Custom Middleware: Implement custom middleware in your microservices to reject requests that exceed the rate limit and respond with appropriate HTTP status codes (e.g., 429 Too Many Requests). Example: The API Gateway might allow up to 100 requests per minute from a single IP, and
Answer: fter the limit is reached, it responds with a 429 status until the rate limit resets. Data Management in Microservices
What interviewers expect
- A clear definition tied to Microservices in Microservices projects
- Trade-offs (performance, maintainability, security, cost)
- When you would and would not use it in production
Real-world example
In a production Microservices application, teams apply this when handling user-facing features or integration boundaries. For example, you might use it during a sprint where reliability and observability matter—logging metrics, validating edge cases, and documenting the decision in an ADR so future developers understand why the approach was chosen.
How to explain in the interview
- Define the concept in one or two sentences.
- Context — where it fits in Microservices architecture.
- Example — a specific project, bug, or performance win.
- Trade-off — what you gain vs what you sacrifice.
Tip: Practice aloud on Toolliyo mock interview or the Interview Q&A section before your real interview.