Paytm Software Engineer interview: DSA, wallet design, and Java

After speaking with a recruiter, I had a medium-difficulty DSA technical screen about a week later. It was a straightforward checkpoint where I needed to communicate my reasoning before, during, and after coding. The next round was harder. I received a medium-to-hard tree problem and a system-design prompt about Paytm Wallet, so I had to move from an algorithm into design trade-offs. The last tec…

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