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Analytical/Technical interview question about Code Optimization for Mid-Level Backend Developer

Describe a time when you optimized a piece of code for better performance.

Backend Developer

Analytical/Technical

Asked at

Amazon

Difficulty :

Medium

Explanation

This question evaluates your ability to identify inefficiencies and improve application performance. Recruiters want to see how you analyze bottlenecks, test solutions, and measure the impact of your changes. A strong answer includes a concrete example, the steps you took, and measurable outcomes. Avoid vague explanations or failing to mention testing and validation.

Answer Example

I optimized a database query in an e-commerce platform that was causing slow page loads. By adding proper indexing and rewriting the query to reduce redundant joins, I reduced query execution time from 5 seconds to under 200 milliseconds. This improvement decreased page load times, increasing customer retention by 15%.

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