Backend Developer Interview Questions

9,192 backend developer interview questions shared by candidates

Where does a cache fit in this picture (of a server/application layout) Given unknown number of Transactions coming into your website, how do you derive statistics on the total for the 'last' 30 minute period using constant memory (the answering is bucketing) Draw a java 8 lambda that returns the sum of a collection of objects where total is greater than x ( a ridiculous question, I dont see how this relates to any particular job skill )
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Backend Developer

Interviewed at N26

3.5
Mar 17, 2016

Where does a cache fit in this picture (of a server/application layout) Given unknown number of Transactions coming into your website, how do you derive statistics on the total for the 'last' 30 minute period using constant memory (the answering is bucketing) Draw a java 8 lambda that returns the sum of a collection of objects where total is greater than x ( a ridiculous question, I dont see how this relates to any particular job skill )

-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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