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Senior Backend Developer Interview Questions

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1,045 senior backend developer interview questions shared by candidates

- calculator with a string as input such as "5 * 3 -2 *4" and returning the result - validation of a json like data structure describing a state machine with some consistency rules such as "each terminal state in the terminal key/value pair must exist in the states array, terminal states cannot have associated mappings to other states, non terminal states must have mappings to next states with transition names as key and next state as value, ..." - the system design question was about designing an anomaly or fraud detection service working with rules. The rules of the service apply to either one record or to a set of records.
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Senior Backend Developer

Interviewed at Unit21

3.5★
Mar 5, 2022

- calculator with a string as input such as "5 * 3 -2 *4" and returning the result - validation of a json like data structure describing a state machine with some consistency rules such as "each terminal state in the terminal key/value pair must exist in the states array, terminal states cannot have associated mappings to other states, non terminal states must have mappings to next states with transition names as key and next state as value, ..." - the system design question was about designing an anomaly or fraud detection service working with rules. The rules of the service apply to either one record or to a set of records.

1. The screening interview: a JS code with recursion to calculate the mean of an array. They asked about the code output and its BigO notation. 2. Virtual test: three code challenges in JS. a) Create 3 endpoints using Node.js, Express.js, and Sequelize.js. b) Use Node.js to read a file, check if it exists, and read it asynchronously. c) An algorithm using JS to find if a number was in a Singly Linked List. If the number existed, remove it and rearrange the Linked List. 3. Technical interview: JS questions, Node.js questions, SQL questions, and live coding. In the live coding, the questions were an algorithm to check if a number existed in an unsorted binary tree.
avatar

Senior Backend Developer

Interviewed at Howdy

4.6★
Jan 30, 2023

1. The screening interview: a JS code with recursion to calculate the mean of an array. They asked about the code output and its BigO notation. 2. Virtual test: three code challenges in JS. a) Create 3 endpoints using Node.js, Express.js, and Sequelize.js. b) Use Node.js to read a file, check if it exists, and read it asynchronously. c) An algorithm using JS to find if a number was in a Singly Linked List. If the number existed, remove it and rearrange the Linked List. 3. Technical interview: JS questions, Node.js questions, SQL questions, and live coding. In the live coding, the questions were an algorithm to check if a number existed in an unsorted binary tree.

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