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Back End Developer Interview Questions
821 back end developer interview questions shared by candidates
Explain the following concepts, where are they useful, give examples to each: inheritance vs. containment Unit test MVC Singleton Race condition Mutex DRY TDD
System design for a simple API request, saving data to database, pros and cons of different design decisions.
Open ended conversation about skills and problem solving ability
first interview - 2 questions, 1) function that returns if the a string with parentheses, a.k.a "<>(){}{}sadasd" is in the right logical sense. 2) fix some long broken code. second interview- 1. implement string lexicographical compare function. and two other questions , implement functions for code out put , felt like then and resolve operator overload.
You should implement a simple REST API with Django REST Framework to synchronize remote mobile devices executing Tasks. In your model you should represent the concept of a Customer, where each customer has: - An email address - A password Each customer may posses zero or more Devices, where each device has: - A unique UUID For each customer there is a list of Tasks, where each Task has: - An ID (INTEGER) - A state (INTEGER) Devices can execute Tasks. Devices can only execute tasks belonging to their owner. When a device starts executing a task, it has 2 minutes to complete it. Tasks can be retried an arbitrarily large amount of times. Devices have a mobile connectivity and may go offline at any time (may not be able to call any REST API). The result of an execution of a Task by a Device can be: - Success (in that case the Task is completed) - Failure (the task should be re-executed) - Execution Time Exceeded (the device did not complete in 2 minutes and the task should be re-executed) The same Task can only be executed by one device at a time. One Device can execute at most one Task at a Time. Different Devices can execute different tasks concurrently. Coding Questions - Using Django Rest Framework, define the model that you suggest to use. Feel free to add new fields if you need it to correctly implement the synchronization algorithm - Define the set of possible states of a Task - Add an API method to let a Device retrieve the set of Tasks it may execute - Add an API method to let a Device notify the beginning of the execution of a Task - Add an API method to let a Device notify the result of an execution of a Task - How would you suggest to configure permissions for the previous model (coding is NOT required)?
Which tools does django provide to support backend scaling?
Check for problems with current code and refactor it.
Jons in SQL
Once you have passed all of the rounds, they will ask you many questions to reassure you that this company is growing.
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