MapleLabs Senior Software Engineer Interview Questions and Answers

2 Leetcode medium - LRU Cache and sliding window question

Q1. Design Whatsapp
Ans. 
Design a messaging app like Whatsapp
• Implement end-to-end encryption for secure messaging

• Allow users to send text messages, images, videos, and documents

• Include features like group chats, voice and video calls, status updates

• Provide option for users to share their location

• Develop a user-friendly interface with customizable settings
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Q1. Problem solving (coding)
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Q1. Technical discussion
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Q1. HR discussion, pay discussion
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Q1. Most questions were on Java 8 and Collections Framework. Some Questions on Core Java and SQL for Round 1
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Q2. How to Filter from stream.
Ans. 
Filtering from a stream involves selecting specific elements based on certain criteria.
• Use filter() method to create a new stream with elements that pass a given test.

• Provide a Predicate functional interface to filter() method.

• Example: stream.filter(x -> x > 5) will return a new stream with elements greater than 5.
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Q3. Find Top 3 salary for SQL
Ans. 
To find top 3 salaries for SQL, we need to use the ORDER BY and LIMIT clauses in SQL query.
• Use ORDER BY clause to sort the salaries in descending order

• Use LIMIT clause to limit the result to top 3 salaries

• Example: SELECT salary FROM employees ORDER BY salary DESC LIMIT 3
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Q1. HQL, How to write Queries
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Q1. Salary Discussion based on previous job
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Q1. Question around priority queue
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Q2. Decode strings leetcode
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Q1. System design questions scenario based
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Q1. Questions on multidimensional tree
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2 Leetcode Medium questions on hackerrank

Q1. Kadane algorithm based question
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Q2. Leetcode medium
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Q3. Resume based questions
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Q1. Probability question math problem
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Q2. Puzzle to solve
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Q3. AI based question
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Q4. 1 question to solve Leetcode medium
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Medium to hard questions based on arrays, dp

Q1. Quick sort algorithm
Ans. 
Quick sort is a popular sorting algorithm that uses divide and conquer strategy.
• Divides array into smaller sub-arrays based on a pivot element

• Recursively sorts sub-arrays

• Combines sorted sub-arrays to get final sorted array

• Time complexity: O(n log n) on average, O(n^2) worst case

• Example: [3, 6, 8, 10, 1, 2, 1] -> [1, 1, 2, 3, 6, 8, 10]
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Q2. Modified rotate a matrix
Ans. 
Rotate a matrix by 90 degrees in place
• Transpose the matrix

• Reverse each row of the transposed matrix
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Some Objective questions and 1 Coding Questions

Q1. Situation based questions on Coroutines
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Q2. About Project Tech Stack Used and Questions on that
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2 DSA questions Both are from DP

Q1. 2 Questions , 1 is DSA
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Q2. Second question is Puzzle
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