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Ingeniero De Software Backend Interview Questions

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9,117 ingeniero de software backend interview questions shared by candidates

Can you explain the Node.js event loop and how it handles non-blocking I/O? Describe a time you had to optimize a slow database query. What was your approach? How would you design a rate-limiter for an API gateway? How would you ensure data consistency in a microservices architecture? Tell me about a time a project you were on failed. What did you learn? How do you handle error logging and monitoring in a distributed system?

Backend Developer

Interviewed at Keus

4★
Aug 25, 2025

Can you explain the Node.js event loop and how it handles non-blocking I/O? Describe a time you had to optimize a slow database query. What was your approach? How would you design a rate-limiter for an API gateway? How would you ensure data consistency in a microservices architecture? Tell me about a time a project you were on failed. What did you learn? How do you handle error logging and monitoring in a distributed system?

-find the right most element in tree if postorder and inorder is given -how many binary can made with 3 nodes - 5 -binary search questn -optional keyword in java 8 , null and absent value -which language in not JVM , groovy -time complexity to find min element in max heap. O(n) -which sort is not react same every time , quicksort -algorithm for the count-distinct problem, approximating the number of distinct elements in a multiset. - HyperLogLog
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Backend Developer

Interviewed at Tact.ai

4.5★
Jul 11, 2019

-find the right most element in tree if postorder and inorder is given -how many binary can made with 3 nodes - 5 -binary search questn -optional keyword in java 8 , null and absent value -which language in not JVM , groovy -time complexity to find min element in max heap. O(n) -which sort is not react same every time , quicksort -algorithm for the count-distinct problem, approximating the number of distinct elements in a multiset. - HyperLogLog

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