Senior Backend Engineer Interview Questions

2,043 senior backend engineer interview questions shared by candidates

Please walk us through a significant project or initiative on a major product, where you were in a lead role or a key contributor. Choose an example that you're proud of and that best illustrates your project management abilities.
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Senior Backend Engineer

Interviewed at DuckDuckGo

4.4
Nov 29, 2021

Please walk us through a significant project or initiative on a major product, where you were in a lead role or a key contributor. Choose an example that you're proud of and that best illustrates your project management abilities.

C++ coding assignment Input: 3 files (F1, F2, F3) with synonyms. * Format: `word1=word2 word3=word4` * Separator between pairs: `=` * Separator between synonyms: space `" "` Processing: * Read files in **parallel threads** (1 thread per file). * Merge all synonyms together. * Remove duplicates. Output: * Print groups of synonyms (words that are connected). * Each group printed once. * Words inside each group sorted alphabetically (lowercase). * Provide option to sort ascending/descending.
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Senior Backend Engineer

Interviewed at Varonis Systems

3.9
Aug 26, 2025

C++ coding assignment Input: 3 files (F1, F2, F3) with synonyms. * Format: `word1=word2 word3=word4` * Separator between pairs: `=` * Separator between synonyms: space `" "` Processing: * Read files in **parallel threads** (1 thread per file). * Merge all synonyms together. * Remove duplicates. Output: * Print groups of synonyms (words that are connected). * Each group printed once. * Words inside each group sorted alphabetically (lowercase). * Provide option to sort ascending/descending.

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