System design interviews evaluate your ability to architect scalable, resilient, and high-performance software systems under realistic real-world constraints.
1. Establish Scale Constraints Early
Calculate Read/Write ratios, Requests Per Second (RPS), and storage capacity requirements for 5-year growth before drawing database schemas.
2. Core Architectural Components to Cover
- Load Balancing: Round-robin vs Consistent Hashing for stateless web servers.
- Database Scaling: Read replicas, sharding, and caching layers (Redis/Memcached).
- Asynchronous Processing: Message queues (Kafka/RabbitMQ) for decoupled workflows.
Master High-Level & Low-Level Design
Practice live system design mocks with senior tech leads from tier-1 software companies.
Book System Design Mock