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Paytm (One97 Communications Limited) Interview Experience for Experienced SDE - 1, Jun 2021

Posted: 10 Jun 2022

Selected

Interview Rounds

Application Process

Round 1

Round 2

Round 3

Interview Process

Online Coding Interview

Easy

Duration:

60 Minutes

Interview-Date:

4 Jun 2021

Problems:

There were mostly MCQ questions from OOP concepts, DBMS, OS and Computer Networks. One coding problem was also there

DBMS Questions

There were questions regarding SQL queries, ACID properties in DBMS and Normalisation forms specially 3NF and BCNF.

See my Approach

OS Questions

Questions were around
1. memory management
2. paging
3. CPU scheduling (numerical questions) like First come First serve, Round Robin scheduling etc.

See my Approach

Networking Questions

Questions were around
1. TCP vs UDP
2. DNS system
3. SMTP SNMP protocol.

See my Approach

OOPS Questions

Questions were around
1. Java memory management,
2. Garbage collection,
3. a few code snippets asking the output of a code,
4. polymorphism,
5. thread synchronisation - theory as well as 1 code snippet.

See my Approach

Technical Questions

Questions were around
1. unordered map vs map,
2. asymptomatic complexities of a few code snippets,
3. DFS vs BFS in a graph,
4. order of complexity for different sorting techniques like bubble sort merge sort etc.

See my Approach

Diameter Of Binary Tree

You are given a Binary Tree. You are supposed to return the length of the diameter of the tree.

The diameter of a binary tree is the length of the longest path between any two end no...

Try Problem

See my Approach

Preparation

Duration:

1 Month

Topics:

Data structures, Algorithms, System Design, OOP concepts, DBMS, OS

Preparation Tip

Tip 1 : Paytm focused on core CSE concepts. Make sure to revise DBMS, OS and Computer Networks
Tip 2 : Read basics of system design even for SDE-1 round. Though it's not a dedicated interview round but Hiring Manager generally asks questions around the same. So be prepared

Application Process

Where:

Referral

Eligibility:

No criteria

Resume Tip

Tip 1 : Mention only those skills on your resume in which you are confident as there will be questions around the same
Tip 2 : Keep your resume of Max 1 page and include only the information relevant to software developer role.

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