Paytm Interview Process 2026 — Rounds, Tips & Questions
6 real Paytm interview questions reported by engineers, with difficulty and round context.
Real Questions Asked at Paytm
Design Paytm's wallet system that supports deposits, withdrawals, peer-to-peer transfers, and merchant payments. Ensure ACID properties for all transfers, discuss optimistic vs pessimistic locking, and explain how you handle a split-brain scenario where two nodes disagree on a wallet balance.
Design Paytm's cashback system. When a user completes a transaction, they may receive cashback based on complex rules (merchant, time, amount, user segment). The cashback is credited to their wallet. Cover: rule engine, deduplication, and fraud prevention.
Design Paytm's KYC (Know Your Customer) pipeline. Users must submit Aadhaar/PAN documents for verification. How do you store documents securely (encrypted at rest), verify them (ML + manual review), and handle status callbacks?
Explain Paytm's mini-app platform architecture. Third-party developers build apps that run inside the Paytm super-app. How do you sandbox them (security), manage their lifecycle, share user identity safely (OAuth), and handle payments on their behalf?
How does Paytm's QR code payment work technically? Explain the difference between static QR (merchant VPA encoded) and dynamic QR (amount pre-filled). What are the security implications of each?
Paytm operates in a highly regulated environment (RBI guidelines). Describe a time when a regulatory requirement forced you to change a technical design. How did you balance compliance with user experience?
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