Question 1

Explain the trade-offs between batch and real-time data processing. Provide examples of when each is appropriate.

Accepted Answer

**Why the distinction matters**: Systems are optimized for different access patterns. Batch assumes bounded, complete datasets; streaming assumes unbounded, infinite data. The choice cascades into storage layout, compute model, operational complexity, and cost structure. **Batch**: Designed for high-throughput, bounded processing. Lower cost per record due to amortized compute (e.g., spot instances). Easier to reason about correctness (all-or-nothing). Trade-off: End-to-end latency is O(hours)....

Question 2

Build a banking system architecture from scratch, highlighting critical workflows, scalability, and data management strategies.

Accepted Answer

**Section 1 — The Context (The 'Why')**
This system faces scale and failure challenges at production. A naive approach breaks under load, loses data, or violates compliance. The primary challenge varies by domain: notifications need preference respect; banking needs ACID; pipelines need idempotency....

Question 3

Demonstrate system design principles applied to BI solutions.

Accepted Answer

**Section 1 — The Context (The 'Why')**
This system faces scale and failure challenges at production. A naive approach breaks under load, loses data, or violates compliance. The primary challenge varies by domain: notifications need preference respect; banking needs ACID; pipelines need idempotency....

Question 4

Design a project architecture visually and explain key components.

Accepted Answer

**Section 1 — The Context (The 'Why')**
This system design addresses "Design a project architecture visually and explain key components...." at production scale. The primary challenges are throughput under variable load, fault tolerance across distributed components, and maintaining consistency guarantees that match business requirements. Naive monolithic approaches break when single points of failure emerge, network partitions occur, or backpressure from slow consumers cascades upstream....

Question 5

Discuss the deployment process for real-time applications using CI/CD pipelines.

Accepted Answer

**Section 1 — The Context (The 'Why')**
This system design addresses "Discuss the deployment process for real-time applications using CI/CD pipelines...." at production scale. The primary challenges are throughput under variable load, fault tolerance across distributed components, and maintaining consistency guarantees that match business requirements....

Question 6

Explain project architecture, technical contributions, and value delivered.

Accepted Answer

**Section 1 — The Context (The 'Why')**
This system design addresses "Explain project architecture, technical contributions, and value delivered...." at production scale. The primary challenges are throughput under variable load, fault tolerance across distributed components, and maintaining consistency guarantees that match business requirements....

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Expedia System Design Interview Questions

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