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Paytm Placement Papers 2025

Overview

This page is a working set of Paytm placement papers from 2025: from student reports questions, the 2025 online assessment pattern, and step-by-step solutions. Use it to see what Paytm actually asked in the latest cycle, how hard the rounds were, and which themes (DSA, system design, aptitude, or role-specific topics) mattered most. Practice the problems below under timed conditions, then cross-check with the interview and preparation guides if you are targeting an upcoming Paytm drive.

Paytm Online Assessment 2025 pattern

Section Questions Time Difficulty
Coding Problems 2-3 60 min Medium-Hard
Debugging 1 30 min Medium

Paytm Placement Papers 2025 - actual questions & solutions

This section contains practice questions styled on Paytm placement papers 2025 (recent-cycle pattern), with worked solutions. Use them as timed sectional drills - from student reports drives vary by college and role, so treat this as a high-signal practice bank, not an official paper dump.

Question 1: check palindrome

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Problem Statement: Return true if the string reads the same forward and backward (ignore case).

Example:

Input: "Level"
Output: true

Solution (Java):

public boolean isPalindrome(String s) {
    s = s.toLowerCase();
    int i = 0, j = s.length() - 1;
    while (i < j) {
        if (s.charAt(i++) != s.charAt(j--)) return false;
    }
    return true;
}

Time Complexity: O(n)
Space Complexity: O(1)

Question 2: detect cycle in linked list

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Problem Statement: Return true if the linked list has a cycle.

Example:

Input: 3→2→0→-4→(back to 2)
Output: true

Solution (Java):

public boolean hasCycle(ListNode head) {
    ListNode slow = head, fast = head;
    while (fast != null && fast.next != null) {
        slow = slow.next;
        fast = fast.next.next;
        if (slow == fast) return true;
    }
    return false;
}

Time Complexity: O(n)
Space Complexity: O(1)

Question 3: maximum subarray sum

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Problem Statement: Find the contiguous subarray with the largest sum.

Example:

Input: [-2, 1, -3, 4, -1, 2, 1, -5, 4]
Output: 6  // [4, -1, 2, 1]

Solution (Java):

public int maxSubArray(int[] nums) {
    int best = nums[0], cur = nums[0];
    for (int i = 1; i < nums.length; i++) {
        cur = Math.max(nums[i], cur + nums[i]);
        best = Math.max(best, cur);
    }
    return best;
}

Time Complexity: O(n)
Space Complexity: O(1)

Question 4: rotate array right by k

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Problem Statement: Rotate the array to the right by k steps.

Example:

Input: [1,2,3,4,5,6,7], k = 3
Output: [5,6,7,1,2,3,4]

Solution (Java):

public void rotate(int[] nums, int k) {
    k %= nums.length;
    reverse(nums, 0, nums.length - 1);
    reverse(nums, 0, k - 1);
    reverse(nums, k, nums.length - 1);
}
void reverse(int[] a, int l, int r) {
    while (l < r) { int t = a[l]; a[l++] = a[r]; a[r--] = t; }
}

Time Complexity: O(n)
Space Complexity: O(1)

Question 5: merge two sorted lists

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Problem Statement: Merge two sorted linked lists and return a new sorted list.

Example:

Input: 1→2→4 , 1→3→4
Output: 1→1→2→3→4→4

Solution (Java):

public ListNode mergeTwoLists(ListNode a, ListNode b) {
    ListNode dummy = new ListNode(0), cur = dummy;
    while (a != null && b != null) {
        if (a.val <= b.val) { cur.next = a; a = a.next; }
        else { cur.next = b; b = b.next; }
        cur = cur.next;
    }
    cur.next = (a != null) ? a : b;
    return dummy.next;
}

Time Complexity: O(n + m)
Space Complexity: O(1)

Question 6: climbing stairs

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Problem Statement: You can climb 1 or 2 steps. How many distinct ways to climb n stairs?

Example:

Input: n = 4
Output: 5

Solution (Java):

public int climbStairs(int n) {
    if (n <= 2) return n;
    int a = 1, b = 2;
    for (int i = 3; i <= n; i++) {
        int c = a + b; a = b; b = c;
    }
    return b;
}

Time Complexity: O(n)
Space Complexity: O(1)

Question 7: reverse a string

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Problem Statement: Given a string, return it reversed.

Example:

Input: "placement"
Output: "tnemecalp"

Solution (Java):

public String reverse(String s) {
    return new StringBuilder(s).reverse().toString();
}

Time Complexity: O(n)
Space Complexity: O(n)

Question 8

Q8: Which data structure uses FIFO order?

