Architect a distributed Load Balancing Engine
Last updated: August 9, 2025
Quick Overview
Design a distributed load balancing system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
Grafana Labs
August 9, 20252
8
711 solved
Design a distributed load balancing system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
Grafana Labs 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
- 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 you measure the performance of this component in production?
- How would you document this for other engineers?
- How would this design change if the team size doubled?
- What testing strategy would you use for this component?
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Core Design Principles
For designing a distributed Load Balancing Engine at Grafana Labs, the core design principles that apply include:
- Separation of Concerns: Each component of the load balancer should focus on a ...
Architecture
The architecture for the distributed Load Balancing Engine at Grafana Labs will utilize a microservices approach:
- Service Mesh: Implement a service mesh (e.g., Istio or Linkerd) to manage serv...
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