Walmart Senior Software Engineer Interview Questions, Process, and Tips

1.Sum numbers in linked list
2. Maximum sum subarray

Q1. Design and code hashmap.
Ans. 
Implement a hashmap data structure in code.
• Use an array to store key-value pairs

• Implement a hash function to map keys to indices in the array

• Handle collisions using techniques like chaining or open addressing
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Q2. Questions on kafka
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Q1. Design linked in
Ans. 
Design a platform similar to LinkedIn for professional networking.
• Create user profiles with work experience, education, skills, and endorsements.

• Allow users to connect with others, join groups, and follow companies.

• Include features like job postings, messaging, news feed, and recommendations.

• Implement algorithms for personalized content and job suggestions.

• Ensure data privacy and security measures are in place.
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Q1. Linked list implementation with second largest and second smallest
Ans. 
Implement a linked list with methods to find the second largest and second smallest elements.
• Create a linked list class with methods to insert elements, find second largest, and find second smallest.

• Traverse the linked list to find the largest and smallest elements, then find the second largest and second smallest.

• Handle edge cases such as empty list or lists with less than 2 elements.

• Consider using a priority queue to...read more
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Q2. Max Frequency Character in a string
Ans. 
Find the character with the highest frequency in a given string.
• Iterate through the string and count the frequency of each character using a hashmap.

• Track the character with the highest frequency as you iterate.

• Return the character with the highest frequency at the end.
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Q3. Longest common subsequence print
Ans. 
Find and print the longest common subsequence in an array of strings
• Use dynamic programming to find the longest common subsequence

• Iterate through the array of strings to find common characters

• Print the longest common subsequence found
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Q1. Solid design principles
Ans. 
Solid design principles are fundamental guidelines for designing software that is maintainable, scalable, and efficient.
• Follow the SOLID principles (Single Responsibility, Open/Closed, Liskov Substitution, Interface Segregation, Dependency Inversion)

• Use design patterns like Factory, Singleton, Observer, etc. to solve common design problems

• Keep code modular, reusable, and easy to understand

• Separate concerns and avoid ti
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Q2. Snake and Ladder LLD
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Q3. Executor Service
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2 coding questions were asked one on string to remove the nested parantheses and form string.
Second question was- I was given a mapping array and a num array
Mapping - {6,2,0,7,1,8,3,4,5,9}
NUM- {996, 25, 225}
Output- 553, 08, 008}

Q1. Callback method in java and alternatives
Ans. 
Callback method in Java allows passing a function as an argument to another function. Alternatives include using interfaces, lambda expressions, and method references.
• Callback method allows passing a function as an argument to another function

• Alternatives include using interfaces, lambda expressions, and method references

• Example: Using Runnable interface in Java to pass a function as a callback
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Q2. Hashmap vs concurrent hashmap
Ans. 
Hashmap is not thread-safe, while ConcurrentHashMap is thread-safe and allows for concurrent access.
• Hashmap is not thread-safe and can lead to race conditions in a multi-threaded environment.

• ConcurrentHashMap is thread-safe and allows for concurrent access by multiple threads without the need for external synchronization.

• ConcurrentHashMap achieves thread-safety by dividing the map into segments, each of which can be lo...read more
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Q3. Different method to invoke methode with using constructor or variable
Ans. 
You can invoke a method using a constructor by creating an instance of the class and calling the method, or by using a variable that holds a reference to the method.
• Invoke method using constructor: ClassName obj = new ClassName(); obj.methodName();

• Invoke method using variable: ClassName obj = new ClassName(); Runnable r = obj::methodName; r.run();
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Q4. Ask many scenario based questions
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Q1. How can fragments communicate among themselves
Ans. 
Fragments can communicate among themselves using interfaces, shared view models, and activity callbacks.
• Use interfaces to define communication contract between fragments

• Implement the interface in the hosting activity and pass it to the fragments

• Use shared view models to share data between fragments

• Use activity callbacks like onActivityResult() to communicate between fragments
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Find cycle in a linked list