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9,196 backend developer interview questions shared by candidates

Describe the mechanism of hashtable. What's the defference between hashtable and hashmap? Why do we use concurrenthashtable? What does kewrord volatile do? Why we use ReentrantReadWriteLock? Why we use distributed Systems? Some methods to synchronize datas in defferent servers. How does hadoop work? Why we need the cache in the proccess of communication with database? How to solve the problems of cache puncture.
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Backend Developer

Interviewed at Huawei Technologies

3.4★
Oct 27, 2021

Describe the mechanism of hashtable. What's the defference between hashtable and hashmap? Why do we use concurrenthashtable? What does kewrord volatile do? Why we use ReentrantReadWriteLock? Why we use distributed Systems? Some methods to synchronize datas in defferent servers. How does hadoop work? Why we need the cache in the proccess of communication with database? How to solve the problems of cache puncture.

Cod assignment: They asked me to create a web server with three math APIs(e.g. Fibonacci, ...) and to log the runtime of APIs, they gave me a review about my code, that the logger that I implemented is not efficient and so simple, but the point is that when I received the code assignment, I asked them about how do they need the logger to be implemented, is it OK to just write a simple custom logger or there are some other expectations that need to be satisfied, and they told me that I can write a custom one
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Senior Python Backend Developer

Interviewed at Klarna

3.1★
Sep 15, 2021

Cod assignment: They asked me to create a web server with three math APIs(e.g. Fibonacci, ...) and to log the runtime of APIs, they gave me a review about my code, that the logger that I implemented is not efficient and so simple, but the point is that when I received the code assignment, I asked them about how do they need the logger to be implemented, is it OK to just write a simple custom logger or there are some other expectations that need to be satisfied, and they told me that I can write a custom one

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