Solution:

FIFO = First In First Out → Queue. Stack is LIFO.

Answer: Queue

Question 9

Q9: Which protocol is connection-oriented at the transport layer?

Solution:

TCP is connection-oriented; UDP is connectionless.

Answer: TCP

Question 10

Q10: In OOP, hiding internal details and showing only essential features is called?

Solution:

This is the definition of Encapsulation (often paired with abstraction in interviews).

Answer: Encapsulation

Question 11

Q11: Which normal form removes transitive dependency?

Solution:

1NF: atomic values. 2NF: no partial dependency. 3NF: no transitive dependency.

Answer: 3NF

Expected hiring

  • Total Hires: 200+ freshers
  • SDE-1: 180+ selections

Salary packages

  • SDE-1: ₹16-22 LPA

Key insights from 2025 Paytm Online Assessment

  1. Coding Section is Critical: Must solve 2-3 coding problems correctly to advance
  2. DSA Focus: Strong emphasis on arrays, strings, trees, graphs, and dynamic programming
  3. Time Management: 2-3 problems in 90 minutes requires excellent speed and accuracy
  4. Debugging: Always included - practice debugging skills thoroughly
  5. Fintech Focus: Problems often relate to payment systems, transactions, security
  6. System Design: Asked for SDE-1/2 roles, payment gateway design for fintech roles
  7. Success Rate: Only 10-15% cleared OA and advanced to interviews
  8. Platform: HackerRank or Paytm’s internal platform
  9. Security Emphasis: Increased focus on security-related coding problems

Paytm 2025 interview experiences

Based on recent candidate experiences from 2025 Paytm interviews:

2025 Interview Process:

  1. Online Assessment (90 minutes): 2-3 coding problems + 1 debugging question
  2. Technical Phone Screen (45-60 minutes): Coding problems, algorithm discussions
  3. Onsite Interviews (4-5 rounds, 45-60 minutes each):
  • Coding rounds (2-3): Algorithms, data structures, problem-solving
  • System Design round: Payment systems, fintech architecture for SDE-1+ roles
  • Behavioral round: Problem-solving approach, security mindset, impact

2025 Interview Trends:

  • Increased emphasis on security-related coding problems
  • More focus on payment system design even for SDE-1 roles
  • Enhanced behavioral questions about security mindset and compliance
  • Questions about transaction processing and fraud detection

Common 2025 Interview Topics:

  • Coding: Arrays, strings, trees, graphs, dynamic programming, security algorithms
  • System Design: Payment gateway design, transaction processing, security systems, wallet systems
  • Debugging: Code fixes, logic errors, security vulnerabilities
  • Behavioral: Problem-solving examples, security mindset, impact on business metrics
  • Fintech Knowledge: Payment systems, transaction processing, security best practices, compliance

2025 Interview Questions Examples:

  • Array and string manipulation problems
  • Tree and graph problems
  • Design Paytm’s payment gateway (System Design)
  • Design Paytm’s wallet system (System Design)
  • Security-related coding problems

Success Tips:

  • Strong coding performance is essential - solve problems optimally
  • Practice debugging skills - this section is always included
  • Learn fintech system design - payment gateways, transaction processing, security
  • Prepare examples demonstrating problem-solving and security mindset
  • Practice explaining your thought process clearly
  • Focus on time management - 2-3 problems in 90 minutes
  • Understand payment systems and security best practices in detail

For detailed interview experiences from 2025, visit Paytm Interview Experience page.

Preparation tips for Paytm 2025 pattern

  1. Master Coding Fundamentals: Focus on solving 2-3 coding problems correctly - arrays, strings, trees, graphs
  2. Practice Previous Year Papers: Solve Paytm OA papers from 2020-2025 to understand evolving patterns
  3. Time Management: Practice completing 2-3 coding problems in 60 minutes, debugging in 30 minutes
  4. Debugging Practice: Practice debugging code - identify and fix logic errors, security issues
  5. System Design Mastery: Learn fintech system design - payment gateways, transaction processing for SDE-1+
  6. LeetCode Practice: Solve 200+ LeetCode problems focusing on arrays, strings, trees (medium-hard difficulty)
  7. Fintech Focus: Practice problems related to payment systems and transactions
  8. Security Knowledge: Understand security best practices for payment systems in detail
  9. Mock Tests: Take timed practice tests to improve speed and accuracy
  10. Dynamic Programming: Practice DP problems - frequently asked
  11. Compliance Knowledge: Understand payment system compliance and regulations

Comments & Suggestions

2024 papers

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