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Ringcentral Campus Recruitment 2024

Ringcentral Interview Experience for SDE-1 (Oncampus)

Eligibility Criteria

• 8.5+ CGPA
• Ciruit Branches
• No backlogs
• Batch of 2025

Qualification Round

This was an online test conducted on HackerRank. The test was of 90 minutes and had 2 sections:

Section 1: MCQs

• This section had 5 MCQs.
• Got questions from Huffman encoding, Hamming code, Time complexity analysis.
• There was a positive score for correct answers and no negative marking for wrong answers.

Section 2: Coding

This section had 2 coding questions: It was Leetcode hard-medium level questions. The set which I got had one graph based question and one Tree based question. My Friends got questions from DP and graphs.

I was able to solve one question completely and the other question partially.

You can find link to similar questions here . This was very similar to the leetcode question 1334. I have a detailed solution for the given question here - Problem 1334 .

Shortlisting

A total of 28 students were selected from online test into the inperson interviews.

Interviews

The interviews were scheduled the very next day. There were 2 rounds of interviews. We were asked to attend in formals along with hardcopy of resume.

1st round was purely technical while 2nd round was techno-managerial.

Round 1

• Here the interviewer was kind and asked me to introduce myself.

• He then asked me to write code on paper for interface for a stack in any language of my choice.

• He then asked me to write code for push, pop, peek and isEmpty functions.

• I was able to write code for that. He then asked me to implement a getMin function which returns the minimum element in the stack in O(1) time.

• This was a question present in Striver SDE Sheet. I had done this question before so I was able to solve it.

• While doing this he asked me to explain the time complexity of the functions I wrote, how polymorphism works in the present code.

• You can find solution to that question over here - Link

• He then asked me about cacheing and different algorithms used there. As I answered them, he asked me to implement LFU Cache.

• He gave me some hints and I was able to write the code for that.

• The next set of questions were from Operating Systems and Computernetworks. He asked me how Interprocess Communication works in OS and how routing and subnetting works in Computer Networks.

• There were also questions about deadlocks and reader-writer problems.

• I answered them and illustrated the usage of semaphores and mutex in solving them.

I got shortlisted for the next round.

Number of students shortlisted for the next round - 13

Round 2

• This round was more of resume based round.
• Interviewer asked me to introduce myself. Then asked me about my projects and internships.
• I explained thoroughly about the projects. He then asked me questions on various error codes in HTTP and asked me to explain how SSL and TLS works. I was able to explain both of them to a good level.
• He then asked two puzzles.
• The first puzzle is about optimization of number races to find winning horses among 25 horses. The problem link is here - Link
• The second puzzle was to find the number of fishes to remove to change the percentage of fishes in a tank.
• This was a fairly easy ratio puzzle. I was able to solve both.
• Then I asked him about the company culture and the work environment. He explained it to me.
• I also asked about what are the learning opportunities in the company. He was excited to answer that.

I cleared this round.

Verdict

5 students were selected for the SDE-1 role. I was one of them. ( Yay :) )

Tips

• Be prepared in fundamentals of Computer Science

  • Operating systems, Computer Networks, DBMS
  • Do good number of DSA problems

• Be very confident. I was able to clear both rounds because I was very comfortable to speak with them.

• You will think you aren’t prepared, but you already are! Just gain some confidence, it is very vital.

• Don’t hesitate to ask doubts to the interviewer, the more you interect, the more your chances are to get selected.

• Keep speaking out your thought process, the interviewer will provide you hints and encourage you to get to the answer.

• Be strng with your resume, stick to the every single ord mentioned in it.

• Always say YES if the interviewer asked you if you had any questions for him. (Do company research beforehand for this. Atleast read the JD.)