🏦 Kotak SDE2 — Round 1 (Bar Raiser) Interview

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1. 💻 DSA — 2 Questions

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1️⃣ Roman to Integer

2️⃣ Remove Duplicates from Sorted Array

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2. 🏗️ LLD — Event Ticket Booking

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Asked to cover:

• 🗄️ DB Schema
• 🧱 Classes & Relationships
• 🔧 Class Methods + Parameters
• 🌐 API Request & Response
• 🎨 Design Patterns applicable
• 🔒 Concurrency / Seat Booking considerations

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3. ⚙️ HLD

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🔐 Distributed Locking

• What is distributed locking?
• How can we achieve it?
• What happens if a lock is held for a long time?
• How do we handle lock expiry?

🔄 Consumer / Duplicate Processing

• How do you handle duplicate processing at consumer end?
• How do you make consumer processing idempotent?

🚦 Backpressure

• What is backpressure?
• What problems can it create?
• How can we resolve/handle it?

💥 Downstream Service Failure

What happens if a downstream service fails?

Discuss handling at:

• 🌐 Service level
• 🚪 API Gateway
• 📤 Producer
• 📨 Event / Consumer level

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🎯 Verdict

✅ Selected