Overview
Paytm interviews emphasise DSA fundamentals, SQL, and backend design with real fintech-flavoured problems.
Most-asked topics
Arrays and stringsSQL & DBMSTrees and graphsDynamic programmingBackend designSystem design fundamentals
How to prepare
- Solid DSA on arrays, strings, trees, graphs, DP.
- SQL: analytics queries, ranking, joins.
- Design: rate limiter, payment gateway, wallet.
Interview Strategy
Expect a mix of DSA, SQL joins/aggregations, and design questions on payment flows and idempotency.
Paytm-style solving tips
Practice SQL joins, group-by, window functions.
Discuss idempotency and retry logic in design.
Master hashing and sliding window.
Pattern Map
Recurring patterns you'll see repeatedly in Paytm rounds. Master these first.
1
Hash map counting2
Sliding window3
BFS/DFS4
DP on sequences5
Two pointer6
SQL window functions| Interview style | DSA + SQL + backend design |
| Top topics | DSA fundamentals, SQL, design |
| Best first practice | Hashing, sliding window, SQL joins |
| Common traps | Weak SQL, ignoring idempotency |
| Prep goal | Correct logic + clean SQL + design reasoning |
Must-Solve Problems
Curated Paytm-style problem set — grouped by topic bucket. All links are free on LeetCode.
Arrays & Strings5
SQL Practice5
Trees & Graphs4
Year-Wise Question Trends
The most trustworthy way to present recency for Paytm is by trend buckets — not fake exact yearly dates.
2026
2026 focus: fintech-oriented SDE drives.
2025
2025 focus: repeat DSA + SQL classics.
Evergreen
Evergreen: rate limiter, wallet, payment flows.
Practice Set & Revision Checklist
Use this checklist for last-mile revision — tick items as you clear them.