How to Prepare for PhonePe Interview 2026 — Complete Guide
Step-by-step preparation guide for PhonePe interviews. Covers what to study, how long to prepare, top resources, and 8 real questions reported by engineers who cleared the PhonePe process.
Step 1 — Understand what PhonePe actually tests
Based on 8 questions reported by engineers, PhonePe focuses on: System Design, Behavioral, Domain, Redis / Expiry.
Step 2 — Study the right topics in order
- System Design — 3 questions. Start here — highest weight in technical rounds.
- Behavioral — 2 questions. Second priority after the first topic.
- Domain — 2 questions. Cover once the first two topics are solid.
- Redis / Expiry — 1 questions. Cover once the first two topics are solid.
Step 3 — Practice with real questions
These are the most upvoted questions engineers report being asked at PhonePe:
Design PhonePe's UPI transaction system to handle 1 billion transactions per day. Cover: request routing to the correct bank, NPCI integration, handling duplicate transactions, consistency vs availability trade-offs, and how you build a reliable audit trail for regulatory compliance.
Design PhonePe's switch - the internal routing layer that forwards UPI requests to the correct bank. It must be highly available (99.999%), handle 50k TPS, and complete each request within 30 seconds (NPCI timeout). Cover: circuit breakers, retries, and bank-specific timeouts.
Explain how PhonePe handles transaction deduplication. A user taps "Pay" twice due to network lag. The same debit must not happen twice. Walk through idempotency at the API level, database level, and bank integration level.
Design PhonePe's merchant settlement system. Thousands of merchants receive daily settlements of their collected payments minus fees. How do you compute net payables, batch into bank transfers, and provide a reconciliation report?
Tell me about a time you had to debug a critical production issue affecting financial transactions. What was your systematic approach, how did you communicate during the incident, and what was the resolution?
Step 4 — Analyse the job description
Paste the exact PhonePe JD into Stepkai's AI tool. It will extract the competencies being tested, score your current readiness, and generate a personalised day-by-day plan targeting your specific gaps — not a generic checklist.
Step 5 — Mock interview
Practice answering PhonePe questions with AI grading. Get instant feedback on depth, correctness, and communication before the real thing.
Start practising →