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Know what each company expects
2 HLD rounds, focus on scalability
Typical: “Design YouTube/Gmail”
LP + system design
Typical: “Design Order System”
Product sense + scale
Typical: “Design Instagram/WhatsApp”
Practical cloud design
Typical: “Design Teams/OneDrive”
Streaming + resilience
Typical: “Design Video Pipeline”
Real-time + geo
Typical: “Design Ride Matching”
Privacy-first
Typical: “Design iCloud Sync”
Payments
Typical: “Design Payment Gateway”
Search + booking
Typical: “Design Search Ranking”
Social graph
Typical: “Design Feed/Connections”
Timeline
Typical: “Design Tweet Feed”
Streaming
Typical: “Design Music Recommendation”
E-commerce
Typical: “Design Flash Sale System”
Typical: “Design UPI System”
Delivery
Typical: “Design Order Tracking”