How to answer this 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.

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Backend Developer

Analytical/Technical

Asked at

Amazon

Difficulty :

Medium

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A popular meme image featuring the Marvel character Thanos with the caption “A small price to pay for salvation,” commonly used to humorously express acceptance of a minor sacrifice for a greater benefit.

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.

A popular meme image featuring the Marvel character Thanos with the caption “A small price to pay for salvation,” commonly used to humorously express acceptance of a minor sacrifice for a greater benefit.

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%.

How it works?

Perfect applications in one click.

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Step 1:
Create a profile

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A popular meme image featuring the Marvel character Thanos with the caption “A small price to pay for salvation,” commonly used to humorously express acceptance of a minor sacrifice for a greater benefit.

Step 2:
Find a job post

Start searching for jobs anywhere you want and paste the job description in the box in FirstResume.

A popular meme image featuring the Marvel character Thanos with the caption “A small price to pay for salvation,” commonly used to humorously express acceptance of a minor sacrifice for a greater benefit.

Step 3:
One click .. and done

One click, and we will track your job with AI, analyse your compatibility, create your perfect resume and more, ready to apply.

That's it! Give it a go!
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