NinjaCart SDE 2 frontend Interview experience

Overview

This document details the interview process for a Software Development Engineer 2 (SDE 2) frontend role. The process included technical assessments covering JavaScript concepts like debouncing, throttling, promises, closures, array manipulation, and React fundamentals, followed by a machine coding round and a hiring manager interview.

Interview Rounds

The interview process consisted of three rounds:

Round 1: Technical Assessment

This round focused on core JavaScript and React concepts. The candidate faced questions on the following topics:

1. Debouncing and Throttling: The candidate was asked to explain the difference between debouncing and throttling and provide practical applications of each.

2. Promises and setTimeout: The candidate had to predict the output of the following JavaScript code:

   console.log(1);
   
   setTimeout(function () {
       console.log(2);
   }, 0);
   
   Promise.resolve()
       .then(function () {
           console.log(3);
       })
       .then(function () {
           console.log(4);
       });
   

3. Closures and setTimeout: The candidate had to predict the output of the following JavaScript code:

   for (var index = 1; index <= 3; index++) {
       setTimeout(function () {
           console.log('after ' + index + ' second(s):' + index);
       }, index * 1000);
   }
   

4. Array Flattening: The candidate was asked to write a function to flatten a nested array. A potential solution was provided.

5. useEffect and useMemo: The candidate was questioned on the usage and application of these React hooks.

Round 2: Machine Coding and Problem Solving

This round involved practical coding exercises.

1. Custom React Tab Component: The candidate was tasked with creating a custom React Tab component. A solution was provided.

2. Promise Retry Function: The candidate was asked to implement a function that retries a promise if it fails.

Round 3: Hiring Manager Round

This round involved a conversational interview with the hiring manager, focusing on the candidate's experience and fit within the company.