Paytm's coding rounds mix standard data-structures and algorithms with a recurring 'where would you use this?' follow-up that ties the problem back to wallet and payments systems.
In 2026 expect classics like an O(1) insert-delete-getRandom structure, first-duplicate detection over an unbounded transaction stream, and merging K sorted settlement logs into a single time-ordered ledger. The bar is a correct, optimal solution with honest complexity analysis, plus a crisp answer for how the pattern maps to a real payments backend. Have the production framing ready before the interviewer asks.
About Paytm
Listed Indian fintech offering UPI, payments, lending (consumer + merchant), and a payments bank.
Online coding assessment
Technical coding round one on data structures and algorithms
Technical coding round two with harder problems and system framing
Hiring-manager round, then offer discussion
Round 1 (60-90 min)
online assessment with DSA problems.
Round 2 (60 min)
live coding on arrays, hashing, and heap or stream problems.
Round 3 (60 min)
harder coding round with complexity analysis and payments-context follow-ups.
Sourced from 2+ candidate post-mortems. Hit Practice to answer any one with AI voice feedback.