Skip to contentSkip to footer

Software Engineer Front End Interview Questions

Salaries
Interviews

13,481 software engineer front end interview questions shared by candidates

1. If I start a startup would I prefer writing unstructured code in two month or clean, efficient, testable code in a year. (Comparing 2 vs 12 months is a totally unrealistic example. Experienced developer would add new features faster when she/he has clean and well designed code base. There will be fewer bugs also. A good code base would never take 6 times longer to develop.) 2. Would I spend time to add a feature to Web app or to migrate it to ES6? 3. Why do some of TransferWise users drop off at the fourth transfer flow process, which is entering billing information? 4. What would I change to make more users to enter their billing information? 5. How would I know that my change improved the statistics if there were 10 more changes?
avatar

Front-end Web Developer

Interviewed at Wise

3.7★
Sep 14, 2015

1. If I start a startup would I prefer writing unstructured code in two month or clean, efficient, testable code in a year. (Comparing 2 vs 12 months is a totally unrealistic example. Experienced developer would add new features faster when she/he has clean and well designed code base. There will be fewer bugs also. A good code base would never take 6 times longer to develop.) 2. Would I spend time to add a feature to Web app or to migrate it to ES6? 3. Why do some of TransferWise users drop off at the fourth transfer flow process, which is entering billing information? 4. What would I change to make more users to enter their billing information? 5. How would I know that my change improved the statistics if there were 10 more changes?

Serialise IDs from a nested tree of items
 const data = [
  { id: 1, items: [{ id: 4, items: [{id: 5}, {id: 6, items: [{id: 8}]}]}]},
  { id: 2, items: [{ id: 7}]},
  { id: 3 },
  { id: 9, items: [{id: 10, items: [{id: 12}]}, {id: 11}] }
];

// Should return [1, 2, 3, 9, 4, 7, 10, 11, 5, 6, 12, 8] 
avatar

Senior Front End Developer

Interviewed at Apple

4.2★
Nov 10, 2017

Serialise IDs from a nested tree of items
 const data = [
  { id: 1, items: [{ id: 4, items: [{id: 5}, {id: 6, items: [{id: 8}]}]}]},
  { id: 2, items: [{ id: 7}]},
  { id: 3 },
  { id: 9, items: [{id: 10, items: [{id: 12}]}, {id: 11}] }
];

// Should return [1, 2, 3, 9, 4, 7, 10, 11, 5, 6, 12, 8] 

Viewing 591 - 600 interview questions

Glassdoor has 13,481 interview questions and reports from Software engineer front end interviews. Prepare for your interview. Get hired. Love your job.