Question 1

Explain how you gather and define requirements for a complex data platform project.

Accepted Answer

**Situation**: Complex platforms have multiple stakeholders, ambiguous scope.

**Action**: (1) Stakeholder workshops—personas, use cases, success metrics; (2) Data discovery—sources, volume, quality, latency; (3) Gap analysis—current vs. desired; (4) Prioritization—MoSCoW or RICE; (5) PRD—scope, assumptions, acceptance criteria.

**BCG Style**: Align with business strategy; quantify impact. Iterative refinement—prototype early, validate....

Question 2

Describe how to monitor and log errors effectively in a real-time data pipeline.

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

Design a pipeline capable of processing 1TB of data per day.

Accepted Answer

**Section 1 — The Context (The 'Why')**
Processing 1TB/day requires partitioning, parallelism, and cost optimization. The primary challenge is avoiding hotspots, managing storage growth, and completing daily batches within SLA....

Question 4

Discuss trade-offs when designing a batch vs. real-time processing system.

Accepted Answer

**Section 1 — The Context (The 'Why')**
This system design addresses "Discuss trade-offs when designing a batch vs. real-time processing system...." 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 5

Explain how serverless computing impacts modern data architecture.

Accepted Answer

**Section 1 — The Context (The 'Why')**
This system design addresses "Explain how serverless computing impacts modern data architecture...." 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 6

How would you automate a data pipeline deployment using GitHub Actions or another CI/CD tool?

Accepted Answer

**Section 1 — The Context (The 'Why')**
The primary challenge in 'How would you automate a data pipeline deployment using GitHub Actions or another CI/CD tool?' centers on designing for production scale, correctness guarantees, and operational resilience. A naive or underspecified design fails under load: single points of failure cascade, non-idempotent operations cause duplicates on retry, and lack of observability blocks root-cause analysis....

Question 7

How would you design a real-time pipeline for generating daily retail sales reports?

Accepted Answer

**Section 1 — The Context (The 'Why')**
The primary challenge in 'How would you design a real-time pipeline for generating daily retail sales reports?' centers on designing for production scale, correctness guarantees, and operational resilience. A naive or underspecified design fails under load: single points of failure cascade, non-idempotent operations cause duplicates on retry, and lack of observability blocks root-cause analysis....

Question 8

How would you fix a client's failing reporting pipeline suffering from performance bottlenecks?

Accepted Answer

**Section 1 — The Context (The 'Why')**
The primary challenge in 'How would you fix a client's failing reporting pipeline suffering from performance bottlenecks?' centers on designing for production scale, correctness guarantees, and operational resilience. A naive or underspecified design fails under load: single points of failure cascade, non-idempotent operations cause duplicates on retry, and lack of observability blocks root-cause analysis....

BCG System Design Interview Questions

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BCG System Design Interview Questions

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