Design Logging Infrastructure for mobile apps
Last updated: April 18, 2026
Quick Overview
Design a fault-tolerant logging system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
Confluent
April 18, 202641
6
3,952 solved
Design a fault-tolerant logging system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
This fundamentals question from Confluent's Onsite tests whether you can reason about software design at a deep level. The interviewer expects discussion of maintainability, testability, and operational considerations.
What the Interviewer Expects
- Apply engineering principles to a realistic design scenario
- Discuss trade-offs between different approaches with concrete examples
- Demonstrate understanding of testability, maintainability, and extensibility
- Connect theoretical concepts to production engineering practices
- Discuss how the approach scales with team and codebase size
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
- How would this design change if the team size doubled?
- What are the security implications of this design?
- How would you measure the performance of this component in production?
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Solve on CodemiaSample Answer
Core Design Principles
For the logging infrastructure, we will adhere to the CAP theorem, focusing on eventual consistency and high availability. Given the nature of logging, where data can be slightly out-of-da...
Architecture
We will design a microservices architecture leveraging Kafka as the backbone for message streaming. The architecture will include: 1. Mobile Client: Sends logs as JSON payloads via a RESTful API. ...
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