focus on efficient DSA solutions (O(n) or better).
📌 Be prepared for backend system design concepts.
📌 Revise core HTTP, REST APIs, and messaging systems like Kafka.
📌 Understanding database consistency and transactions (ACID) is crucial.

Overall, it was a great learning experience, and I appreciate the opportunity to interview with PhonePe! 🚀