SDE - 1 Rooter Sports Technology Pvt Ltd interview experience

Interview rounds

Round

Easy

HR Round

Duration30 minutes

Interview date3 Mar 2022

Coding problem1

This was just a screening round to check my intention and communication skills. They just asked me why was I looking for a job change, and told me a little bit about the profile.
The call was scheduled around 14:00 pm.

1. Basic HR Questions

Why are you looking for a job change?
Are there any problems that you are facing in your current company?

Problem approach

Tip 1 : Keep the answers generic, do not bash or talk ill about your current company as it might create a bad impression.
Tip 2 : Some points that I presented were that I wanted to widen my domain, look for better opportunities, etc.

Round

Easy

Video Call

Duration45 Minutes

Interview date4 Mar 2022

Coding problem2

This round mainly consisted of front-end questions, including JS, React, HTML, CSS, etc.
It was conducted around 16:00.
All I had to do was present my screen and write some code to the problem statement.

1. Web Development

I had to create a form with 4 fields (name, email, age, location), and two buttons, "next" and "prev".By default, the name field would have focus, and the "prev" button would be disabled. Clicking on next would focus on the next field (email) and so on. Once you are focused on the last form field (location), the next button would be disabled.

Problem approach

Step 1 : Create the UI, and make sure that you add the `type="button"` on the buttons in the form so that they don't actually submit the form.
Step 2 : Add refs to the inputs, and add onClick methods on the next and prev button.
Step 3 : Create an array fieldRefs, and add all the refs in the array, and a variable index, where clicking on next would increment it, and clicking on prev would decrement it. Then use the focus() method to focus on the respective field.
Step 4 : Now, clean your code and use React-ish way to write it using useEffect, and pass the index as a dependency.

2. Web Development

The problem was with CSS selectors. They gave me an HTML snippet, and I had to use CSS selectors like attribute selectors, class selectors and :not pseudo class.

Problem approach

Understand the different CSS selectors, pseudo classes, and pseudo elements.

Round

Easy

Video Call

Duration60 minutes

Interview date14 Mar 2022

Coding problem4

His round consisted of multiple easy DSA questions, some frontend questions, and one thought experiment related to design. Again, this round was conducted around 15:00 in the afternoon.

1. Palindromic Rearrangement

Easy

0/40

Asked in companies

Ninja’s Friend came up again with a new challenge to test Ninja’s intelligence. There is a string ‘S’ consisting of ‘N’ small letters. Ninja’s task is to tell whether it is possible to rearrange the string so that it becomes palindromic. Can you help Ninja to solve this problem?

A string is said to be palindrome if it reads the same backward as forward. For example: naman, rotor, etc.

For Example

If N=5 and given string S is “rtoor”, the string can be rearranged as “rotor,” which is palindromic.

Problem approach

Create a new empty string.
Iterate over the letters of the string, and append a new character which is the original character incremented by n characters, but if it exceeds z, then loop over to a.
Return the new string.

Try solving now

2. Data Structure Supporting Insert Delete And GetRandom

Easy

15m average time

85% success

0/40

Asked in companies

Design and implement a data structure which supports the following operations:

insert(X): Inserts an element X in the data structure and returns true if the element was not present, and false otherwise.

remove(X): Removes the element X from the data structure, if present. Returns true if the element was present and false otherwise.

search(X): Search the element X in the data structure. Returns true if the element was present and false otherwise.

getRandom(): Return a random element present in the data structure.

Four types of queries denote these operations:

Type 1: for insert(X) operation.
Type 2: for remove(X) operation.
Type 3: for search(X) operation.
Type 4: for getRandom() operation.

Note:

It is guaranteed that at least one element will be present in the data structure when getRandom() operation is performed.

Follow Up:

Can you implement every operation such that it works in O(1) time?

Try solving now

3. Puzzle

Let's say that some of our clients are complaining that our website is really slow/crashing for them. What could be possible solutions and how would you identify the problems.

Problem approach

Tip 1 : Mention the common solutions like optimizing assets, and bundle size.
Tip 2 : Think out of the box, maybe the problem was faced by people of a certain geographic location, check your load balancers, pods, use CDN, etc.
Tip 3 : Provide some solutions, in case we can't figure out what's happening because we are not able to reproduce the problem, add some analytics and crashlytics like Sentry in the frontend, and enable alerting.

4. Browser Questions

What happens behind the scene when you type a URL in your browser and until the webpage is fully loaded?

Problem approach

Tell everything that happens behind the scenes.
The URL is resolved using DNS.
The corresponding system is searched.
A GET request is sent to the system.
The server accesses the file system, preprocesses the response, and sends the response.
Once the response is received, the browser parses the HTML, creates and loads the DOM, creates and loads the CSSOM, and finally starts executing the JS.

Now, this is a very brief answer, and my actual answer included everything from TCP connection and handshake to caching in DNS, port 80.
You can research on it and be prepared accordingly.

Round

Easy

HR Round

Duration30 minutes

Interview date18 Jun 2022

Coding problem1

This was a call with the CTO. We had a nice conversation about Rooter, how it came into existence, etc.
This was basically a call to see if I would fit in the team and a general personality check.

1. Basic HR Questions

Tell me about yourself
What do you know about the work culture of Rooter?
Which skills you want to gain in the near future?

Problem approach

The best way to clear these rounds are to be well versed in leadership principles. They are really helpful and you can use them for any company's behavioural round.