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MERN Stack Developer

Borderfree
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4 rounds | 5 Coding problems

Interview preparation journey

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Preparation
Duration: 6 months
Topics: Data structures, OOPS , Algorithm , Dynamic programming , Operating system
Tip
Tip

Tip 1 : Practice Atleast 300 Questions
Tip 2 : Practice different approaches to solve a particular problem
Tip 3 : Do Atleast 2 projects

Application process
Where: Campus
Eligibility: No criteria
Resume Tip
Resume tip

Tip 1 : Have some Projects on resume
Tip 2 : Do not put false things on resume

Interview rounds

01
Round
Medium
Assignment
Duration90 minutes
Interview date26 Aug 2021
Coding problem2

1. Assignment

Develop an e-commerce page with the product image on the left and product info on the right (reference here). Product info should come from Dynamo DB. When the user clicks on Add to bag, record the choice in DB. When user clicks on proceed to the bag show the summary page.

2. Technical Questions

1. Write a lambda(X) to read the given data from S3: input/dump.json, modify the dateRep to a random date and dump the file onto another s3 folder -- ouput/yyyy-mm-dd/uuid.json (year-month-date of dateRep. Uuid is a universally uniq number) every 1minutes (use cloudwatch to trigger the lambda X.
2. When dumping into the folder check if there is an existing file already. If yes and if the existing file size is less than 10MB then append the new data into the file, else create a new file. The output file to have one json per line.
3. Run AWS Glue and generate schema. Have a lambda (Y) which runs Athena query and converts all of the JSON data (output/*) into ORC files (Using CTAS query).
4. Write lambda (Z) which exposes reset api. On rest api call run the SQL and return the response.
5. Write reactjs app which sends rest api calls every 1minute and plots the graph using react google charts 


 

02
Round
Medium
Video Call
Duration60 Minutes
Interview date31 Aug 2021
Coding problem1

1. Move Zeroes To End

Moderate
30m average time
70% success
0/80
Asked in companies
AmazonSAP LabsMicrosoft

Given an unsorted array of integers, you have to move the array elements in a way such that all the zeroes are transferred to the end, and all the non-zero elements are moved to the front. The non-zero elements must be ordered in their order of appearance.

For example, if the input array is: [0, 1, -2, 3, 4, 0, 5, -27, 9, 0], then the output array must be:

[1, -2, 3, 4, 5, -27, 9, 0, 0, 0].

Expected Complexity: Try doing it in O(n) time complexity and O(1) space complexity. Here, ‘n’ is the size of the array.

Try solving now
03
Round
Hard
Video Call
Duration45 Minutes
Interview date1 Sep 2021
Coding problem1

1. Decode Ways

Moderate
15m average time
85% success
0/80
Asked in companies
UberAdobeCisco

Given a string ‘strNum’ which represents a number, your task is to find the ways to decode the given string ‘strNum’.

The format of encoding is as follows: ‘A’ - 1, ‘B’ - 2, ‘C’ - 3, ‘D’ - 4, ……………, ‘Z’ - 26.

Encoding is possible in letters from ‘A’ to ‘Z’. There is an encoding between character and number.

Example :

subsequence

‘n = 226’ so we can decode ‘226’ in such a way-

‘BZ = 2-26’, as B maps to 2 and Z maps to 26.

‘BBF = 2-2-6’

‘VF = 22-6’

‘226; can be decoded in three ‘BZ’, ‘BBF’, ‘VF’ possible ways.

Point to be noticed we can’t decode ‘226’ as ‘226’ because we have no character which can directly map with ‘226’ we can only decode numbers from ‘1’ to ‘26’ only.

Try solving now
04
Round
Easy
HR Round
Duration30 Minutes
Interview date2 Sep 2021
Coding problem1

1. Basic HR Questions

Are you comfortable with relocation?

Why should we hire you?

What are your strengths and weakness?


 

Here's your problem of the day

Solving this problem will increase your chance to get selected in this company

Skill covered: Programming

Which SQL keyword removes duplicate records from a result set?

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