Design a Data Pipeline Service
Last updated: November 21, 2025
Quick Overview
Design a real-time data pipeline system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
ServiceNow
November 21, 20251
4
4,755 solved
Design a real-time data pipeline system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
ServiceNow asks this during the Onsite to assess your depth in software engineering. They want to see understanding of design patterns, system architecture, and the trade-offs involved in different technical approaches.
What the Interviewer Expects
- Design a complex system component applying multiple engineering principles
- Reason about system-level trade-offs: performance, reliability, developer experience
- Discuss advanced patterns: event sourcing, CQRS, distributed transactions
- Address cross-cutting concerns: observability, security, backward compatibility
- Demonstrate depth in both theoretical foundations and practical implementation
Key Topics to Cover
How to Approach This
- Apply SOLID principles. Single Responsibility makes code testable, Open/Closed makes it extensible.
- Choose data structures based on access patterns, not familiarity.
- Prefer immutable data and message passing over shared mutable state for concurrency.
- Design APIs with RESTful conventions, versioning, meaningful errors, and pagination from day one.
Possible Follow-up Questions
- What are the security implications of this design?
- How would you document this for other engineers?
- How would you handle backward compatibility?
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Core Design Principles
In designing a real-time data pipeline service for ServiceNow, the core design principles that apply include Separation of Concerns, Single Responsibility Principle, and **Event-Driven Archite...
Architecture
The architecture of the data pipeline service will follow a microservices architecture with an event-driven approach. Key components will include:
- Data Ingestion Service: Utilizes a lo...
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