PayPay India Backend Engineer Interview Questions
The questions to prepare for a PayPay India Backend Engineer interview. Questions from real interview reports rank first. Updated daily.
Implement a least commonly used cache with O(1) average get, put, and remove operations using frequency buckets and linked lists.
Simulate PayPay India brand investments, withdrawals, and profit flags using hash-map state aggregation.
Tests real-time collaboration system design and consistency considerations.
Tests system design for PayPay India e-wallet payments and transaction flows.
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Tests knowledge of Java concurrency and map implementations.
Tests knowledge of HTTP semantics relevant to backend development.
Audit PostgreSQL metadata for missing or invalid keys and tables with inefficient sequential-scan patterns.
MercuryExplain how TRUNCATE and DELETE differ in row removal, transaction behavior, and identity handling.
Celebal TechnologiesCCitiusTechOptimize a PostgreSQL aggregation query by filtering early, reducing rows before joins, and returning qualifying active customers.
SofteamSSoftware Medical Informatics
GlassdoorTests your Java runtime knowledge and your understanding of hash-based data structures and complexity trade-offs.
Tests ability to explain engineering decisions and respond to deep follow-ups.