Full Stack Engineer Interview Questions

Full Stack Engineer Interview Questions

A full-stack engineer is a technical expert in web and software development. They can handle almost every aspect of development, from servers to systems engineering and databases. During an interview, you can expect both technical questions and questions to determine your interpersonal and communication skills.

Top Full Stack Engineer Interview Questions & How to Answer

Question 1

Question #1: Are you working on anything right now?

How to answer
How to answer: Since more coders are always working on something, the interviewer wants to get an idea of how involved you are in coding. Talk about any projects you are currently working on, whether it's for work or something you are doing on your own time.
Question 2

Question #2: How did you select the tools and technologies for your last project?

How to answer
How to answer: The interviewer wants to get an idea of your experience and how you go about working through a project. Explain the details about the process you followed, talk about why you selected the language you used, and mention what tools and technologies you selected. You can also talk about any problems you faced throughout the development and how you overcame them.
Question 3

Question #3: What are the latest trends in full-stack web development?

How to answer
How to answer: Make sure you are up to date on the latest trends in all kinds of web and software development before your interview. Mention a few of the latest developments you are familiar with and how they might apply to the job. You can also talk about how you learned about the new technology.

19,421 full stack engineer interview questions shared by candidates

Algorithm Question: Is the number range "saturated". I put the word saturated in quotes, because their definition is somewhat ambiguous, after prodding the interviewers, the number range can be fully saturated, over-saturated in certain ranges or under-saturated. Input is a list of arraylist of 2 integers (each pair represents a range) Input 1: [2,5 | 0,2 | 10,15 | 6,9] Output: Saturated (logically this is over saturated because number 2 occurs twice but not according to the interviewers, creating additional edge cases for your algorithm) Output for the above is, yes the range is "perfectly" saturated because it accounts for all numbers from 0-15. Trick: interviewers consider even though the number 2, which occurs twice to be ok and not over saturated. Input 2: [3,10 | 0,5 | 50,100] Output: "not saturated" ("over saturated", the overlap is more than one number) Note for above range, it is both over saturated and under saturated, but interviewers don't mention/care about this Input 3: [5,9 | 0,3] Output: not saturated
avatar

Software Engineer/Full Stack Engineer

Interviewed at Justworks

3.2
Jun 23, 2016

Algorithm Question: Is the number range "saturated". I put the word saturated in quotes, because their definition is somewhat ambiguous, after prodding the interviewers, the number range can be fully saturated, over-saturated in certain ranges or under-saturated. Input is a list of arraylist of 2 integers (each pair represents a range) Input 1: [2,5 | 0,2 | 10,15 | 6,9] Output: Saturated (logically this is over saturated because number 2 occurs twice but not according to the interviewers, creating additional edge cases for your algorithm) Output for the above is, yes the range is "perfectly" saturated because it accounts for all numbers from 0-15. Trick: interviewers consider even though the number 2, which occurs twice to be ok and not over saturated. Input 2: [3,10 | 0,5 | 50,100] Output: "not saturated" ("over saturated", the overlap is more than one number) Note for above range, it is both over saturated and under saturated, but interviewers don't mention/care about this Input 3: [5,9 | 0,3] Output: not saturated

1. given a binary tree, return the number of nodes that got value higher or equal to every node in the path from root to that node. 2. given array of integers, return the first and second lowest numbers. you got 2:20 hours to solve it.
avatar

Full Stack Web Developer

Interviewed at Vonage

3.7
Jan 28, 2016

1. given a binary tree, return the number of nodes that got value higher or equal to every node in the path from root to that node. 2. given array of integers, return the first and second lowest numbers. you got 2:20 hours to solve it.

recreating "lodash"-like functions: Implementing some(arr, func) to return TRUE if some elements in the array satisfy the function. Creating a neg(func)(value) function that takes a function and returns a negated version. Using both some() and neg() to implement every(arr, func).
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Senior Full Stack Developer

Interviewed at Wix

4.1
Jan 22, 2025

recreating "lodash"-like functions: Implementing some(arr, func) to return TRUE if some elements in the array satisfy the function. Creating a neg(func)(value) function that takes a function and returns a negated version. Using both some() and neg() to implement every(arr, func).

shopping cart with products and coupons and calculate the net price after applying coupons on products. Coupons can be of different types with certain conditions. 1. N% off that is 10% off for all the individual 2.P% off on next item 3.D% off on Nth item of Type T. sequentially wants to apply all the coupons on the cart and get the Total amount.
avatar

Full Stack Engineer

Interviewed at Cimpress

4
Nov 8, 2021

shopping cart with products and coupons and calculate the net price after applying coupons on products. Coupons can be of different types with certain conditions. 1. N% off that is 10% off for all the individual 2.P% off on next item 3.D% off on Nth item of Type T. sequentially wants to apply all the coupons on the cart and get the Total amount.

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