General programming questions and behavioral questions
Back End Engineer Interview Questions
1,087 back end engineer interview questions shared by candidates
Past experience on interview. Time and space complexity on technical test.
Python technical questions and ORM, SQL queries
1) Write a URL shortener 2) Concurrency questions: volatile, atomics, thread-safe containers, deadlocks. 3) Design a backend for a new feature in an existing mobile app that issues new cards and tracks delivery.
Questions that measure your ability to solve problems lonely without a mentor
Write Java class for a blocking queue: when the queue is empty and read method is invoked, it is blocked until something is on the queue. When the queue is full and write method is invoked, it is blocked until an entry in the queue is available.
(Algorithmic Round) Implement LRU Cache (Variant). Talk about the pros and cons of using this data structure including time complexity. (Design rounds) How would you create an API? Rest or GRPC? Tell me the structure of the payload? JSON or XML? What are you API Methods? How would you make v1 API compatible with v2 API? (object oriented round) There is a code quality round where you will be given buggy, unstructured, code that calculates price of booking a rental car, and ask you to make it production grade. Think about design patterns. Think about business requirements changing. (Design round) There is a system design round with VP of engineering. Design a system that you can offer to companies which can authorize employees into buildings using badges. How would you scale the system out? You must drive the entire conversation, and talk about justification of your ideas.
Q1: How does the Sync process between mobile app and backend app work? Q2: Solve a graph theory question!
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