Design a scalable Data Pipeline System
Last updated: December 11, 2025
Quick Overview
Design a scalable data pipeline system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
Microsoft
December 11, 202546
13
629 solved
Design a scalable data pipeline system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
This is a common system design question asked during Technical Screen at Microsoft. The interviewer expects you to demonstrate your ability to design large-scale distributed systems, make well-reasoned trade-offs, and communicate your thought process clearly. Microsoft values engineers who can think about scalability from day one.
What the Interviewer Expects
- Drive the design discussion proactively with minimal interviewer guidance
- Perform detailed capacity estimation and use it to inform design decisions
- Design for global scale with multi-region deployment and data consistency
- Deep dive into 2-3 critical components with implementation-level detail
- Address complex trade-offs: CAP theorem, eventual consistency, conflict resolution
- Discuss operational excellence: deployment strategy, chaos engineering, SLOs/SLIs
- Propose a phased rollout plan from MVP to full-scale system
Key Topics to Cover
How to Approach This
- Start by clarifying functional and non-functional requirements with the interviewer.
- Estimate the scale: QPS, storage, bandwidth. This drives your design decisions.
- Draw a high-level architecture first, then deep dive into 1-2 critical components.
- Discuss trade-offs explicitly (e.g., consistency vs availability, SQL vs NoSQL).
- Address failure scenarios, monitoring, and how the system handles 10x traffic spikes.
Possible Follow-up Questions
- How would you optimize costs as the system scales?
- What monitoring and alerting would you set up on day one?
- How would you handle a region-wide outage?
- How would you implement rate limiting to protect the system?
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Requirements
- Functional Requirements:
- Handle up to 5 million data ingestion requests per second.
- Support both batch and real-time processing of data.
- Provide APIs for data querying and retriev...
Capacity Estimation
To estimate the capacity needed for the data pipeline:
- Requests per Second: Expect up to 5 million requests per second.
- Data Size per Request: Assume an average size of 1 KB per request. -...
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