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Lead Backend Developer Interview Questions

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15,498 lead backend developer interview questions shared by candidates

You decided to use a key-value cache. However, 99% of users are requesting the same information, which creates a bottleneck on a single key. How would you design your cache to prevent this key from becoming a point of contention and ensure better scalability?
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Senior Backend Engineer - Golang

Interviewed at Voodoo

4.3★
Dec 9, 2024

You decided to use a key-value cache. However, 99% of users are requesting the same information, which creates a bottleneck on a single key. How would you design your cache to prevent this key from becoming a point of contention and ensure better scalability?

1. How testing of external services or say cloud services are done in the our project? 2, My project involved uploading files to S3. So questions were how large files were handled. Any custom logic in app as well as the cloud features say from S3 was asked 3. How concurrent users were supported say 10000 in my application or how will be handled ? 4. Give a scenario vertical scaling or horizontal scaling will be used ?
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Backend Engineer

Interviewed at Equal Experts

4.6★
Sep 11, 2025

1. How testing of external services or say cloud services are done in the our project? 2, My project involved uploading files to S3. So questions were how large files were handled. Any custom logic in app as well as the cloud features say from S3 was asked 3. How concurrent users were supported say 10000 in my application or how will be handled ? 4. Give a scenario vertical scaling or horizontal scaling will be used ?

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